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1

INVESTIGATION OF NOVEL ALLOY TiC-Ni-Ni3Al FOR SOLID OXIDE FUEL CELL INTERCONNECT APPLICATIONS  

SciTech Connect (OSTI)

Solid oxide fuel cell interconnect materials must meet stringent requirements. Such interconnects must operate at temperatures approaching 800 C while resisting oxidation and reduction, which can occur from the anode and cathode materials and the operating environment. They also must retain their electrical conductivity under these conditions and possess compatible coefficients of thermal expansion as the anode and cathode. Results are presented in this report for fuel cell interconnect candidate materials currently under investigation based upon nano-size titanium carbide (TiC) powders. The TiC is liquid phase sintered with either nickel (Ni) or nickel-aluminide (Ni{sub 3}Al) in varying concentrations. The oxidation resistance of the submicron grain TiC-metal materials is presented as a function weight change versus time at 700 C and 800 C for varying content of metal/intermetallic in the system. Electrical conductivity at 800 C as a function of time is also presented for TiC-Ni to demonstrate the vitality of these materials for interconnect applications. TGA studies showed that the weight gain was 0.8 mg/cm{sup 2} for TiC(30)-Ni(30wt.%) after 100 hours in wet air at 800 C and the weight gain was calculated to be 0.5205 mg/cm{sup 2} for TiC(30)- Ni(10 wt.%) after 100 hours at 700 C and 100 hours at 800 C. At room temperature the electrical conductivity was measured to be 2444 1/[ohm.cm] for TiC-Ni compositions. The electrical conductivities at 800 C in air was recorded to be 19 1/[ohm.cm] after 125 hours. Two identical samples were supplied to PNNL (Dr. Jeff Stevenson) for ASR testing during the pre-decision period and currently they are being tested there. Fabrication, oxidation resistance and electrical conductivity studies indicate that TiC-Ni-Ni{sub 3}Al ternary appears to be a very important system for the development of interconnect composition for solid oxide fuel cells.

Rasit Koc; Geoffrey Swift; Hua Xie

2005-01-25T23:59:59.000Z

2

Deformation and fracture behavior of composite structured Ti-Nb-Al-Co(-Ni) alloys  

SciTech Connect (OSTI)

Tensile ductility of the Ti-based composites, which consist of a ?-Ti phase surrounded by ultrafine structured intermetallics, is tunable through the control of intermetallics. The two Ti-based alloys studied exhibit similar compressive yield strength (about 1000?MPa) and strain (about 35%–40%) but show a distinct difference in their tensile plasticity. The alloy Ti{sub 71.8}Nb{sub 14.1}Ni{sub 7.4}Al{sub 6.7} fractures at the yield stress while the alloy Ti{sub 71.8}Nb{sub 14.1}Co{sub 7.4}Al{sub 6.7} exhibits about 4.5% of tensile plastic deformation. To clarify the effect of microstructure on the deformation behavior of these alloys, tensile tests were carried out in the scanning electron microscope. It is shown that the distribution as well as the type of intermetallics affects the tensile ductility of the alloys.

Okulov, I. V., E-mail: i.okulov@ifw-dresden.de; Marr, T.; Schultz, L.; Eckert, J. [IFW Dresden, Helmholtzstr. 20, D-01069 Dresden (Germany); Institut für Werkstoffwissenschaft, Technische Universität Dresden, D-01062 Dresden (Germany); Kühn, U. [IFW Dresden, Helmholtzstr. 20, D-01069 Dresden (Germany); Freudenberger, J. [IFW Dresden, Helmholtzstr. 20, D-01069 Dresden (Germany); Institut für Werkstoffwissenschaft, Technische Universität Bergakademie Freiberg, Gustav-Zeuner-Str. 5, D-09599 Freiberg (Germany); Oertel, C.-G.; Skrotzki, W. [Institut für Strukturphysik, Technische Universität Dresden, D-01062 Dresden (Germany)

2014-02-17T23:59:59.000Z

3

Brazing ZrO{sub 2} ceramic to Ti–6Al–4V alloy using NiCrSiB amorphous filler foil: Interfacial microstructure and joint properties  

SciTech Connect (OSTI)

Reliable brazing of ZrO{sub 2} ceramic and Ti–6Al–4V alloy was achieved using NiCrSiB amorphous filler foil. The interfacial microstructure of ZrO{sub 2}/Ti–6Al–4V joints was characterized by scanning electron microscope, energy dispersive spectrometer and micro-focused X-ray diffractometer. The effects of brazing temperature on the interfacial microstructure and joining properties of brazed joints were investigated in detail. Active Ti of Ti–6Al–4V alloy dissolved into molten filler metal and reacted with ZrO{sub 2} ceramic to form a continuous TiO reaction layer, which played an important role in brazing. Various reaction phases including Ti{sub 2}Ni, Ti{sub 5}Si{sub 3} and ?-Ti were formed in brazed joints. With an increasing of brazing temperature, the TiO layer thickened gradually while the Ti{sub 2}Ni amount reduced. Shear test indicated that brazed joints tend to fracture at the interface between ZrO{sub 2} ceramic and brazing seam or Ti{sub 2}Ni intermetallic layer. The maximum average shear strength reached 284.6 MPa when brazed at 1025 °C for 10 min. - Graphical Abstract: Interfacial microstructure of ZrO{sub 2}/TC4 joint brazed using NiCrSiB amorphous filler foil was: ZrO{sub 2}/TiO/Ti{sub 2}Ni + ?-Ti + Ti{sub 5}Si{sub 3}/?-Ti/Widmanstätten structure/TC4. - Highlights: • Brazing of ZrO{sub 2} ceramic and Ti-6Al-4V alloy was achieved. • Interfacial microstructure was TiO/Ti{sub 2}Ni + ? + Ti{sub 5}Si{sub 3}/?/Widmanstätten structure. • The formation of TiO produced the darkening effect of ZrO{sub 2} ceramic. • The highest joining strength of 284.6MPa was obtained.

Cao, J., E-mail: cao_jian@hit.edu.cn [Shandong Provincial Key Laboratory of Special Welding Technology, Harbin Institute of Technology at Weihai, Weihai 264209 (China); State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001 (China); Song, X.G., E-mail: song_xiaoguohit@yahoo.com.cn [Shandong Provincial Key Laboratory of Special Welding Technology, Harbin Institute of Technology at Weihai, Weihai 264209 (China); State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001 (China); Li, C., E-mail: li_chun1989@yahoo.cn [State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001 (China); Zhao, L.Y., E-mail: Zhao_ly@163.com [State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001 (China); Feng, J.C., E-mail: feng_jicai@163.com [Shandong Provincial Key Laboratory of Special Welding Technology, Harbin Institute of Technology at Weihai, Weihai 264209 (China); State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001 (China)

2013-07-15T23:59:59.000Z

4

Nickel Alloy, Corrosion and Heat-Resistant, Sheet, Strip, and Plate 72Ni - 15.5Cr - 0.95Cb(Nb) - 2.5Ti - 0.70Al - 7.0Fe Annealed  

E-Print Network [OSTI]

Nickel Alloy, Corrosion and Heat-Resistant, Sheet, Strip, and Plate 72Ni - 15.5Cr - 0.95Cb(Nb) - 2.5Ti - 0.70Al - 7.0Fe Annealed

SAE Aerospace Standards. London

2012-01-01T23:59:59.000Z

5

In situ NiTi/Nb(Ti) composite  

SciTech Connect (OSTI)

Graphical abstract: - Highlights: • In situ NiTi/Nb(Ti) composites were fabricated. • The transformation temperature was affected by the mixing Ti:Ni atomic ratios. • The NiTi component became micron-scale lamella after forging and rolling. • The composite exhibited high strength and high damping capacity. - Abstract: This paper reports on the creation of a series of in situ NiTi/Nb(Ti) composites with controllable transformation temperatures based on the pseudo-binary hypereutectic transformation of NiTi–Nb system. The composite constituent morphology was controlled by forging and rolling. It is found that the thickness of the NiTi lamella in the composite reached micron level after the hot-forging and cold-rolling. The NiTi/Nb(Ti) composite exhibited high damping capacity as well as high yield strength.

Jiang, Daqiang, E-mail: dq80jiang@126.com; Cui, Lishan; Jiang, Jiang; Zheng, Yanjun

2013-12-15T23:59:59.000Z

6

Effects of thermo-mechanical treatment on the shape memory behavior of NiTi and CoNiAl alloys  

E-Print Network [OSTI]

, high melting temperature and cheap constituents make the alloy advantageous among other shape memory alloys. Although some magnetic properties of this alloy are known, there is no report on basic shape memory characteristics of CoNiAl. In this study...

Karaca, Haluk Ersin

2004-09-30T23:59:59.000Z

7

EFFECTS OF ION IRRADIATION ON Zr52.5Cu17.9Ni14.6Al10Ti5 (BAM-11) BULK METALLIC GLASS  

SciTech Connect (OSTI)

Bulk metallic glasses are intriguing candidates for nuclear applications due to their inherent amorphous structure, but their radiation response is largely unknown due to the relatively recent nature of innovations in bulk metallic glass fabrication. Here, microstructural and mechanical property evaluations have been performed on a Zr52.5Cu17.9Ni14.6Al10Ti5 bulk metallic glass (BAM-11) irradiated with 3 MeV Ni+ ions to 0.1 and 1.0 dpa at room temperature and 200 C. Nanoindentation hardness and Young s modulus both decreased by 6 to 20% in samples irradiated at room temperature, with the sample irradiated to 1.0 dpa experiencing the greatest change in mechanical properties. However, no significant changes in properties were observed in the samples irradiated at 200 C, and transmission electron microscopy showed no visible evidence of radiation damage or crystallization following ion irradiation at any of the tested conditions. These results suggest that BAM-11 bulk metallic glass may be useful for certain applications in nuclear environments.

Perez-Bergquist, Alex G [ORNL] [ORNL; Bei, Hongbin [ORNL] [ORNL; Leonard, Keith J [ORNL] [ORNL; Zhang, Yanwen [ORNL] [ORNL; Zinkle, Steven J [ORNL] [ORNL

2014-01-01T23:59:59.000Z

8

Microstructural Characterization and Shape Memory Response of Ni-Rich NiTiHf and NiTiZr High Temperature Shape Memory Alloys  

E-Print Network [OSTI]

NiTiHf and NiTiZr high temperature shape memory alloys (HTSMAs) have drawn a great deal of attention as cheaper alternatives to Pt, Pd and Au alloyed NiTi-based HTSMAs while NiTiZr alloys also providing at least 20% weight reduction then its Ni...

Evirgen, Alper

2014-08-14T23:59:59.000Z

9

Micro artificial muscle fiber using NiTi spring for soft robotics Sangbae Kim, Elliot Hawkes, Kyujin Cho, Matthew Jolda, Joe Foley and Robert Wood  

E-Print Network [OSTI]

from shape memory alloy (NiTi) coiled springs. An enhanced spring NiTi model describes the combination of micro-coil spring, we present a novel mesh-worm prototype that utilizes bio-inspired antagonistic structure alteration, NiTi can be restructured into coil springs. Chang et al.[1], discuss the numerous

Wood, Robert

10

Structure and Electrochemistry of LiNi1/3Co1/3-yMyMn1/3O2 (M=Ti, Al, Fe) Positive Electrode Materials  

SciTech Connect (OSTI)

A series of materials based on the LiNi1/3Co1/3-yMyMn1/3O2 (M = Ti,Al,Fe) system has been synthesized and examined structurally and electrochemically. It is found that the changes in electrochemical performance depend highly on the nature of the substituting atom and its effect on the crystal structure. Substitution with small amounts of Ti4+ (y = 1/12) leads to the formation of a high-capacity and high-rate positive electrode material. Iron substituted materials suffer from an increased antisite defect concentration and exhibit lower capacities and poor rate capabilities. Single-phase materials are found for LiNi1/3Co1/3-yAlyMn1/3O2 when y<_ 1/4 and all exhibit decreased capacities when cycled to 4.3 V. However, an increase in rate performance and cycle stability upon aluminum substitution is correlated with an improved lamellar structure.

Wilcox, James; Patoux, Sebastien; Doeff, Marca

2009-01-14T23:59:59.000Z

11

TiNi shape memory alloy thin films for microactuator application  

E-Print Network [OSTI]

TiNi films were prepared by co-sputtering TiNi target and a separate Ti target. Crystalline structure and phase transformation behaviors of TiNi films were investigated. Results showed that TiNi films had fine grain size ...

Fu, Yongqing

12

Transformation Induced Fatigue of Ni-Rich NiTi Shape Memory Alloy Actuators  

E-Print Network [OSTI]

In this work the transformation induced fatigue of Ni-rich NiTi shape memory alloys (SMAs) was investigated. The aerospace industry is currently considering implementing SMA actuators into new applications. However, before any new applications can...

Schick, Justin Ryan

2011-02-22T23:59:59.000Z

13

Ni{sub 3}Al aluminide alloys  

SciTech Connect (OSTI)

This paper provides a brief review of the recent progress in research and development of Ni{sub 3}Al and its alloys. Emphasis has been placed on understanding low ductility and brittle fracture of Ni{sub 3}Al alloys at ambient and elevated temperatures. Recent studies have resulted in identifying both intrinsic and extrinsic factors governing the fracture behavior of Ni{sub 3}Al alloys. Parallel efforts on alloy design using physical metallurgy principles have led to properties for structural use. Industrial interest in these alloys is high, and examples of industrial involvement in processing and utilization of these alloys are briefly mentioned.

Liu, C.T.

1993-10-01T23:59:59.000Z

14

Thermal diffusion in Ni/Al multilayer  

SciTech Connect (OSTI)

Two Ni/Al multilayers deposited by ion beam sputtering of nominal design [Ni(200A)/Al(100A)] Multiplication-Sign 5 and [Ni(50A)/Al(227A)] Multiplication-Sign 5 on Si substrates were annealed at 200 Degree-Sign C. As-deposited and annealed samples were characterized by x-ray diffraction (XRD) and x-ray reflectometry (XRR). The effort was to study the path of alloying in the above two multilayers of same elements but of opposite stoichiometric ratio. We find distinct differences in alloying of these samples.

Swain, M.; Bhattacharya, D.; Singh, S.; Basu, S. [Solid State Physics Division, Bhabha Atomic Research Center, Mumbai 400085 (India); Gupta, M. [UGC-DAE-Consortium for Scientific Research, University Campus, Khandwa Road, Indore 452017 (India)

2013-02-05T23:59:59.000Z

15

al ni shape: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

NiAl NANOLAMINATES . Open Access Theses and Dissertations Summary: ??To characterize the self-propagating, high-temperature exothermic alloying reactions of NiAl nanoscaled...

16

Nickel Alloy, Corrosion and Heat-Resistant, Sheet, Strip, and Plate 72Ni - 15.5Cr - 0.95 (Cb (Nb) + Ta) - 2.5Ti - 0.70Al - 7.0Fe Consumable Electrode, Remelted or Vacuum Induction Melted, Solution Heat Treated, Precipitation-Hardenable  

E-Print Network [OSTI]

Nickel Alloy, Corrosion and Heat-Resistant, Sheet, Strip, and Plate 72Ni - 15.5Cr - 0.95 (Cb (Nb) + Ta) - 2.5Ti - 0.70Al - 7.0Fe Consumable Electrode, Remelted or Vacuum Induction Melted, Solution Heat Treated, Precipitation-Hardenable

SAE Aerospace Standards. London

2012-01-01T23:59:59.000Z

17

Ni-Pt Silicide Formation Through Ti Mediating Layers  

SciTech Connect (OSTI)

With Ni1-xPtxSi, the variation in queue time between the final surface cleaning and Ni-Pt deposition represents a significant manufacturability issue. A short queue time is often difficult to maintain, leading to the formation of an oxide layer on the Si substrate prior to Ni-Pt deposition that can affect the formation of Ni1-xPtxSi and its texture. In this manuscript, it will be shown that an extended queue time prior to Ni-Pt deposition leads to morphological changes in the Ni1-xPtxSi formation sequence. A layer of Ti deposited between Ni-Pt and Si reduces the native oxide and may facilitate Ni1-xPtxSi formation. With increasing Ti thickness, the presence of metal-rich phases is gradually reduced and the formation temperature of Ni1-xPtxSi increases, suggesting a direct formation of Ni1-xPtxSi from Ni-Pt. In the presence of an interfacial oxide, an increase in formation temperature is also observed with increasing Ti interlayer thickness. When the Ti layer is sufficiently thick, the phase formation sequence becomes relatively insensitive to the presence of an interfacial oxide or extended queue time.

Besser,P.; Lavoie, C.; Ozcan, A.; Murray, C.; Strane, J.; Wong, K.; Gribelyuk, M.; Wang, Y.; Parks, C.; Jordan-Sweet, J.

2007-01-01T23:59:59.000Z

18

Surface characterization and mechanical property of TiN/Ti-coated NiTi alloy by PIIID  

E-Print Network [OSTI]

significantly reduces the friction coefficient and improves wear resistance of the NiTi alloy. © 2006 Elsevier B prosthesis, heart valve replacement and biosensors [6,7]. TiN surface coating has also been found

Zheng, Yufeng

19

Nanoscale structural heterogeneity in Ni-rich half-Heusler TiNiSn  

SciTech Connect (OSTI)

The structural implications of excess Ni in the TiNiSn half-Heusler compound are examined through a combination of synchrotron x-ray and neutron scattering studies, in conjunction with first principles density functional theory calculations on supercells. Despite the phase diagram suggesting that TiNiSn is a line compound with no solid solution, for small x in TiNi{sub 1+x}Sn there is indeed an appearance—from careful analysis of the scattering—of some solubility, with the excess Ni occupying the interstitial tetrahedral site in the half-Heusler structure. The analysis performed here would point to the excess Ni not being statistically distributed, but rather occurring as coherent nanoclusters. First principles calculations of energetics, carried out using supercells, support a scenario of Ni interstitials clustering, rather than a statistical distribution.

Douglas, Jason E., E-mail: jedouglas@mrl.ucsb.edu; Pollock, Tresa M. [Materials Department, University of California, Santa Barbara, California 93106 (United States); Materials Research Laboratory, University of California, Santa Barbara, California 93106 (United States); Chater, Philip A. [Diamond Light Source, Chilton, Oxfordshire OX11 0DE (United Kingdom); Brown, Craig M. [Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899 (United States); Department of Chemical Engineering, University of Delaware, Newark, Delaware 19716 (United States); Seshadri, Ram [Materials Department, University of California, Santa Barbara, California 93106 (United States); Materials Research Laboratory, University of California, Santa Barbara, California 93106 (United States); Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106 (United States)

2014-10-28T23:59:59.000Z

20

Electronic circuits having NiAl and Ni.sub.3 Al substrates  

DOE Patents [OSTI]

An electronic circuit component having improved mechanical properties and thermal conductivity comprises NiAl and/or Ni.sub.3 Al, upon which an alumina layer is formed prior to applying the conductive elements. Additional layers of copper-aluminum alloy or copper further improve mechanical strength and thermal conductivity.

Deevi, Seetharama C. (Midlothian, VA); Sikka, Vinod K. (Oak Ridge, TN)

1999-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "ni ti al" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


21

Shape memory behavior of ultrafine grained NiTi and TiNiPd shape memory alloys  

E-Print Network [OSTI]

The cyclic instability in shape memory characteristics of NiTi-based shape memory alloys (SMAs), such as transformation temperatures, transformation and irrecoverable strains and transformation hysteresis upon thermal and mechanical cycling limits...

Kockar, Benat

2009-05-15T23:59:59.000Z

22

Metastable phase diagram for Ni-implanted Al and pulse surface melted Al(Ni)  

SciTech Connect (OSTI)

The microstructure of <110> Al implanted with Ni was examined before and after subsequent electron beam pulsed surface melting (65 ns, 1.7 J/cm/sup 2/). Both processes were done with the Al substrate at room temperature. Implantation at several energies (160 to 15 keV) into a given sample produced a nearly constant measured Ni concentration through a approx. 0.1 ..mu..m region below the surface (7). Such samples with concentrations from 8 to 25 at. % Ni were examined, along with a sample with a peak concentration of 32 at. % Ni.

Follstaedt, D.M.; Picraux, S.T.

1984-01-01T23:59:59.000Z

23

The electrochemical behavior of a Ti50Ni47Fe3 shape memory alloy C. Li, Y.F. Zheng  

E-Print Network [OSTI]

University, Beijing 100871, PR China Received 31 July 2005; accepted 28 November 2005 Available online 20 film consisting mainly of a layer of TiO2 which is deemed to be important for all biomaterials. © 2005 the effect of copper on the localized corrosion resistance of Ni­Ti shape memory alloy [6]. Wen et al. have

Zheng, Yufeng

24

Grain boundary compositon in NiAl  

SciTech Connect (OSTI)

The high temperature strength and oxidation resistance of many transition metal aluminides makes these intermetallic materials attractive for high temperature applications. However, these aluminides are generally brittle at low temperatures and this restricts their technological applications. However, these aluminides are generally brittle at low temperatures and this restricts their technological applications. It has been demonstrated that the addition of more than 200 ppm of boron to the L1{sub 2}-ordered Ni{sub 3}Al changes the fracture behavior from intergranular to transgranular and increases the ductility. The B2-ordered NiAl nickel aluminide is particularly attractive because of its low density and high melting temperature. This aluminide also fractures intergranularly at room temperature. However, no improvement in ductility is observed with similar boron additions even though the intergranular fracture is suppressed and there is a significant increase in the yield strength. In this paper, the results of an atom probe field ion microscopy investigation of the compositions of the grain boundaries in undoped and boron-doped NiAl are presented. The suitability of the atom probe field ion microscopy technique for the characterization of boundaries has clearly been demonstrated in many previous investigations including the characterization of boron segregation to grain boundaries and other planar features in Ni{sub 3}Al.

Miller, M.K.; Jayaram, R.; Camus, P.P. (Metals and Ceramics Div., Oak Ridge National Lab., Oak Ridge, TN (US))

1992-02-15T23:59:59.000Z

25

Study of Martensitic Phase transformation in a NiTiCu Thin Film...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Phase transformation in a NiTiCu Thin Film Shape Memory Alloy Using Photoelectron Emission Microscopy. Study of Martensitic Phase transformation in a NiTiCu Thin Film Shape...

26

WELDABILITY OF GRAIN-REFINED Fe-12Ni-0.25Ti STEEL FOR CRYOGENIC APPLICATIONS  

E-Print Network [OSTI]

of the Cryogenic Nickel Steels, WRC Bull, 205, May, 1975.REFINED Fe-12Ni-0.25Ti STEEL FOR CRYOGENIC APPLICATIONS D.E.REFINED Fe-12Ni-0.25Ti STEEL FOR CRYOGENIC APPLICATIONS D.

Morris Jr., J.W.

2013-01-01T23:59:59.000Z

27

Electrochemistry properties of multilayer TiN/Ti coatings on NiTi alloy for cardiac occluder application  

E-Print Network [OSTI]

-elasticity, thermal shape memory, high corrosion and fatigue resistance, make NiTi alloy especially suitableTi alloy is a subject of numerous recent studies to improve the material's corrosion resistance as well,b , D.Y. Zhang e a Center for Biomedical Materials and Tissue Engineering, Academy for Advanced

Zheng, Yufeng

28

UNCORRECTEDPROOF 2 Compression behavior of porous NiTi shape memory alloy  

E-Print Network [OSTI]

Ti by self-propagating 41high temperature synthesis (SHS), and again the porous 42NiTi fabricated. The compression behavior of the 11 porous NiTi was examined with the aim of using it possibly as a high energy for possible application 30 in medical implant devices and as high energy absorp- 31 tion structural material

Taya, Minoru

29

Tribological behavior of NiTi alloy against 52100 steel and WC at elevated temperatures  

SciTech Connect (OSTI)

The dry tribological behavior of a Ti-50.3 at.% Ni alloy at temperatures of 25 deg. C, 50 deg. C and 200 deg. C was studied. The wear tests were performed on a high temperature pin-on-disk tribometer using 52100 steel and tungsten carbide pins. The worn surfaces of the NiTi alloy were examined by scanning electron microscope. The results showed that in the wear tests involving steel pins, the wear rate of the NiTi decreased as the wear testing temperature was increased. However, for the NiTi/WC contact, a reverse trend was observed. There was also a large decrease in the coefficient of friction for the NiTi/steel contact with increasing wear testing temperature. The formation of compact tribological layers could be the main reason for the reduction of the wear rate and coefficient of friction of the NiTi/steel contact at higher wear testing temperatures.

Abedini, M. [School of Metallurgy and Materials Engineering, University of Tehran, Tehran (Iran, Islamic Republic of); Ghasemi, H.M., E-mail: hghasemi@ut.ac.ir [School of Metallurgy and Materials Engineering, University of Tehran, Tehran (Iran, Islamic Republic of); Ahmadabadi, M. Nili [School of Metallurgy and Materials Engineering, University of Tehran, Tehran (Iran, Islamic Republic of)

2010-07-15T23:59:59.000Z

30

Lanthanide Al-Ni base Ericsson cycle magnetic refrigerants  

DOE Patents [OSTI]

A magnetic refrigerant for a magnetic refrigerator using the Ericsson thermodynamic cycle comprises DyAlNi and (Gd{sub 0.54}Er{sub 0.46})AlNi alloys having a relatively constant {Delta}Tmc over a wide temperature range. 16 figs.

Gschneidner, K.A. Jr.; Takeya, Hiroyuki

1995-10-31T23:59:59.000Z

31

Lanthanide Al-Ni base Ericsson cycle magnetic refrigerants  

DOE Patents [OSTI]

A magnetic refrigerant for a magnetic refrigerator using the Ericsson thermodynamic cycle comprises DyAlNi and (Gd.sub.0.54 Er.sub.0.46)AlNi alloys having a relatively constant .DELTA.Tmc over a wide temperature range.

Gschneidner, Jr., Karl A. (Ames, IA); Takeya, Hiroyuki (Ibaraki, JP)

1995-10-31T23:59:59.000Z

32

Effect of Aging Heat Treatments on Ni52Ti48 Shape Memory Alloy  

E-Print Network [OSTI]

Ni-rich NiTi shape memory alloys (SMAs) are capable of attaining a wide range of transformation temperatures depending on the heat treatment conditions and superior thermo-mechanical cycling stability, which are desired for repeated solid...

Akin, Erhan

2011-10-21T23:59:59.000Z

33

A=17Al (1993TI07)  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May JunDatastreamsmmcrcalgovInstrumentsrucLasDelivered‰PNGExperience4AJ01) (See Energy0AJ04) (See93TI07)7AJ02) (See1982AJ01)86AJ04)Al

34

Formation of a Novel Ordered Ni3Al Surface Structure by Codeposition on NiAl(110)  

E-Print Network [OSTI]

The formation of a new type of ordered 2D Ni3Al overlayer by low-temperature codeposition on NiAl(110) is demonstrated by kinetic Monte Carlo simulation of a multisite atomistic lattice-gas model with a precise treatment ...

Han, Yong

35

Stable atomic structure of NiTi austenite  

SciTech Connect (OSTI)

Nitinol (NiTi), the most widely used shape-memory alloy, exhibits an austenite phase that has yet to be identified. The usually assumed austenitic structure is cubic B2, which has imaginary phonon modes, hence it is unstable. We suggest a stable austenitic structure that “on average” has B2 symmetry (observed by x-ray and neutron diffraction), but it exhibits finite atomic displacements from the ideal B2 sites. The proposed structure has a phonon spectrum that agrees with that from neutron scattering, has diffraction spectra in agreement with x-ray diffraction, and has an energy relative to the ground state that agrees with calorimetry data.

Zarkevich, Nikolai A [Ames Laboratory; Johnson, Duane D [Ames Laboratory

2014-08-01T23:59:59.000Z

36

E-Print Network 3.0 - al-ni-co decagonal quasicrystal Sample...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Summary: of decagonal Al-Ni-Co K. Pussi Department of Electrical Engineering, Lappeenranta University of Technology, P... . EARLIER WORK ON d-Al-Ni-Co STRUCTURES Decagonal...

37

The wetting behavior of NiAl and NiPtAl on polycrystalline alumina  

SciTech Connect (OSTI)

In order to understand the beneficial effect of Pt on the adherence of thermally grown alumina scales, sessile drop experiments were performed to study the wetting of poly-crystalline alumina by nickel-aluminum alloys with or without platinum addition where the amount of Pt ranged from 2.4 to 10 at.%. Subsequent interfacial structure was evaluated using atomic force microscopy. Platinum addition enhances the wettability of NiAl alloys on alumina, reduces the oxide/alloy interface energy and increases the interfacial mass transport rates.

Saiz, Eduardo; Gauffier, Antoine; Saiz, Eduardo; Tomsia, Antoni P.; Hou, Peggy Y.

2007-07-01T23:59:59.000Z

38

Reaction synthesis of Ni-Al based particle composite coatings  

SciTech Connect (OSTI)

Electrodeposited metal matrix/metal particle composite (EMMC) coatings were produced with a nickel matrix and aluminum particles. By optimizing the process parameters, coatings were deposited with 20 volume percent aluminum particles. Coating morphology and composition were characterized using light optical microscopy (LOM), scanning electron microscopy (SEM), and electron probe microanalysis (EPMA). Differential thermal analysis (DTA) was employed to study reactive phase formation. The effect of heat treatment on coating phase formation was studied in the temperature range 415 to 1,000 C. Long-time exposure at low temperature results in the formation of several intermetallic phases at the Ni matrix/Al particle interfaces and concentrically around the original Al particles. Upon heating to the 500--600 C range, the aluminum particles react with the nickel matrix to form NiAl islands within the Ni matrix. When exposed to higher temperatures (600--1,000 C), diffusional reaction between NiAl and nickel produces ({gamma})Ni{sub 3}Al. The final equilibrium microstructure consists of blocks of ({gamma}{prime})Ni{sub 3}Al in a {gamma}(Ni) solid solution matrix, with small pores also present. Pore formation is explained based on local density changes during intermetallic phase formation and microstructural development is discussed with reference to reaction synthesis of bulk nickel aluminides.

SUSAN,DONALD F.; MISIOLEK,WOICECK Z.; MARDER,ARNOLD R.

2000-02-11T23:59:59.000Z

39

Biomaterials 24 (2003) 39313939 Corrosion and wear-corrosion behavior of NiTi modified  

E-Print Network [OSTI]

Biomaterials 24 (2003) 3931­3939 Corrosion and wear-corrosion behavior of NiTi modified by plasma Received 10 November 2002; accepted 8 April 2003 Abstract The understanding of corrosion behavior in NiTi such as corrosion resistance, plasma source ion implantation (PSII) technique was employed with oxygen as incident

Crone, Wendy C.

40

Thermomechanical Characterization of a TiPdNi High Temperature SMA under Tension  

E-Print Network [OSTI]

Thermomechanical Characterization of a TiPdNi High Temperature SMA under Tension Parikshith K issues, a nominal composition of Ti50Pd40Ni10 HTSMA was used. The alloy was fabricated using a vacuum arc Electrode Discharge Machining (EDM). A high temperature experimental setup was developed on a load frame

Note: This page contains sample records for the topic "ni ti al" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


41

Site preferences of indium impurity atoms in intermetallics having Al3Ti and Al3Zr crystal structures  

E-Print Network [OSTI]

Site preferences of indium impurity atoms in intermetallics having Al3Ti and Al3Zr crystal-04843 (Metals Program) and Praveen Sinha Fund for Physics Research. L12 DO22 DO23 Cu3Au Al3Ti Al3Zr #12;Outline · Indium was doped in samples of Al3V and Al3Ti (Al3Ti structure) and Al3Zr (Al3Zr structure) by arc

Collins, Gary S.

42

Structural, textural and catalytic properties of Al-, Ti-pillared clays  

SciTech Connect (OSTI)

Al-, Ti- and Zr-pillared clays were characterized and NiMo/Pilc`s were tested in HDS reactions. The combination of activity measurements with Moessbauer Spectroscopy and x-ray microanalysis at microscopical scale give insight in the metal phases migration during pillaring, reaction and regeneration steps. {Alpha}-Fe phase in free Fe{sub 2}O{sub 3} islands predominate together with structural Fe{sup 3+} phase, but during the catalytic reaction Fe{sup 2+} forms. Delamination of the Ti- and Zr-Clay supports, together with high Lewis acidity might enhance their catalytic properties.

Ramos-Galvan, C.E.; Dominguez, J.M.; Sandoval-Robles, G.; Castillo-Mares, A.; Nava E, N.

1996-12-31T23:59:59.000Z

43

Application of cluster-plus-glue-atom model to barrierless Cu–Ni–Ti and Cu–Ni–Ta films  

SciTech Connect (OSTI)

To improve the thermal stability of copper and avoid its diffusion into surrounding dielectrics or interfacial reactions with them, the authors applied the cluster-plus-glue-atom model to investigate barrierless Cu–Ni–M (M?=?Ti or Ta) seed layers. The dissolution of the third element (Ti or Ta) in the Cu lattice with the aid of Ni significantly improved the thermal stability of the Cu seed layer. The appropriate M/Ni (M?=?Ti or Ta) ratio was selected to obtain a low resistivity: the resistivity was as low as 2.5??? cm for the (Ti{sub 1.5/13.5}Ni{sub 12/13.5}){sub 0.3}Cu{sub 99.7} film and 2.8??? cm for the (Ta{sub 1.1/13.1}Ni{sub 12/13.1}){sub 0.4}Cu{sub 99.6} film after annealing at 500?°C for 1?h. After annealing at 500?°C for 40?h, the two films remained stable without forming a Cu{sub 3}Si compound. The authors confirmed that the range of applications of the cluster-plus-glue-atom model could be extended. Therefore, a third element M with negative enthalpies of mixing with both Cu and Ni could be selected, under the premise that the mixing enthalpy of M–Ni is more negative than that of M–Cu.

Li, Xiaona, E-mail: lixiaona@dlut.edu.cn; Ding, Jianxin; Wang, Miao; Dong, Chuang [Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Dalian University of Technology), Ministry of Education, Dalian 116024 (China); Chu, Jinn P. [Department of Materials Science and Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan (China)

2014-11-01T23:59:59.000Z

44

The first principle study of Ni{sub 2}ScGa and Ni{sub 2}TiGa  

SciTech Connect (OSTI)

We computed the electronic structure, elastic moduli, vibrational properties, and Ni{sub 2}TiGa and Ni{sub 2}ScGa alloys in the cubic L2{sub 1} structure. The obtained equilibrium lattice constants of these alloys are in good agreement with available data. In cubic systems, there are three independent elastic constants, namely C{sub 11}, C{sub 12} and C{sub 44}. We calculated elastic constants in L2{sub 1} structure for Ni{sub 2}TiGa and Ni{sub 2}ScGa using the energy-strain method. The electronic band structure, total and partial density of states for these alloys were investigated within density functional theory using the plane-wave pseudopotential method implemented in Quantum-Espresso program package. From band structure, total and projected density of states, we observed metallic characters of these compounds. The electronic calculation indicate that the predominant contributions of the density of states at Fermi level come from the Ni 3d states and Sc 3d states for Ni{sub 2}TiGa, Ni 3d states and Sc 3d states for Ni{sub 2}ScGa. The computed density of states at Fermi energy are 2.22 states/eV Cell for Ni{sub 2}TiGa, 0.76 states/eV Cell for Ni{sub 2}ScGa. The vibrational properties were obtained using a linear response in the framework at the density functional perturbation theory. For the alloys, the results show that the L2{sub 1} phase is unstable since the phonon calculations have imagine modes.

Özduran, Mustafa [Ahi Evran Üniversitesi Fen Edebiyat Fakültesi Fizik Bölümü, K?r?ehir (Turkey); Turgut, Kemal [Yüksek Lisans Ö?rencisi, K?r?ehir (Turkey); Arikan, Nihat [Ahi Evran Üniversitesi E?itim Fakültesi ?lkö?retim Bölümü, K?r?ehir (Turkey); ?yigör, Ahmet; Candan, Abdullah [Ahi Evran Üniversitesi Merkezi Ara?t?rma Laboratuvar?, K?r?ehir (Turkey)

2014-10-06T23:59:59.000Z

45

Surface structure and electrochemical characteristics of Ti-V-Cr bcc-type solid solution alloys sintered with Ni  

SciTech Connect (OSTI)

Ti-V-Cr bcc-type solid solution alloys can absorb a large amount of hydrogen and be applied to active materials of the negative electrode in Ni-MH batteries. However, because of the insolubility of Ni into these alloys, the electrochemical characteristics like discharge capacity and cycle life were poor. In order to increase the discharge capacity of hydrogen absorbing alloy electrodes, Ti-V-Cr bcc-type alloy powders were sintered with Ni in order to form Ni contained surface layer on the alloy surface. As sintering temperature rose up, the surface composition changed from TiNi to Ti{sub 2}Ni. TiNi surface layer showed better electrochemical characteristics. For the Ni adding method, Ni electroless plating was preferred because of good adhesion. As a result of optimized conditions, a discharge capacity of 570 mAh/g and an improvement of cycle life were achieved.

Tsuji, Yoichiro; Yamamoto, Osamu; Matsuda, Hiromu; Toyoguchi, Yoshinori

2000-07-01T23:59:59.000Z

46

TI--CR--AL--O thin film resistors  

DOE Patents [OSTI]

Thin films of Ti--Cr--Al--O are used as a resistor material. The films are rf sputter deposited from ceramic targets using a reactive working gas mixture of Ar and O.sub.2. Resistivity values from 10.sup.4 to 10.sup.10 Ohm-cm have been measured for Ti--Cr--Al--O film <1 .mu.m thick. The film resistivity can be discretely selected through control of the target composition and the deposition parameters. The application of Ti--Cr--Al--O as a thin film resistor has been found to be thermodynamically stable, unlike other metal-oxide films. The Ti--Cr--Al--O film can be used as a vertical or lateral resistor, for example, as a layer beneath a field emission cathode in a flat panel display; or used to control surface emissivity, for example, as a coating on an insulating material such as vertical wall supports in flat panel displays.

Jankowski, Alan F. (Livermore, CA); Schmid, Anthony P. (Solana Beach, CA)

2000-01-01T23:59:59.000Z

47

Microstructure and mechanical properties of Ni sub 3 Al-based alloys reinforced with particulates  

SciTech Connect (OSTI)

Hot-extrusion was used to produce Ni{sub 3}Al-based alloys to which 10 vol % TiN, NbC, HfO{sub 2}, or HfN was added for reinforcement. The TiN, NbC, and HfO{sub 2} particulates produced Ni{sub 3}Al-matrix composites in which no reaction was noted at the particle-matrix interface. However, the addition of HfN resulted in extensive reaction in which the hafnium appeared to diffuse into the matrix. Microstructures of this alloy showed a complex array of phases and voids where the HfN particles are presumed to have been originally. Hot hardness, compression, and compression creep tests were preformed on specimens cut from the extruded bar of each alloy. No significant strengthening was observed for the alloys containing TiN, NbC, or HfO{sub 2}. However the HfN-containing alloy did show significant strengthening in simple compression and compression creep. This presentation will include microstructures and the results of the mechanical properties tests. 26 refs., 5 figs.

McKamey, C.G.; Carmichael, C.A.

1990-01-01T23:59:59.000Z

48

Low Spring Index NiTi Coil Actuators for Use in Active Compression Garments  

E-Print Network [OSTI]

This paper describes the modeling, development, and testing of low spring index nickel titanium (NiTi) coil actuators designed for use in wearable compression garments, and presents a prototype tourniquet system using these ...

Holschuh, Bradley

49

Fabrication of NiTi shape memory alloy from elemental powders by hot isostatic pressing  

E-Print Network [OSTI]

The research involved in this thesis was conducted to develop a procedure for producing cylindrical specimens of NiTi shape memory alloy for mechanical testing from elemental powders by hot isostatic pressing. Powders were mixed to ratios of 50...

McNeese, Matthew Doyle

1997-01-01T23:59:59.000Z

50

Fabrication and characterization of porous NiTi Shape Memory Alloy by elevated pressure sintering  

E-Print Network [OSTI]

have not been adequately developed. Currently, three methods are commonly used for producing porous NiTi SMAs from elemental powders. These methods include conventional sintering, Self-propagating High-temperature Synthesis (SHS), and sintering...

Vandygriff, Eric Layton

2012-06-07T23:59:59.000Z

51

Thermomechanical Cyclic Response of TiNiPd High-Temperature Shape Memory Alloys  

E-Print Network [OSTI]

TiNiPd high-temperature shape memory alloys (HTSMAs) have attracted considerable attention as potential solid-state actuators capable of operating at temperatures up to 500 °C, exhibiting excellent corrosion resistance, adequate ductility levels...

Atli, Kadri

2012-10-19T23:59:59.000Z

52

Eutectic bonding of a Ti sputter coated, carbon aerogel wafer to a Ni foil  

SciTech Connect (OSTI)

The formation of high energy density, storage devices is achievable using composite material systems. Alternate layering of carbon aerogel wafers and Ni foils with rnicroporous separators is a prospective composite for capacitor applications. An inherent problem exists to form a physical bond between Ni and the porous carbon wafer. The bonding process must be limited to temperatures less than 1000{degrees}C, at which point the aerogel begins to degrade. The advantage of a low temperature eutectic in the Ni-Ti alloy system solves this problem. Ti, a carbide former, is readily adherent as a sputter deposited thin film onto the carbon wafer. A vacuum bonding process is then used to join the Ni foil and Ti coating through eutectic phase formation. The parameters required for successfld bonding are described along with a structural characterization of the Ni foil-carbon aerogel wafer interface.

Jankowski, A.F.; Hayes, J.P.; Kanna, R.L.

1994-06-01T23:59:59.000Z

53

Dielectric property of NiTiO{sub 3} doped substituted ortho-chloropolyaniline composites  

SciTech Connect (OSTI)

Ortho-chloropolyaniline (OCP)-NiTiO{sub 3} composites have been synthesized via in-situ polymerization of ortho-chloroaniline with various weight percentages of NiTiO{sub 3.} Fourier Transform Infrared spectroscopic studies of Ortho-chloropolyaniline and its composites indicated the formation of composites as a result of Vander Waal's interaction between OCP and NiTiO{sub 3} particles. Surface morphology of OCP and OCP-NiTiO{sub 3} composites were studied using Scanning Electron Microscope (SEM). The SEM micrographs indicated a modified morphology after the composite formation. Dielectric properties and electric modulus of OCP and OCP-NiTiO{sub 3} composites have been investigated in the frequency range of 50 Hz – 5 MHz. It has been noticed that electrical resistance decreases with increase in weight percentage of NiTiO{sub 3} particles in polymer matrix as well as with applied frequency. The display of semicircular arcs in Cole-Cole plots indicates the formation of series resistor and capacitor in network causing a decrease in the relaxation time and as a result conductivity enhances in these composites. The facile and cost effective synthesis process and excellent dielectric and conductivity response of these materials makes them promising materials for practical applications.

Lakshmi, Mohana; Faisal, Muhammad [Department of Physics, PES Institute of Technology, BSC, Bangalore- 560100 (India)] [Department of Physics, PES Institute of Technology, BSC, Bangalore- 560100 (India); Roy, Aashish S. [Department of Materials Science, Gulbarga University, Gulbarga-585106, Karnataka (India)] [Department of Materials Science, Gulbarga University, Gulbarga-585106, Karnataka (India); Khasim, Syed, E-mail: syed.pes@gmail.com [Department of Physics, PES Institute of Technology, BSC, Bangalore- 560100 (India) [Department of Physics, PES Institute of Technology, BSC, Bangalore- 560100 (India); Department of Physics, University of Tabuk-71491 (Saudi Arabia); Sajjan, K. C. [Department of Physics, Veerashaiva College, Bellary - 583 104, Karnataka (India)] [Department of Physics, Veerashaiva College, Bellary - 583 104, Karnataka (India); Revanasiddappa, M. [Department of Chemistry, PES Institute of Technology, BSC, Bangalore - 560100 (India)] [Department of Chemistry, PES Institute of Technology, BSC, Bangalore - 560100 (India)

2013-11-15T23:59:59.000Z

54

Directional solidification studies in Ni-Al alloys  

SciTech Connect (OSTI)

Three solid phases are involved in the phase equilibria of the intermetallic compound Ni{sub 3}Al near its melting point, {beta}, {gamma}{prime}(Ni{sub 3}Al), and {gamma}. The generally-accepted phase diagram involves a eutectic reaction between {beta}{prime} and {gamma}, but some recent studies agree with an older diagram due to Schramm, which has a eutectic reaction between the {beta} and {gamma}{prime} phases. The phase equilibria near Ni{sub 3}Al compositions was evaluated using quenched directional solidification experiments, that preserve the microstructures tonned at the solidification front, and using diffusion couple experiments. These experiments show that eutectic forms between {beta} and {gamma}{prime} phases, as in the Schramm diagram. Growth and phase transformations of these three phases are also studied in the directional solidification experiments. Microstructure analysis shows that etching of Ni{sub 3}Al({gamma}{prime}) is very sensitive to small composition variations and crystallographic orientation changes. The eutectic solidification study confirms that the equilibrium eutectic is {gamma}{prime}+{beta}, and that the metastable {gamma}+{beta} eutectic might be also produced in this system according to the impurities, solidification rates, and composition variations.

Lee, Je-hyun

1993-05-01T23:59:59.000Z

55

Metallic glass alloys of Zr, Ti, Cu and Ni  

DOE Patents [OSTI]

At least quaternary alloys form metallic glass upon cooling below the glass transition temperature at a rate less than 10.sup.3 K/s. Such alloys comprise titanium from 19 to 41 atomic percent, an early transition metal (ETM) from 4 to 21 atomic percent and copper plus a late transition metal (LTM) from 49 to 64 atomic percent. The ETM comprises zirconium and/or hafnium. The LTM comprises cobalt and/or nickel. The composition is further constrained such that the product of the copper plus LTM times the atomic proportion of LTM relative to the copper is from 2 to 14. The atomic percentage of ETM is less than 10 when the atomic percentage of titanium is as high as 41, and may be as large as 21 when the atomic percentage of titanium is as low as 24. Furthermore, when the total of copper and LTM are low, the amount of LTM present must be further limited. Another group of glass forming alloys has the formula (ETM.sub.1-x Ti.sub.x).sub.a Cu.sub.b (Ni.sub.1-y Co.sub.y).sub.c wherein x is from 0.1 to 0.3, y.cndot.c is from 0 to 18, a is from 47 to 67, b is from 8 to 42, and c is from 4 to 37. This definition of the alloys has additional constraints on the range of copper content, b.

Lin, Xianghong (Pasadena, CA); Peker, Atakan (Pasadena, CA); Johnson, William L. (Pasadena, CA)

1997-01-01T23:59:59.000Z

56

A=20Al, etc. (1998TI06)  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May JunDatastreamsmmcrcalgovInstrumentsrucLasDelivered‰PNGExperience4AJ01) (See95TI07) (See the Isobar Diagram for83AJ01)2072AJ02)98TI06)

57

First-principles investigations of Ni3Al(111) and NiAl(110) surfaces at metal dusting conditions  

SciTech Connect (OSTI)

We investigate the structure and surface composition of the {gamma}{prime}-Ni{sub 3}Al(111) and {beta}-NiAl(110) alloy surfaces at conditions relevant for metal dusting corrosion related to catalytic steam reforming of natural gas. In regular service as protective coatings, nickel-aluminum alloys are protected by an oxide scale, but in case of oxide scale spallation, the alloy surface may be directly exposed to the reactive gas environment and vulnerable to metal dusting. By means of density functional theory and thermochemical calculations for both the Ni{sub 3}Al and NiAl surfaces, the conditions under which CO and OH adsorption is to be expected and under which it is inhibited, are mapped out. Because CO and OH are regarded as precursors for nucleating graphite or oxide on the surfaces, phase diagrams for the surfaces provide a simple description of their stability. Specifically, this study shows how the CO and OH coverages depend on the steam to carbon ratio (S/C) in the gas and thereby provide a ranking of the carbon limits on the different surface phases.

Saadi, Souheil

2011-03-01T23:59:59.000Z

58

[TiII] and [NiII] emission from the strontium filament of eta Carinae  

E-Print Network [OSTI]

We study the nature of the [TiII] and [NiII] emission from the so-called strontium filament found in the ejecta of eta Carinae. To this purpose we employ multilevel models of the TiII and NiII systems which are used to investigate the physical condition of the filament and the excitation mechanisms of the observed lines. For the TiII ion, for which no atomic data was previously available, we carry out ab initio calculations of radiative transition rates and electron impact excitation rate coefficients. It is found that the observed spectrum is consistent with the lines being excited in a mostly neutral region with an electron density of the order of $10^7$ cm$^{-3}$ and a temperature around 6000 K. In analyzing three observations with different slit orientations recorded between March~2000 and November~2001 we find line ratios that change among various observations, in a way consistent with changes of up to an order of magnitude in the strength of the continuum radiation field. These changes result from different samplings of the extended filament, due to the different slit orientations used for each observation, and yield clues on the spatial extent and optical depth of the filament. The observed emission indicates a large Ti/Ni abundance ratio relative to solar abundances. It is suggested that the observed high Ti/Ni ratio in gas is caused by dust-gas fractionation processes and does not reflect the absolute Ti/Ni ratio in the ejecta of \\etacar. We study the condensation chemistry of Ti, Ni and Fe within the filament and suggest that the observed gas phase overabundance of Ti

M. A. Bautista; H. Hartman; T. R. Gull; N. Smith; K. Lodders

2006-06-12T23:59:59.000Z

59

Compton Profile Study of Intermetallic Ti{sub 3}Al  

SciTech Connect (OSTI)

The Compton scattering measurement on intermetallic alloy Ti{sub 3}Al is reported in this work. The measurement is made using 59.54 keV gamma-rays from Am{sup 241} source. Theoretical calculation of Compton profile is also performed employing CRYSTAL code within the framework of density functional theory to compare with the measurement. The theoretical profile of the alloy is also synthesized following the superposition model taking the published Compton profiles of elemental solids from the APW method. The experimental study of charge transfer in the alloys has also been done by performing the experimental Compton profile measurements on Ti and Al following the superposition model and charge transfer from Al to Ti is clearly seen on the alloy formation.

Vyas, V.; Sharma, G. [Department of Physics, Banasthali University, Banasthali-304022 (India); Mishra, M. C.; Sharma, B. K. [Department of Physics, University of Rajasthan, Jaipur-302004 (India); Joshi, K. B. [Department of Physics, University College of Science, M.L.Sukhadia University, Udaipur-313 002 (India)

2011-10-20T23:59:59.000Z

60

Site-Dependent Activity of Atomic Ti Catalysts in Al-Based Hydrogen Storage Materials  

E-Print Network [OSTI]

Site-Dependent Activity of Atomic Ti Catalysts in Al-Based Hydrogen Storage Materials Abdullah Al storage processes. Here we analyze the role of atomic Ti catalysts in the hydrogenation of Al-based hydrogen storage materials. We show that Ti atoms near the Al surface activate gas-phase H2, a key step

Ciobanu, Cristian

Note: This page contains sample records for the topic "ni ti al" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


61

Ni Sorption on Pyrophyllite: Evidence for the Formation of Ni-Al Hydroxide and Its Transformation into Ni-Silicate by Visible,  

E-Print Network [OSTI]

into Ni-Silicate by Visible, Infrared and XANES Spectroscopy and Thermogravimetry A. C. Scheinost, R. G suggest either the formation of layered double hydroxides or of layer silicates. Desorption studies polymerization of SiO causes the formation of 1:1 or 2:1 Ni silicates, where the original Ni-Al hydroxide

Sparks, Donald L.

62

Kinetics of Mixed Ni-Al Precipitate Formation on a Soil Clay Fraction  

E-Print Network [OSTI]

Kinetics of Mixed Ni-Al Precipitate Formation on a Soil Clay Fraction D A R R Y L R . R O B E R Management Laboratory, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland The kinetics of mixed Ni-Al Ni- Al LDH formation. The initial Ni concentration was 3 mM with a solid/solution ratio of 10 g L-1

Sparks, Donald L.

63

Correlation between corrosion performance and surface wettability in ZrTiCuNiBe bulk metallic glasses  

E-Print Network [OSTI]

Correlation between corrosion performance and surface wettability in ZrTiCuNiBe bulk metallic June 2010 The corrosion properties of two Zr-based bulk metallic glass, Zr41Ti14Cu12Ni10Be23 LM1 and Zr potential, LM1b showed superior corrosion resistance to LM1. Under identical sample preparation and testing

Zheng, Yufeng

64

Loading rate dependency of maximum nanoindentation depth in nano-grained NiTi shape memory alloy  

E-Print Network [OSTI]

of loading rate on nanoindentation depth for nano-grained polycrystalline superelastic (SE) NiTi SMA superelastic NiTi polycrystalline sheets were purchased from Memory Applications Inc. (USA). With X temperature (T=23 °C). To avoid plastic deformation under the tip, two spherical diamond tips with radii of R

Sun, Qing-Ping

65

The corrosion behavior and hemocompatibility of TiNi alloys coated with DLC by plasma based ion implantation  

E-Print Network [OSTI]

The corrosion behavior and hemocompatibility of TiNi alloys coated with DLC by plasma based ion characteristics and corrosion resistant property as well as hemocompatibility has been investigated. The results measurement and SEM observation, we found that the uncoated TiNi alloy shows severe pitting corrosion, which

Zheng, Yufeng

66

Characterizations Of Precipitate Phases In a Ti-Ni-Pd Alloy  

SciTech Connect (OSTI)

Precipitates in the Ti46Ni37.5Pd16.5 alloy were investigated by electron diffraction and high-resolution scanning transmission electron microscopy. The phase content and stability were determined at several different temperatures and times. Aging at 400 C for an hour results in a new phase, which is consumed by P-phase at longer aging time. At 450 C, the new phase appears first, and then coexists with P-phase. At 500 C, the entire alloy transformed into the new phase. At 550 C, Ti3(Ni,Pd)4 phase begins to form.

Yang, Fan; Kovarik, Libor; Phillips, Patrick J.; Noebe, Ronald D.; Mills, M. J.

2012-06-01T23:59:59.000Z

67

Thermal stability and oxidation resistance of TiCrAlYO coatings...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

stability and oxidation resistance of TiCrAlYO coatings on SS430 for solid oxide fuel cell interconnect applications. Thermal stability and oxidation resistance of TiCrAlYO...

68

Vacancy-Vacancy Interactions in NiAl Matthew O. Zacate and Gary S. Collins  

E-Print Network [OSTI]

Vacancy-Vacancy Interactions in NiAl Matthew O. Zacate and Gary S. Collins Department of Physics, Washington State University, Pullman, WA 99164, USA Keywords: point defect, vacancy, defect interaction, intermetallic compound, perturbed angular correlation, PAC, NiAl Abstract. Interactions between Ni vacancies

Collins, Gary S.

69

IEEE TRANSACTIONS ON MAGNETICS, VOL. 38, NO. 4, JULY 2002 1803 New Ni5Al3 Underlayer for Longitudinal  

E-Print Network [OSTI]

IEEE TRANSACTIONS ON MAGNETICS, VOL. 38, NO. 4, JULY 2002 1803 New Ni5Al3 Underlayer--We describe a new Ni5Al3 underlayer for high-den- sity longitudinal magnetic recording. The Ni5Al3 underlayer has the FCC derivative Ga3Pt5 structure. The Ni5Al3 (221) plane has good lattice match with the Co

Laughlin, David E.

70

The massive transformation in Ti-Al alloys: mechanistic observations  

SciTech Connect (OSTI)

The massive {alpha}{yields}{gamma}{sub m} transformation, as observed using analytical transmission electron microscopy, in Ti-49Al, Ti-48Al-2Nb-2Mn, Ti-55Al-25Ta and Ti-50Al-20Ta alloys is described. Conventional solution heating and quenching experiments have been combined with the more rapid quenching possible using electron beam melting in order to provide further insight into the early stages of the transformation of these alloys. It is shown that the {gamma} develops first at grain boundaries as lamellae in one of the grains and that these lamellae intersect and spread into the adjacent grain in a massive manner. Consequently, there is no orientation relationship between the massive gamma ({gamma}{sub m}) and the grain being consumed whereas there is the expected relation between the {gamma}{sub m} and the first grain which is inherited from the lamellae. It is further shown that the {gamma}{sub m} grows as an f.c.c. phase after initially growing with the L1{sub 0} structure. Furthermore, it is shown that the massive f.c.c. phase then orders to the L1{sub 0} structure producing APDB-like defects which are actually thin 90{degree} domains separating adjacent domains that have the same orientation yet are out of phase. The advancing {gamma}{sub m} interface tends to facet parallel either to one of its four {l_brace}111{r_brace} planes or to the basal plane in the grain being consumed by impinging on existing {gamma} lamellae. Thin microtwins and {alpha}{sub 2} platelets then form in the {gamma}{sub m} presumably due, respectively, to transformation stresses and supersaturation of the {gamma}{sub m} with titanium for alloys containing {approximately}48% Al; indeed, there is a local depletion in aluminium across the {alpha}{sub 2} platelets as determined using fine probe microanalysis.

Zhang, X.D.; Godfrey, S.; Weaver, M.; Strangwood, M.; Kaufman, M.J.; Loretto, M.H. [Univ. of Birmingham, Edgbaston (United Kingdom). IRC in Materials for High Performance Applications] [Univ. of Birmingham, Edgbaston (United Kingdom). IRC in Materials for High Performance Applications; Threadgill, P. [Univ. of Birmingham, Edgbaston (United Kingdom). IRC in Materials for High Performance Applications] [Univ. of Birmingham, Edgbaston (United Kingdom). IRC in Materials for High Performance Applications; [TWI, Cambridge (United Kingdom)

1996-09-01T23:59:59.000Z

71

Ductile Ni.sub.3 Al alloys as bonding agents for ceramic materials  

DOE Patents [OSTI]

An improved ceramic-metal composite comprising a mixture of a ceramic material with a ductile intermetallic alloy, preferably Ni.sub.3 Al.

Tiegs, Terry N. (Lenoir City, TN); McDonald, Robert R. (Traverse City, MI)

1990-01-01T23:59:59.000Z

72

Oxygen-induced changes in electron-energy-loss spectra for Al, Be and Ni. [Al; Be; Ni  

SciTech Connect (OSTI)

Electron-energy-loss spectroscopy (EELS) data are presented to illustrate line shape changes that occur as a result of oxygen interaction with metal surfaces. The metals were aluminum, beryllium and nickel. Core-level EELS data were taken for excitations from Al(2p), Be(1s), Ni(3p/3s) and O(1s) levels to the conduction band (CB) density of states (DOS) of the materials. The primary beam energies for the spectra were 300, 450, 300, and 1135 eV, respectively. The data are presented in both the (as measured) first-derivative and the integral forms. The integral spectra were corrected for coherent background losses and analyzed for CB DOS information. These spectra were found to be in qualitative agreement with published experimental and theoretical studies of these materials. One peak in the spectra for Al oxide is analyzed for its correlation with excitonic screening of the Al(2p) core hole. Similar evidence for exciton formation is found in the Ni(3p) spectra for Ni oxide. Data are also presented showing oxygen-induced changes in the lower-loss-energy EELS curves that, in the pure metal, are dominated by plasmon-loss and interband-transition signals. Single-scattering loss profiles in the integral form of the data were calculated using a procedure of Tougaard and Chorkendorff [S. Tougaard and I. Chorkendorff, Phys. Rev. B. [bold 35], 6570 (1987)]. For all three oxides these profiles are dominated by a feature with a loss energy of around 20[endash]25 eV. Although this feature has been ascribed by other researchers as due to bulk plasmon losses in the oxide, an alternative explanation is that the feature is simply due to O(2s)-to-CB-level excitations. An even stronger feature is found at 7 eV loss energy for Ni oxide. Speculation is given as to its source. The line shapes in both the core-level and noncore-level spectra can also be used simply as [open quotes]fingerprints[close quotes] of the surface chemistry of the materials. Our data were taken using commercially available surface analysis equipment and serve to complement surface information provided by Auger electron and/or x-ray photoelectron spectroscopy. [copyright] [ital 1999 American Vacuum Society.

Madden, H.H.; Landers, R.; Kleiman, G.G. (Instituto de Fisica Gleb Wataghin, Universidade Estadual de Campinas (UNICAMP), 13081-970 Campinas, Sao Paulo, Brasil); Zehner, D.M. (Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830 (United States))

1999-09-01T23:59:59.000Z

73

Growth and Properties of (001)-oriented Pb(Zr?.??Ti?.??)O?/LaNiO? Films on Si(001) Substrates with TiN Buffer Layers  

E-Print Network [OSTI]

Pulsed laser deposition has been used to grow Pb(Zr?.??Ti?.??)O? (PZT)/LaNiO? (LNO) heterostructures with restricted crystallographic orientations on bare Si(001) and SiO?-coated Si(001) substrates, using TiN buffer layers. ...

Zhu, Tie-Jun

74

Combustion synthesis/quasi-isostatic pressing of TiC0.7NiTi cermets: microstructure and transformation characteristics  

E-Print Network [OSTI]

and objectives Combustion synthesis, also called self-propagating high- temperature synthesis (SHS), is a method, Borovinskaya, Gordopolov, and others [1­3] at the Institute for High-Temperature Synthesis. The subjectCombustion synthesis/quasi-isostatic pressing of TiC0.7­NiTi cermets: microstructure

Meyers, Marc A.

75

Shape memory response and microstructural evolution of a severe plastically deformed high temperature shape memory alloy (NiTiHf)  

E-Print Network [OSTI]

NiTiHf alloys have attracted considerable attention as potential high temperature Shape Memory Alloy (SMA) but the instability in transformation temperatures and significant irrecoverable strain during thermal cycling under constant stress remains a...

Simon, Anish Abraham

2006-04-12T23:59:59.000Z

76

EFFECT OF AGING ON THE PHASE TRANSFORMATION AND MECHANICAL BEHAVIOR OF Ti36Ni49Hf15 HIGH  

E-Print Network [OSTI]

and Engineering, Harbin Institute of Technology, Harbin 150001, People's Republic of China (Received August 19 the microstructure, transformation temperature, mechanical properties and shape memory effects (SMEs) for Ti36Ni49Hf

Zheng, Yufeng

77

High-performance Ni[sub 3]Al synthesized from composite powders  

SciTech Connect (OSTI)

Specimens of Ni[sub 3]Al + B of high density (>99.3 pct RD) and relatively large dimension have been synthesized from composite powders through processes of replacing plating and electroless Ni-B plating on Al powder, sintering, and thermal-mechanical treatment. The uniformly coated Ni layer over fine Al or Ni core particles constituting these coating/core composite powders has advantages such as better resistance to oxidation relative to pure Al powder, a greater green density as a compacted powder than prealloyed powder, the possibility of atomically added B to the material by careful choice of a suitable plating solution, and avoidance of the expensive powder metallurgy (PM) equipment such as a hot isostatic press (HIP), hot press (HP), etc. The final Ni[sub 3]Al + B product is made from Ni-B-Al and Ni-B-Ni mixed composite powders by means of traditional PM processes such as compacting, sintering, rolling, and annealing, and therefore, the dimensions of the product are not constrained by the capacity of an HIP or HP. The properties of Ni[sub 3]Al composite powder metallurgy (CPM) specimens tested at room temperature have been obtained, and comparison with previous reports is conducted. A tensile elongation of about 16 pct at room temperature was attained.

Chiou, W.C.; Hu, C.T. (National Tsing Hua Univ., Hsinchu (Taiwan, Province of China). Dept. of Materials Science and Engineering)

1994-05-01T23:59:59.000Z

78

Interface control of ferroelectricity in LaNiO{sub 3}-BaTiO{sub 3} superlattices  

SciTech Connect (OSTI)

LaNiO{sub 3}-BaTiO{sub 3} superlattices with different types of interfaces are studied from first-principles density-functional theory. It is revealed that the ferroelectricity in the superlattice with (NiO{sub 2}){sup ?}/(BaO){sup 0} interfaces is enhanced from that of the superlattice with (LaO){sup +}/(TiO{sub 2}){sup 0} interfaces. The origin lies at the polar discontinuity at the interface, which makes the holes localized within the (NiO{sub 2}){sup ?}/(BaO){sup 0} interface, but drives a penetration of electrons into BaTiO{sub 3} component near (LaO){sup +}/(TiO{sub 2}){sup 0} interface. Our calculations demonstrate an effective avenue to the robust ferroelectricity in BaTiO{sub 3} ultrathin films.

Wu, Yin-Zhong, E-mail: yzwu@cslg.edu.cn [Jiangsu Laboratory of Advanced Functional Materials and Physics Department, Changshu Institute of Technology, Changshu 215500 (China); School of Mathematics and Physics, Suzhou University of Science and Technology, Suzhou 215009 (China); Lu, Hai-Shuang; Cai, Tian-Yi; Ju, Sheng, E-mail: jusheng@suda.edu.cn [Department of Physics and Jiangsu Key Laboratory of Thin Films, Soochow University, Suzhou 215006 (China)

2014-08-15T23:59:59.000Z

79

Method For Making Electronic Circuits Having Nial And Ni3al Substrates  

DOE Patents [OSTI]

A method for making electronic circuit component having improved mechanical properties and thermal conductivity comprises steps of providing NiAl and/or Ni.sub.3 Al, and forming an alumina layer thereupon prior to applying the conductive elements. Additional layers of copper-aluminum alloy or copper further improve mechanical strength and thermal conductivity.

Deevi, Seetharama C. (Midlothian, VA); Sikka, Vinod K. (Oak Ridge, TN)

2001-01-30T23:59:59.000Z

80

Glass Forming Ability in Pr-(Cu, Ni)-Al Alloys  

E-Print Network [OSTI]

Glass forming ability (GFA) in the Pr-rich Pr-(Cu, Ni)-Al alloys at or near the eutectic points was systematically studied. It was found that the GFA in the pseudo-ternary alloys of Pr-(Cu, Ni)-Al is higher than that of ...

Zhang, Yong

Note: This page contains sample records for the topic "ni ti al" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


81

High Temperature coatings based on {beta}-NiAI  

SciTech Connect (OSTI)

High temperature alloys are reviewed, focusing on current superalloys and their coatings. The synthesis, characerization, and oxidation performance of a NiAl–TiB{sub 2} composite are explained. A novel coating process for Mo–Ni–Al alloys for improved oxidation performance is examined. The cyclic oxidation performance of coated and uncoated Mo–Ni–Al alloys is discussed.

Severs, Kevin

2012-07-10T23:59:59.000Z

82

Synthesis of mesoporous NiO doped TiO{sub 2} submicrosphere via spray hydrolysis  

SciTech Connect (OSTI)

NiO doped TiO{sub 2} submicrosphere have been prepared via spray hydrolysis. The doping concentration has been varied form 2 wt% to 15 wt%. Morphology of the submicrospheres has been investigated using small-angle neutron scattering and scanning electron microscopy. Elemental analysis has been carried out by energy dispersive X-ray analysis which confirms the doping concentrations. The mesopores in submicrospheres possess cylindrical morphology.

Bahadur, J.; Sen, D.; Prakash, J.; Singh, Ripandeep; Paul, B.; Mazumder, S.; Sathiyamoorthy, D. [Solid State Physics Division Bhabha Atomic Research Centre, Mumbai, 400085, India (India); Powder Metallurgy Division Bhabha Atomic Research Centre, Mumbai, 400085 (India); Solid State Physics, Division Bhabha Atomic Research Centre, Mumbai, 400085 (India); Materials Processing Division Bhabha Atomic Research Centre, Mumbai, 400085 (India); Solid State Physics Division Bhabha Atomic Research Centre, Mumbai, 400085 (India); Powder Metallurgy Division Bhabha Atomic Research Centre, Mumbai, 400085 (India)

2012-06-05T23:59:59.000Z

83

Overall photocatalytic water splitting with NiOxSrTiO3 a revised Troy K. Townsend,a  

E-Print Network [OSTI]

catalysts assumes water oxidation to occur at the early transition metal oxide and water reduction at NiOx­La : KTaO3, and many layered perovskites. Introduction Splitting water into hydrogen and oxygen gas usingOverall photocatalytic water splitting with NiOx­SrTiO3 ­ a revised mechanism Troy K. Townsend

Osterloh, Frank

84

Microstructure and magnetoelectric properties in Pb,,ZrxTi1-x...O3Ni composite ferroic films  

E-Print Network [OSTI]

Microstructure and magnetoelectric properties in Pb,,ZrxTi1-x...O3­Ni composite ferroic films 15213 Presented on 31 October 2005; published online 19 April 2006 Ferroic composite thin films composite films grown on SiO2/Si substrates at 650 °C, a perovskite structure was obtained when the Ni

Laughlin, David E.

85

In vitro corrosion and cytotoxicity on microcrystalline, nanocrystalline and amorphous NiTi alloy fabricated by high pressure torsion  

E-Print Network [OSTI]

In vitro corrosion and cytotoxicity on microcrystalline, nanocrystalline and amorphous NiTi alloy Amorphous Metals and alloys Corrosion and ion release Cytotoxicity Bulk nanocrystalline and amorphous Ni50 discs by high pressure torsion (HPT) technique. Then their corrosion resistance, surface wettability

Zheng, Yufeng

86

The characterization of fluorocarbon films on NiTi alloy by magnetron sputtering *, F.T. Zi a  

E-Print Network [OSTI]

The characterization of fluorocarbon films on NiTi alloy by magnetron sputtering L. Li a, *, F the surface properties. Fluorocarbon films find extremely diverse applications because of their favorable reported. In our study, we used PTFE as the target, while the fluorocarbon films were prepared on Ni

Zheng, Yufeng

87

Characteristic losses in metals: Al, Be, and Ni  

SciTech Connect (OSTI)

Information about the {ital occupied} portion of the surface density of states of materials can be derived from electron-excited Auger electron spectroscopy (AES), which is a standard experimental technique in most surface science laboratories. Surface sensitive experimental techniques that provide information regarding the {ital unoccupied} portion of the surface density of states are often not standard and are not so readily available. Here we explore the possibility of utilizing the same experimental equipment as in AES to derive information about the unoccupied portion of the surface density of states from a characteristic loss spectroscopy, in particular, from core-level inelastic electron-scattering spectroscopy (CLIESS). An important application of this technique is in comparative studies. CLIESS spectra from clean surfaces of aluminum, beryllium and nickel are presented. These data were taken in the first-derivative mode using the reflection of monoenergetic primary beams of 450 eV energy for Be, and 300 eV for Al and Ni. The Al and Be spectra had to be extracted from overlapping plasmon signals using synthesized plasmon spectra based on the behavior of these spectra between the elastic peak energy and the respective core level threshold energies. After applying loss-deconvolution techniques to remove secondary loss spectral distortions, integral spectra were obtained which compared well to corresponding experimental soft x-ray absorption and transmission electron-energy loss data as well as to theoretical calculations of the unoccupied density-of-states for these materials. Comparison similarities as well as some differences are discussed. Finally, in order to illustrate the potential these signals have in serving as {open_quotes}fingerprints{close_quotes} of surface chemistry, derivative metal-CLIESS curves for the three oxide surfaces of the metals are also presented. {copyright} {ital 1998 American Vacuum Society.}

Madden, H.H.; Landers, R.; Kleiman, G.G. [Instituto de Fisica Gleb Wataghin, Universidade Estadual de Campinas (UNICAMP), Caixa Postal 6165, 13081-970 Campinas, Sao Paulo, Brasil] [Instituto de Fisica Gleb Wataghin, Universidade Estadual de Campinas (UNICAMP), Caixa Postal 6165, 13081-970 Campinas, Sao Paulo, Brasil; Zehner, D.M. [Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6057 (United States)] [Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6057 (United States)

1998-07-01T23:59:59.000Z

88

Joining NiAl using simultaneous combustion synthesis and pressure  

SciTech Connect (OSTI)

Nickel aluminide-based intermetallics are attractive in applications requiring high thermal stability, corrosion and oxidation resistance, and high-temperature mechanical properties. However, if components are to be produced using these intermetallics, efficient joining techniques need to be developed. This paper provides an initial investigation of the application of combustion (self propagating, high temperature) synthesis (SHS) as a means of joining NiAl intermetallic materials. Combustion synthesis is a technique whereby an exothermic reaction mixture is used to synthesize the required product(s). If the reaction is sufficiently exothermic, it can be self sustaining once initiated at the ignition temperature, Tig. The heat generated by the reaction results in an increase in temperature to a maximum combustion temperature, Tc, which is usually less than the calculated adiabatic temperature, Tad, on account of heat losses from the reaction. Combustion synthesis reactions can be operated in two different modes of ignition, i.e. propagating and simultaneous combustion modes. In each case, the exothermic reactant mix, typically in powder form, is pressed in the required reaction stoichiometry and at a certain green density. In reaction mixtures which are less exothermic, such as the synthesis of an intermetallic compound from its elements, e.g. reaction, the simultaneous combustion mode is often used.

Torres, R.D.; Strohaecker, T.R. (PPGEMM/UFRGS, Porto Alegre (Brazil)); Moore, J.J.; Edwards, G.R. (Colorado School of Mines, Golden, CO (United States). Dept. of Metallurgical and Materials Engineering)

1994-02-15T23:59:59.000Z

89

Band gap structure modification of amorphous anodic Al oxide film by Ti-alloying  

SciTech Connect (OSTI)

The band structure of pure and Ti-alloyed anodic aluminum oxide has been examined as a function of Ti concentration varying from 2 to 20 at.?%. The band gap energy of Ti-alloyed anodic Al oxide decreases with increasing Ti concentration. X-ray absorption spectroscopy reveals that Ti atoms are not located in a TiO{sub 2} unit in the oxide layer, but rather in a mixed Ti-Al oxide layer. The optical band gap energy of the anodic oxide layers was determined by vacuum ultraviolet spectroscopy in the energy range from 4.1 to 9.2?eV (300–135?nm). The results indicate that amorphous anodic Al{sub 2}O{sub 3} has a direct band gap of 7.3?eV, which is about ?1.4?eV lower than its crystalline counterpart (single-crystal Al{sub 2}O{sub 3}). Upon Ti-alloying, extra bands appear within the band gap of amorphous Al{sub 2}O{sub 3}, mainly caused by Ti 3d orbitals localized at the Ti site.

Canulescu, S., E-mail: stec@fotonik.dtu.dk; Schou, J. [Department of Photonics Engineering, Technical University of Denmark, 4000 Roskilde (Denmark); Rechendorff, K.; Pleth Nielsen, L. [Danish Technological Institute, Kongsvang Alle 29, 8000 Aarhus (Denmark); Borca, C. N. [Paul Scherrer Institute, 5232 Villigen (Switzerland); Jones, N. C.; Hoffmann, S. V. [ISA, Department of Physics and Astronomy, Aarhus University, 8000 Aarhus (Denmark); Bordo, K.; Ambat, R. [Department of Mechanical Engineering, Technical University of Denmark, 2800 Kongens Lyngby (Denmark)

2014-03-24T23:59:59.000Z

90

Intermixing criteria for reaction synthesis of Ni/Al multilayered microfoils  

E-Print Network [OSTI]

synthesis technique for intermetallics involves both a self-propagating high-temperature synthe- sis (SHSIntermixing criteria for reaction synthesis of Ni/Al multilayered microfoils Hee Y. Kim a , Dong S are proposed for determining the microstructure of the reaction products during the reaction synthesis of Ni

Hong, Soon Hyung

91

Revealing the atomic and electronic structure of a SrTiO{sub 3}/LaNiO{sub 3}/SrTiO{sub 3} heterostructure interface  

SciTech Connect (OSTI)

The atomic structures of SrTiO{sub 3} (STO)/LaNiO{sub 3} (LNO)/STO heterostructure interfaces were investigated by spherical aberration-corrected (C{sub S}) (scanning) transmission electron microscopy. Atomic displacement and lattice distortion measurements and electron energy loss spectroscopy (EELS) were used to quantitatively analyze the distortion of the interfacial octahedra and the bond length at the interfaces. Combined with high-resolution transmission electron microscopy (HRTEM) and scanning transmission electron microscopy analyses, two distinct interfacial atomic terminating layers are unambiguously determined. Ensuing quantitative HRTEM measurements revealed that the Ni-O bond length in the interfacial octahedral is elongated at the bottom interface (–NiO{sub 2}-SrO–). Atomic displacement shows structural relaxation effects when crossing the interfaces and lattice distortions across the interface is more pronounced in LNO than in STO. The Ti/O atomic ratio, La and Ti relative atomic ratio as derived by EELS quantification indicate non-stoichiometric composition at the interfaces. Distinct fine structures of Ti-L{sub 2,3} edge and O-K edge at the bottom and top interfaces are observed. By comparison, we are able to estimate Ti valency at both interfaces. Combining the structural distortions and Ti valency, the polar discontinuity and charge transfer at the interfaces are discussed.

Zhang, Zaoli, E-mail: zaoli.zhang@oeaw.ac.at [Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Leoben (Austria); Electron Microscopy Group for Materials Science, University of Ulm, Ulm (Germany); Soltan, S. [Max-Planck Institute for Solid State Research, D-70561 Stuttgart (Germany); Faculty of Science, Helwan University, 11795 Cairo (Egypt); Schmid, H. [INM—Leibniz-Institut für Neue Materialien, 66123 Saarbrücken (Germany); Habermeier, H.-U.; Keimer, B. [Max-Planck Institute for Solid State Research, D-70561 Stuttgart (Germany); Kaiser, U. [Electron Microscopy Group for Materials Science, University of Ulm, Ulm (Germany)

2014-03-14T23:59:59.000Z

92

Low thermal expansion behavior and thermal durability of ZrTiO4Al2TiO5Fe2O3 ceramics between 750 and 1400  

E-Print Network [OSTI]

2002 Abstract The thermal-shock-resistant materials in the system Al2TiO5­ZrTiO4 (ZAT) were synthesized Aluminum titanate (Al2TiO5) is well-known as an excellent thermal shock-resistant material, resulting from. All rights reserved. Keywords: Al2TiO5; Thermal expansion; Thermal shock resistance 1. Introduction

Cao, Guozhong

93

al-ni intermetallic compound: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

multilayer foils Jonathan C. Trenkle,1 Physics Websites Summary: August 2008 We have used self-propagating exothermic reactions in AlNi multilayers as a means to explore the...

94

Thermodynamic modeling and experimental validation of the Fe-Al-Ni-Cr-Mo alloy system  

SciTech Connect (OSTI)

NiAl-type precipitate-strengthened ferritic steels have been known as potential materials for the steam turbine applications. In this study, thermodynamic descriptions of the B2-NiAl type nano-scaled precipitates and body-centered-cubic (BCC) Fe matrix phase for four alloys based on the Fe-Al-Ni-Cr-Mo system were developed as a function of the alloy composition at the aging temperature. The calculated phase structure, composition, and volume fraction were validated by the experimental investigations using synchrotron X-ray diffraction and atom probe tomography. With the ability to accurately predict the key microstructural features related to the mechanical properties in a given alloy system, the established thermodynamic model in the current study may significantly accelerate the alloy design process of the NiAl-strengthened ferritic steels.

Teng, Zhenke [ORNL; Zhang, F [CompuTherm LLC, Madison, WI; Miller, Michael K [ORNL; Liu, Chain T [Hong Kong Polytechnic University; Huang, Shenyan [ORNL; Chou, Y.T. [Multi-Phase Services Inc., Knoxville; Tien, R [Multi-Phase Services Inc., Knoxville; Chang, Y A [ORNL; Liaw, Peter K [University of Tennessee, Knoxville (UTK)

2012-01-01T23:59:59.000Z

95

Characterization of TiN, TiC and TiCN coatings on Ti50.6 at.% Ni alloy deposited by PIII and deposition technique  

E-Print Network [OSTI]

high content of nickel [1]. In addition, its wear resistance is expected to be improved by transition-metal as nitride, carbide and carbonitride, respectively. Based on the electrochemical measurement and ion carbides and nitrides coatings at a rather broad composition range, such as TiN, TiC and TiC1-xNx (0bĂ?b1

Zheng, Yufeng

96

Alloying effects on mechanical and metallurgical properties of NiAl  

SciTech Connect (OSTI)

Alloying effects were investigated in near-stoichiometric NiAl for improving its mechanical and metallurgical properties. Ternary additions of 19 elements at levels up to 10 at. % were added to NiAl; among them, molybdenum is found to be most effective in improving the room-temperature ductility and high-temperature strength. Alloying with 1.0 {plus_minus} 0.6% molybdenum almost doubles the room-temperature tensile ductility of NiAl and triples its yield strength at 1000C. The creep properties of molybdenum-modified NiAl alloys can be dramatically improved by alloying with up to 1% of niobium or tantalum. Because of the low solubilities of molybdenum and niobium in NiAl, the beneficial effects mainly come from precipitation hardening. Fine and coarse precipitates are revealed by both transmission electron microscopy (TEM) and electron microprobe analyses. Molybdenum-containing alloys possess excellent oxidation resistance and can be fabricated into rod stock by hot extrusion at 900 to 1050C. This study of alloying effects provides a critical input for the alloy design of ductile and strong NiAl aluminide alloys for high-temperature structural applications.

Liu, C.T.; Horton, J.A.; Lee, E.H.; George, E.P.

1993-06-01T23:59:59.000Z

97

Spillover sites on a 19% Ni/Al sub 2 O sub 3 catalyst  

SciTech Connect (OSTI)

Two distinct methanation sites are clearly identified on a 19% Ni/Al{sub 2}O{sub 3} catalyst by temperature-programmed reaction (TPR) employing isotope labeling. The two sites, which are present after reduction at 975 K, are due to CO adsorption on Ni crystallites and CO and H spillover onto the Al{sub 2}O{sub 3} support. The concentration of sites on the support is 250 {mu}mol/G Al{sub 2}O{sub 3} (5 {times} 10{sup 13} molecules/cm{sup 2}), which is the same value measured for a 5.1% Ni/Al{sub 2}O{sub 3} catalyst and for a 1.0% Ru/Al{sub 2}O{sub 3} catalyst. Temperature-programmed desorption suggest that the CO and H on the Al{sub 2}O{sub 3} are in the form of a H-CO complex. The formation of this complex is an activated process, which is related to the activated adsorption of H{sub 2}. The H{sub 2} that adsorbs between 300 and 385 K is responsible for this spillover process onto the Al{sub 2}O{sub 3}. Isotope labeling and TPR were used to verify that a H-CO complex does not form on Ni/SiO{sub 2} catalysts. Carbon monoxide adsorption on Ni/SiO{sub 2} was not activated and only one methanation site was seen.

Sen, B.; Falconer, J.L. (Univ. of Colorado, Boulder (USA))

1989-06-01T23:59:59.000Z

98

Effect of Welding Speed and Defocusing Distance on the Quality of Laser Welded Ti-6Al-4V  

E-Print Network [OSTI]

Effect of Welding Speed and Defocusing Distance on the Quality of Laser Welded Ti-6Al-4V A:YAG laser, Laser welding, Ti-6Al-4V alloy Abstract In this study, the weldability of 5.1-mm thick Ti-6Al-4V at various welding speeds and defocusing distances. The joint quality was characterized in terms of weld

Medraj, Mamoun

99

Synthesis and structure of Al clusters supported on TiO2,,110...: A scanning tunneling microscopy study  

E-Print Network [OSTI]

Synthesis and structure of Al clusters supported on TiO2,,110...: A scanning tunneling microscopy, Texas 77843-3255 Received 14 October 1997; accepted 6 April 1998 Al clusters supported on TiO2(110) have been investigated using scanning tunneling microscopy. Al interacts strongly with the TiO2(110) surface

Goodman, Wayne

100

Characterization of Ultrathin Films of -Al2O3 and the Chemistry of 1,3-Butadiene on NiAl(001) and -Al2O3  

E-Print Network [OSTI]

Characterization of Ultrathin Films of -Al2O3 and the Chemistry of 1,3-Butadiene on NiAl(001) and -Al2O3 Michelle M. Ivey, Kathryn A. Layman, Armen Avoyan, Heather C. Allen, and John C. HemmingerVine, California 92697 ReceiVed: October 3, 2002; In Final Form: March 27, 2003 Ultrathin films of -Al2O3 grown

Note: This page contains sample records for the topic "ni ti al" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


101

On the Liquid/Solid Phase Equilibria in the Al-Rich Corner of the Al-Si-Ti Ternary System  

E-Print Network [OSTI]

On the Liquid/Solid Phase Equilibria in the Al-Rich Corner of the Al-Si-Ti Ternary System O; published online February 5, 2014) The nature of liquid-solid phase equilibria in the Al-rich corner of the Al-Si-Ti system are determined by drawing three isothermal sections at 620, 680 and 727 °C

Paris-Sud XI, Université de

102

Precipitation and Thermal Fatigue in Ni-Ti-Zr Shape Memory Alloy Thin Films by Combinatorial nanoCalorimetry  

E-Print Network [OSTI]

- elastic martensitic phase transformation. They demonstrate enhanced power density compared to other associated with the transformation hysteresis by alloying tertiary components [6,7]. Ni-Ti-Zr is seen as one transformation. The response of the samples to heat treatments depends on composition and is controlled

103

Scaling relationship on macroscopic helical domains in NiTi tubes Y.J. He, Q.P. Sun *  

E-Print Network [OSTI]

that determines the size and shape of the helical domain and what is the effect of dry- friction type stress: Macroscopic helical domains Martensitic phase transformation NiTi shape memory alloy tube Energy minimization- ized in a helix-shaped macro-domain consisting of almost fully transformed grains whose statistical

Sun, Qing-Ping

104

Quaternary Germanides Formed in Molten Aluminum: Tb2NiAl4Ge2 and Ce2NiAl6-xGe4-y (x 0.24, y 1.34)  

E-Print Network [OSTI]

Quaternary Germanides Formed in Molten Aluminum: Tb2NiAl4Ge2 and Ce2NiAl6-xGe4-y (x 0.24, y 1 gebildete quaternäre Germanide: Tb2NiAl4Ge2 und Ce2NiAl6-xGe4-y (x 0.24, y 1.34) Inhaltsübersicht. Die ebenfalls die Introduction The use of metal fluxes in exploratory synthesis presents significant synthetic

Trikalitis, Pantelis N.

105

Structural model for the Al72Ni20Co8 decagonal quasicrystals National Renewable Energy Laboratory, Golden, Colorado 80401  

E-Print Network [OSTI]

Structural model for the Al72Ni20Co8 decagonal quasicrystals Yanfa Yan National Renewable Energy, Oak Ridge, Tennessee 37831 Received 15 February 2000 We propose a structure model for the Al72Ni20Co8 decagonal quasicrystals based on its 2 -inflated Al13Co4 approximant phase: Applying a 105 screw operation

Pennycook, Steve

106

Vacancy ordered phases in AlCuNi as average lattices Anandh Subramaniam a,*, S. Ranganathan b  

E-Print Network [OSTI]

Vacancy ordered phases in Al­Cu­Ni as average lattices Anandh Subramaniam a,*, S. Ranganathan b, Bangalore 560012, India Abstract Vacancy ordered phases (VOP) in the Al­Cu­Ni system have an arrangement. Introduction Vacancy ordered phases (VOP) in Al-TM (transition metal) systems are a special class of structures

Subramaniam, Anandh

107

Process for producing Ti-Cr-Al-O thin film resistors  

DOE Patents [OSTI]

Thin films of Ti-Cr-Al-O are used as a resistor material. The films are rf sputter deposited from ceramic targets using a reactive working gas mixture of Ar and O.sub.2. Resistivity values from 10.sup.4 to 10.sup.10 Ohm-cm have been measured for Ti-Cr-Al-O film <1 .mu.m thick. The film resistivity can be discretely selected through control of the target composition and the deposition parameters. The application of Ti-Cr-Al-O as a thin film resistor has been found to be thermodynamically stable, unlike other metal-oxide films. The Ti-Cr-Al-O film can be used as a vertical or lateral resistor, for example, as a layer beneath a field emission cathode in a flat panel display; or used to control surface emissivity, for example, as a coating on an insulating material such as vertical wall supports in flat panel displays.

Jankowski, Alan F. (Livermore, CA); Schmid, Anthony P. (Solana Beach, CA)

2001-01-01T23:59:59.000Z

108

Flat panel display using Ti-Cr-Al-O thin film  

DOE Patents [OSTI]

Thin films of Ti--Cr--Al--O are used as a resistor material. The films are rf sputter deposited from ceramic targets using a reactive working gas mixture of Ar and O.sub.2. Resistivity values from 10.sup.4 to 10.sup.10 Ohm-cm have been measured for Ti--Cr--Al--O film <1 .mu.m thick. The film resistivity can be discretely selected through control of the target composition and the deposition parameters. The application of Ti--Cr--Al--O as a thin film resistor has been found to be thermodynamically stable, unlike other metal-oxide films. The Ti--Cr--Al--O film can be used as a vertical or lateral resistor, for example, as a layer beneath a field emission cathode in a flat panel display; or used to control surface emissivity, for example, as a coating on an insulating material such as vertical wall supports in flat panel displays.

Jankowski, Alan F. (Livermore, CA); Schmid, Anthony P. (Solan Beach, CA)

2002-01-01T23:59:59.000Z

109

E-Print Network 3.0 - al si ti Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

and Gibbs 1976). 12;KROEKER ET AL.: OXYGEN-17 NMR OF GLASSY AND CRYSTALLINE TITANITE 575 CaTiSiO5 glass... ; Lee and Stebbins 2000; Zhao et ... Source: Nur, Amos -...

110

Crystallization and phase transformations in amorphous NiTi thin films for microelectromechanical systems  

SciTech Connect (OSTI)

Amorphous sputtered nickel-titanium thin films were deposited onto micromachined silicon-nitride membranes and subjected to heating and cooling conditions. Their associated microstructure was monitored directly and simultaneously with in situ transmission electron microscopy. These electron-transparent membranes constrained the NiTi films and rendered it possible for observation of the complete transformation cycle, which includes: the crystallization of the amorphous phase to austenite phase (cubic B2 structure) with heating; and the conversion of austenite (B2) to martensite (monoclinic B19{sup '} structure) with cooling. Electron micrographs show the nucleation and growth of grains occurs at a temperature of 470 deg. C and at a rate that indicates a polymorphic transformation. The onset of martensitic transformation occurs between 25 and 35 deg. C. Calorimetric measurements are consistent with the observed crystallization.

Lee, Hoo-Jeong; Ramirez, Ainissa G. [Department of Mechanical Engineering, Yale University, New Haven, Connecticut 06520 (United States)

2004-08-16T23:59:59.000Z

111

Short-range order of low-coverage Ti/Al,,111...: Implications for hydrogen storage in complex metal hydrides  

E-Print Network [OSTI]

Short-range order of low-coverage Ti/Al,,111...: Implications for hydrogen storage in complex metal-coverage Ti atoms on Al 111 as a model surface system for transition metal doped alanate hydrogen storage the dissociative chemisorption of hydrogen in Ti-doped alanate storage materials. © 2007 American Institute

Ciobanu, Cristian

112

The PUCOT for measuring dynamic Young's modulus for the B?-CoAl, FeAl and NiAl alloys  

E-Print Network [OSTI]

THE PUCOT FOR MEASURIN' DYNAMIC YOUNG'S MODULUS FOR THE B2-CoA1, FeA1 AND NiA1 ALLOYS A Thesis by MAHMOUD REDWAN HARMOUCHE Submitted to the Graduate College of Texas A&M University in partial fulfillment of the requirements for the degree... function of Ni (in atomic %) is shown in Fig. 4. 4. Again, the data have been analyzed using LRA. An excellent fit to a straight line was found where the correlation between p and X3 is: pN Al = 2268. 64 + 71. 06 (X3) + 12. 02 kg/m 3 NiA1 with R...

Harmouche, Mahmoud Redwan

2012-06-07T23:59:59.000Z

113

Corrosion protection and galvanic corrosion prevention for 7075 Al and Ti-6Al-6V-2Sn alloys. Final report  

SciTech Connect (OSTI)

Sulfuric-acid-anodized and electroless-nickel-plated 7075 aluminum alloy panels successfully passed 96 hours of salt spray testing when galvanically coupled to duplex-annealed Ti-6Al-6V-2Sn alloy panels. Adherent paint deposits were produced on the titanium alloy and electroless nickel surfaces using a wash primer, an epoxy primer, and a urethane paint coating. A painted part survived 35 cycles of alternating salt spray and hot and freezing environments without blistering. A low chloride cutting fluid was selected for production machining of Ti-6Al-6V-2Sn, based on chemical analysis and stress-corrosion tests. A cleaning process was developed to remove both titanium and aluminum cutting fluids. Modified wedge-opening-loading specimens were used to verify that no stress-corrosion cracking problems occurred with the duplex-annealed Ti-6Al-6V-2Sn alloy because of residual titanium or aluminum cutting fluids.

Clay, F.A.

1980-07-01T23:59:59.000Z

114

Electrodeposition of Ni[sub 1[minus]x]Al[sub x] in a chloroaluminate melt  

SciTech Connect (OSTI)

The formation of Ni[sub 1[minus]x]Al[sub x] from a molten 2 AlCl[sub 3]-NaCl electrolyte containing up to 0.17 mol/liter Ni(II) has been investigated using a variety of electrochemical techniques. The standard reversible potential for Ni/Ni(II) is found to be in the range of 0.86 to 0.93 V (vs. Al). In a nickel-free electrolyte aluminum deposition on tungsten occurs via instantaneous nucleation upon an underpotential deposition aluminum layer. In contrast, bulk nickel deposition occurs by progressive formation and diffusion-limited growth of three-dimensional nuclei. The number of nickel atoms forming a critical nuclei, n[sub c], is dependent on overpotential. At potentials below 0.750 V, n[sub c] = 0 with the active sites on the electrode playing the role of critical nuclei. These sites are occupied according to first-order kinetics. At potentials above 0.7 V compact nickel deposits are obtained. As the potential is decreased below 0.6 V Ni[sub 1[minus]x]-Al[sub x] formation occurs. Between 0.6 and 0.0 V alloy composition is a function of potential. The rate of the aluminum partial reaction is first order in the Ni(II) concentration which makes alloy composition independent of Ni(II) concentration over the range investigated. Separate experiments demonstrate that aluminum underpotential deposition on nickel occurs in this potential regime. Thus, alloy formation may be envisioned as aluminum underpotential deposition proceeding simultaneously with diffusion-limited nickel deposition. The underpotential deposition reaction occurs rapidly such that the alloy composition is determined by the free energy of alloy formation. When the potential is decreased below the reversible potential of aluminum, 0.0 V, phase formation is complicated by a competition between alloy formation and overpotential driven kinetics of aluminum deposition.

Moffat, T.P. (National Inst. of Standards and Technology, Gaithersburg, MD (United States). Materials Science and Engineering Lab.)

1994-11-01T23:59:59.000Z

115

Analysis of the e-beam evaporation of titanium and Ti-6Al-4V  

SciTech Connect (OSTI)

An experimental and finite element analysis was performed for the electron-beam evaporation of Ti and Ti-6Al-4V from a bottom-feed system. The bulk evaporation rate was measured by feed consumption, and the pool elevation was held constant by adjusting the feed rate in a closed-loop control system. The instantaneous titanium and aluminum evaporation rates were determined by laser absorption in the vapor plume. Water temperature rises in cooling water circuits provided heat flows, and post-run cross sections revealed the location of the solidification zone. The MELT finite element code was applied to model the steady-state two-dimensional fluid flow and energy transport in the rod. There was good agreement between model and measured values of the heat flows and solidification boundaries for Ti. Measured bulk evaporation rates were similar for Ti and Ti-6-4 with greater variation observed for the Ti values. The model evaporation rates were higher than the measured values, but a similar linear dependence on e-beam power was observed in all cases. In a Ti-6-4 evaporation experiment with steady process conditions, laser absorption measurements showed much larger fluctuations in the evaporation rate for Al than Ti.

Westerberg, K.W.; Merier, T.C.; McClelland, M.A.; Braun, D.G.; Berzins, L.V.; Anklam, T.M.; Storer, J.

1998-02-11T23:59:59.000Z

116

The determination of interfacial structure and phase transitions in Al/Cu and Al/Ni interfaces by means of surface extended x-ray absorption fine structure  

SciTech Connect (OSTI)

Surface extended x-ray absorption fine structure (SEXAFS) was used to investigate the interfacial conditions of Al/Cu and Al/Ni shallow buried interfaces. Previous studies using glancing angle extended x-ray absorption fine structure, x-ray reflectivity, photoemission, and SEXAFS produced conflicting results as to whether or not the interfaces between Al and Cu and Al and Ni were reacted upon room temperature deposition. In this study polycrystalline bilayers of Al/Cu and Al/Ni and trilayers of Al/Cu/Al and Al/Ni/Al were deposited on tantalum foil at room temperature in ultra high vacuum and analyzed to evaluate the reactivity of these systems on a nanometer scale. It become overwhelming apparent that the interfacial phase reactions were a function of the vacuum conditions. Samples deposited with the optimum vacuum conditions showed reaction products upon deposition at room temperature which were characterized by comparisons to standards and by least squares fitting the be CuAl{sub 2} and NiAl{sub 3} respectively. The results of this study that the reacted zone thicknesses were readily dependent on the deposition parameters. For both Al on Cu and Al on Ni as well as the metal on Al conditions 10{Angstrom} reaction zones were observed. These reaction zones were smaller than that observed for bilayers of Al on Cu (30{Angstrom}) and Al on Ni (60{Angstrom}) where deposition rates were much higher and samples were much thicker. The reaction species are evident by SEXAFS, where the previous photoemission studies only indicated that changes had occurred. Improved vacuum conditions as compared to the earlier experiments is primarily the reason reactions on deposition were seen in this study as compared to the earlier SEXAFS studies.

Barrera, E.V. (Rice Univ., Houston, TX (United States). Dept. of Mechanical Engineering and Materials Science); Heald, S.M. (Brookhaven National Lab., Upton, NY (United States))

1991-01-01T23:59:59.000Z

117

The determination of interfacial structure and phase transitions in Al/Cu and Al/Ni interfaces by means of surface extended x-ray absorption fine structure  

SciTech Connect (OSTI)

Surface extended x-ray absorption fine structure (SEXAFS) was used to investigate the interfacial conditions of Al/Cu and Al/Ni shallow buried interfaces. Previous studies using glancing angle extended x-ray absorption fine structure, x-ray reflectivity, photoemission, and SEXAFS produced conflicting results as to whether or not the interfaces between Al and Cu and Al and Ni were reacted upon room temperature deposition. In this study polycrystalline bilayers of Al/Cu and Al/Ni and trilayers of Al/Cu/Al and Al/Ni/Al were deposited on tantalum foil at room temperature in ultra high vacuum and analyzed to evaluate the reactivity of these systems on a nanometer scale. It become overwhelming apparent that the interfacial phase reactions were a function of the vacuum conditions. Samples deposited with the optimum vacuum conditions showed reaction products upon deposition at room temperature which were characterized by comparisons to standards and by least squares fitting the be CuAl{sub 2} and NiAl{sub 3} respectively. The results of this study that the reacted zone thicknesses were readily dependent on the deposition parameters. For both Al on Cu and Al on Ni as well as the metal on Al conditions 10{Angstrom} reaction zones were observed. These reaction zones were smaller than that observed for bilayers of Al on Cu (30{Angstrom}) and Al on Ni (60{Angstrom}) where deposition rates were much higher and samples were much thicker. The reaction species are evident by SEXAFS, where the previous photoemission studies only indicated that changes had occurred. Improved vacuum conditions as compared to the earlier experiments is primarily the reason reactions on deposition were seen in this study as compared to the earlier SEXAFS studies.

Barrera, E.V. [Rice Univ., Houston, TX (United States). Dept. of Mechanical Engineering and Materials Science; Heald, S.M. [Brookhaven National Lab., Upton, NY (United States)

1991-12-31T23:59:59.000Z

118

Recent advances in alloy design of Ni{sub 3}Al alloys for structural use  

SciTech Connect (OSTI)

This is a comprehensive review of recent advances in R&D of Ni{sub 3}Al-based alloys for structural use at elevated temperatures in hostile environments. Recent studies indicate that polycrystalline Ni{sub 3}Al is intrinsically quite ductile at ambient temperatures, and its poor tensile ductility and brittle grain-boundary fracture are caused mainly by moisture-induced hydrogen embrittlement when the aluminide is tested in moisture- or hydrogen-containing environments. Tensile ductility is improved by alloying with substitutional and interstitial elements. Among these additives, B is most effective in suppressing environmental embrittlement and enhancing grain-boundary cohesion, resulting in a dramatic increase of tensile ductility at room temperature. Both B-doped and B-free Ni{sub 3}Al alloys exhibit brittle intergranular fracture and low ductility at intermediate temperatures (300-850 C) because of oxygen-induced embrittlement in oxidizing environments. Cr is found to be most effective in alleviating elevated-temperature embrittlement. Parallel efforts on alloy development using physical metallurgy principles have led to development of several Ni{sub 3}Al alloys for industrial use. The unique properties of these alloys are briefly discussed. 56 refs, 15 figs, 3 tabs.

Liu, C.T.; George, E.P.

1996-12-31T23:59:59.000Z

119

Ni3Al-based alloys for die and tool application  

DOE Patents [OSTI]

A novel Ni.sub.3 Al-based alloy exhibits strengths and hardness in excess of the standard base alloy IC-221M at temperatures of up to about 1000.degree. C. The alloy is useful in tool and die applications requiring such temperatures, and for structural elements in engineering systems exposed to such temperatures.

Liu, Chain T. (Oak Ridge, TN); Bloom, Everett E. (Kingston, TN)

2001-01-01T23:59:59.000Z

120

Ni.sub.3 Al-based intermetallic alloys having improved strength above 850.degree. C.  

DOE Patents [OSTI]

Intermetallic alloys composed essentially of: 15.5% to 17.0% Al, 3.5% to 5.5% Mo, 4% to 8% Cr, 0.04% to 0.2% Zr, 0.04% to 1.5% B, balance Ni, are characterized by melting points above 1200.degree. C. and superior strengths at temperatures above 1000.degree. C.

Liu, Chain T. (Oak Ridge, TN)

2000-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "ni ti al" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


121

Mechanical and microstructural response of Ni sub 3 Al at high strain rate and elevated temperatures  

SciTech Connect (OSTI)

In this paper, the effect of strain rate and temperature on the substructure evolution and mechanical response of Ni{sub 3}Al will be presented. The strain rate response of Ni{sub 3}Al was studied at strain rates from 10{sup {minus}3} s{sup {minus}1} (quasi-static) to 10{sup 4} s{sup {minus}1} using a Split Hopkinson Pressure Bar. The Hopkinson Bar tests were conducted at temperatures ranging from 77K to 1273K. At high strain rates the flow strength increased significantly with increasing temperature, similar to the behavior observed at quasi-static rates. The work hardening rates increased with strain rate and varied with temperatures. The work hardening rates, appeared to be significantly higher than those found for Ni270. The substructure evolution was characterized utilizing TEM. The defect generation and rate sensitivity of Ni{sub 3}Al are also discussed as a function of strain rate and temperature. 15 refs., 4 figs.

Sizek, H.W.; Gray, G.T. III.

1990-01-01T23:59:59.000Z

122

Effect of Reactive Sputtering Parameters on TiAlN Nanocoating Structure and Morphology  

SciTech Connect (OSTI)

The effect of substrate bias and nitrogen flow rate on the TiAlN nanocoating structure and morphology has been investigated by using reactive unbalance DC magnetron sputtering. TiAlN nanocoating was deposited on the tungsten carbide insert tool and the structure and morphology were characterized by using XRD and AFM, respectively. The substrate bias was varied between 0 to -221 V and the nitrogen flow rate was varied between 30 to 72 sccm. The results showed that the structure of TiAlN nanocoating consisted of mainly (111) and (200) plane. The structure was significatly influenced by substrate bias in promoting finer crystal size and increased crystal plane spacing while the rms roughness of nanocoating was influenced by substrate bias and nitrogen flow rate.

Budi, Esmar [Jurusan Fisika FMIPA Universitas Negeri Jakarta Jl. Pemuda No. 10 Rawamangun Jakarta 13220 (Indonesia); Razali, M. Mohd.; Nizam, A. R. Md. [Faculty of Manufacturing Engineering Universiti Teknikal Malaysia Melaka (UTeM) Karung Berkunci No 1752 Pejabat Pos Durian Tunggal 76109 Melaka (Malaysia)

2010-10-24T23:59:59.000Z

123

Improving the phase stability and oxidation resistance of B-NiAl  

SciTech Connect (OSTI)

High temperature alloys are essential to many industries that require a stable material to perform in harsh oxidative environments. Many of these alloys are suited for specific applications such as jet engine turbine blades where most other materials would either melt or oxidize and crumble (1). These alloys must have a high melting temperature, excellent oxidation resistance, good creep resistance, and decent fracture toughness to be successfully used in such environments. The discovery of Ni based superalloys in the 1940s revolutionized the high temperature alloy industry and there has been continued development of these alloys since their advent (2). These materials are capable of operating in oxidative environments in the presence of combustion gases, water vapor and at temperatures around 1050 C. Demands for increased f uel efficiency, however, has highlighted the need for materials that can be used under similar atmospheres and at temperatures in excess of 1200 C. The current Ni based superalloys are restricted to lower temperatures due to the presence of a number of low melting phases that result in softening of the alloys above 1000 C. Therefore, recent research has been aimed at exploring and developing newer alloy systems that can meet the escalating requirements. This thesis comprises a part of such an effort. The motivation of this work is to develop a novel high temperature alloy system that shows improved performance at higher temperatures than the currently employed alloys. The desired alloy should be in accordance with the requirements established in the National Energy Technology Laboratory (NETL) FutureGen program having an operating temperature around 1300 C. Alloys based on NiAl offer significant potential payoffs as structural materials in gas turbine applications due to a unique range of physical and mechanical properties. Alloying additions to NiAl could be used to further improve the pertinent properties that currently limit this system from replacing Ni based superalloys. Modifications to NiAl were explored to increase the phase stability and oxidation resistance which would allow these alloys to be used at even higher temperatures yielding greater efficiencies. The extended Miedema model was an effective tool that screened all of the potential phase space for ternary substitutions to NiAl and found the few potential systems worth further investigation. After production of the alloys it was determined that Ir, Rh, and Pd were the top candidates for substitution on Ni site up to 12 at%. The melting temperature of NiAl could be increased as much as 150 C with 12 at% Ir and 130 C with 12 at% Rh substitution. Pall adium on the other hand decreased the melting temperature by 50 C at the 12 at% substitution level. The grain size was found to have a profound influence on the oxidation resistance. Both Ir and Rh substitutions resulted in finer grain sizes compared to Pd substitutions or base NiAl. The grain size increased drastically during high temperature annealing with the PGM substitutions hindering grain growth only slightly. However, the addition of 0.05 at% Hf limited the grain growth dramatically during high temperature annealing. NiAl inherently has respectable oxidation resistance up to 1100 C. It was found through experimental testing that both Ir and Rh substitutions improve the oxidation resistance of NiAl at ultra-high temperatures with Ir performing the best. Both PGM substitutions decreased the growth rate as well as forming a more adherent oxide scale. Pd substitutions appeared to have a negligible effect to the oxidation resistance of NiAl. Hafnium addition of 0.05 at% was found to decrease the oxidation rate as well as increase the scale adherence. The combination of both Ir substitution (6-9 at%) and Hf addition (0.05 at%) produced the alloy with the best oxidation resistance. Although improvements in phase stability and oxidation resistance have been made to the NiAl system, more development and testing are still needed. Two major issues yet to be resolved are the low fracture toughn

Brammer, Travis

2011-08-15T23:59:59.000Z

124

Characterization of Ni/Al multilayer on Si substrate by diffraction and reflectometry techniques  

SciTech Connect (OSTI)

An ion beam deposited multilayer film of nominal thickness [Ni(200 Angst )/Al(100 Angst )]x5 on Si substrate has been characterized by X-Ray Diffraction(XRD), X-Ray Reflectivity (XRR) and Polarized neutron reflectivity(PNR). The present paper attempts to identify presence of any intermetallic compounds at the interfaces of the as-deposited sample. Structural parameters obtained from XRR and PNR are close to design values.

Swain, Mitali; Basu, Saibal; Bhattacharya, Debarati; Gupta, Mukul [Solid State Physics Division Bhabha Atomic Research Center, Mumbai 400085 (India); UGC-DAE-Consortium for Scientific Research, University Campus, Khandwa Road, Indore 452017 (India)

2012-06-05T23:59:59.000Z

125

Simply AlF3-treated Li4Ti5O12 composite anode materials for stable...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Simply AlF3-treated Li4Ti5O12 composite anode materials for stable and ultrahigh power lithium-ion batteries. Simply AlF3-treated Li4Ti5O12 composite anode materials for stable and...

126

High Temperature Oxidation Behavior of gamma-Ni+gamma'-Ni3Al Alloys and Coatings Modified with Pt and Reactive Elements  

SciTech Connect (OSTI)

Materials for high-pressure turbine blades must be able to operate in the high-temperature gases (above 1000 C) emerging from the combustion chamber. Accordingly, the development of nickel-based superalloys has been constantly motivated by the need to have improved engine efficiency, reliability and service lifetime under the harsh conditions imposed by the turbine environment. However, the melting point of nickel (1455 C) provides a natural ceiling for the temperature capability of nickel-based superalloys. Thus, surface-engineered turbine components with modified diffusion coatings and overlay coatings are used. Theses coatings are capable of forming a compact and adherent oxide scale, which greatly impedes the further transport of reactants between the high-temperature gases and the underlying metal and thus reducing attack by the atmosphere. Typically, these coatings contain {beta}-NiAl as a principal constituent phase in order to have sufficient aluminum content to form an Al{sub 2}O{sub 3} scale at elevated temperatures. The drawbacks to the currently-used {beta}-based coatings, such as phase instabilities, associated stresses induced by such phase instabilities, and extensive coating/substrate interdiffusion, are major motivations in this study to seek next-generation coatings. The high-temperature oxidation resistance of novel Pt + Hf-modified {gamma}-Ni + {gamma}-Ni{sub 3}Al-based alloys and coatings were investigated in this study. Both early-stage and 4-days isothermal oxidation behavior of single-phase {gamma}-Ni and {gamma}{prime}-Ni{sub 3}Al alloys were assessed by examining the weight changes, oxide-scale structures, and elemental concentration profiles through the scales and subsurface alloy regions. It was found that Pt promotes Al{sub 2}O{sub 3} formation by suppressing the NiO growth on both {gamma}-Ni and {gamma}{prime}Ni{sub 3}Al single-phase alloys. This effect increases with increasing Pt content. Moreover, Pt exhibits this effect even at lower temperatures ({approx}970 C) in the very early stage of oxidation. It was also inferred that Pt enhances the diffusive flux of aluminum from the substrate to the scale/alloy interface. Relatively low levels of hafnium addition to Pt-free {gamma}{prime}-Ni{sub 3}Al increased the extent of external NiO formation due to non-protective HfO{sub 2} formation. Accordingly, this effect intensified with increasing Hf content from 0.2 to 0.5 at.%.

Nan Mu

2007-12-01T23:59:59.000Z

127

Molecular dynamics simulations of the melting curve of NiAl alloy under pressure  

SciTech Connect (OSTI)

The melting curve of B2-NiAl alloy under pressure has been investigated using molecular dynamics technique and the embedded atom method (EAM) potential. The melting temperatures were determined with two approaches, the one-phase and the two-phase methods. The first one simulates a homogeneous melting, while the second one involves a heterogeneous melting of materials. Both approaches reduce the superheating effectively and their results are close to each other at the applied pressures. By fitting the well-known Simon equation to our melting data, we yielded the melting curves for NiAl: 1783(1 + P/9.801){sup 0.298} (one-phase approach), 1850(1 + P/12.806){sup 0.357} (two-phase approach). The good agreement of the resulting equation of states and the zero-pressure melting point (calc., 1850 ± 25 K, exp., 1911 K) with experiment proved the correctness of these results. These melting data complemented the absence of experimental high-pressure melting of NiAl. To check the transferability of this EAM potential, we have also predicted the melting curves of pure nickel and pure aluminum. Results show the calculated melting point of Nickel agrees well with experiment at zero pressure, while the melting point of aluminum is slightly higher than experiment.

Zhang, Wenjin; Peng, Yufeng [College of Physics and electronic Engineering, Henan Normal University, Xinxiang, 453007 (China)] [College of Physics and electronic Engineering, Henan Normal University, Xinxiang, 453007 (China); Liu, Zhongli, E-mail: zhongliliu@yeah.net [College of Physics and Electric Information, Luoyang Normal University, Luoyang, 471002 (China)] [College of Physics and Electric Information, Luoyang Normal University, Luoyang, 471002 (China)

2014-05-15T23:59:59.000Z

128

Processing and Mechanical Properties of Ti2AlC Reinforced with Alumina Fibers  

E-Print Network [OSTI]

, even at temperature as high as 1400 oC at which reaction between Ti2AlC and NextelTM 720 was observed. The double torsion (DT) tests were carried out at room temperature to measure the fracture toughness of the HIPed pure and 5vol% alumina fiber...

Jeon, Kwonguk

2012-10-19T23:59:59.000Z

129

Process Modeling of Ti-6Al-4V Linear Friction Welding (LFW)  

E-Print Network [OSTI]

Process Modeling of Ti-6Al-4V Linear Friction Welding (LFW) Mica Grujicic, G. Arakere, B finite-element analysis of the linear friction welding (LFW) process is combined with the basic physical in the open literature revealed that the weld region consists of a thermo- mechanically affected zone (TMAZ

Grujicic, Mica

130

Surface Engineering to Improve the Durability and Lubricity of Ti-6Al-4V Alloy  

SciTech Connect (OSTI)

Titanium alloys offer high strength, high corrosion resistance, and the opportunity to reduce the weight of heavy vehicle engine components, but they do not perform well as bearing surfaces without further treatments or coatings. This paper explores a series of surface engineering treatments to improve the friction and wear behavior of Ti-6Al-4V alloy under diesel engine oil-lubricated conditions.

Bansal, Dinesh G [ORNL; Eryilmaz, Osman L [Argonne National Laboratory (ANL); Blau, Peter Julian [ORNL

2011-01-01T23:59:59.000Z

131

Mechanism(s) of Ni Sorption on Al-Hydroxy-Interlayered Vermiculite Using Time-Resolved EXAFS  

E-Print Network [OSTI]

Mechanism(s) of Ni Sorption on Al-Hydroxy-Interlayered Vermiculite Using Time-Resolved EXAFS D. R and the chemistry of soil clay minerals. In many weathered soils an abundance of Al-hydroxy-interlayered vermiculite (HIV) is present in the clay-size fraction. The Al in the interlayers is potentially quite reactive

Sparks, Donald L.

132

Use of periodic approximants in a dynamical LEED study of the quasicrystalline tenfold surface of decagonal Al-Ni-Co  

E-Print Network [OSTI]

of decagonal Al-Ni-Co K. Pussi Department of Electrical Engineering, Lappeenranta University of Technology, P.O. Box 20, FIN-53851 Lappeenranta, Finland N. Ferralis Physics Department and Materials Research

Widom, Michael

133

Stress Development and Relaxation in Al2O3 during Early StageOxidation of beta-NiAl  

SciTech Connect (OSTI)

Using a glancing synchrotron X-ray beam (Advanced Photon Source, Beamline 12BM, Argonne National Laboratory), Debye-Scherrer diffraction patterns from thermally grown oxides on NiAl samples were recorded during oxidation at 1000 or 1100 C in air. The diffraction patterns were analyzed to determine strain and phase changes in the oxide scale as it developed and evolved. Strain was obtained from measurements of the elliptical distortion of the Debye-Scherrer rings, where data from several rings of a single phase were used. Results were obtained from {alpha}-Al{sub 2}O{sub 3} as well as from the transition alumina, in this case {theta}-Al{sub 2}O{sub 3}, which formed during the early stage. Compressive stress was found in the first-formed transition alumina, but the initial stress in {alpha}-Al{sub 2}O{sub 3} was tensile, with a magnitude high enough to cause Al{sub 2}O{sub 3} fracture. New {alpha}-Al{sub 2}O{sub 3} patches nucleated at the scale/alloy interface and spread laterally and upward. This transformation not only puts the alpha alumina in tension, but can also cause the transition alumina to be in tension. After a complete {alpha}-Al{sub 2}O{sub 3} layer formed at the interface, the strain level in {alpha}-Al{sub 2}O{sub 3} became compressive, reaching a steady state level around -75 MPa at 1100 C. To study a specimen's response to stress perturbation, samples with different thickness, after several hours of oxidation at 1100 C, were quickly cooled to 950 C to impose a compressive thermal stress in the scale. The rate of stress relaxation was the same for 1 and 3.5 mm thick samples, having a strain rate of {approx} 1 x 10{sup -8}/s. This behavior indicates that oxide creep is the major stress relaxation mechanism.

Hou, P.Y.; Paulikas, A.P.; Veal, B.W.

2005-04-20T23:59:59.000Z

134

Improved magnetoelectric performance of the Ni-P/Ni/Pb(Zr,TiO)3 cylindrical layered composites  

E-Print Network [OSTI]

) cylindrical layered magnetoelectric (ME) composites have been prepared by electroless deposition, and electroless deposition.9­12 Improving magnetoelectric device characteristics can be achieved by enhancing via magnetic flux concentration. Nickel is a kind of universal strong magnetic material, while Ni

Volinsky, Alex A.

135

Environmental effect on room-temperature ductility of isothermally forged TiAl-base alloys  

SciTech Connect (OSTI)

Isothermally forged TiAl-base alloy (Al-rich, Mn-containing, and Cr-containing TiAl) were heat-treated in various conditions, and equiaxed grain structures consisting of [gamma] and [alpha][sub 2] or [beta] phases were obtained. The heat-treated alloys were tensile tested in vacuum and air at room temperature, and the environmental effect on tensile elongation was studied. The ductility of the alloys consisting of equiaxed [gamma] grains and a large amount of [alpha][sub 2] grains was not largely affecting by laboratory air, and a decrease in the amount of [alpha][sub 2] grains resulted in a large reduction of ductility in air. The [beta] phase in the Cr-containing alloy improved the ductility in vacuum, but it resulted in a large reduction of ductility in air.

Nakamura, Morihiko; Hashimoto, Kenki (National Research Inst. for Metals, Tokyo (Japan)); Itoh, Naoyuki (Nippon Steel Corp., Chiba (Japan)); Tsujimoto, Tokuzo (Ibaraki Univ. (Japan). Faculty of Engineering); Suzuki, Toshiyuki (Kougakuin Univ., Tokyo (Japan))

1994-02-01T23:59:59.000Z

136

Influence of dislocation-solute interactions on the mechanical properties of zirconium-doped NiAl  

SciTech Connect (OSTI)

Atom probe field ion microscopy (APFIM) has been used to characterize NiAl microalloyed with molybdenum and zirconium. Field ion images and atom probe analyses revealed segregation of zirconium to dislocation strain fields and ribbon-like morphological features that are probably related to dislocations. These results provide direct experimental evidence in support of the suggestion that the tremendous increase in the ductile-to-brittle transition temperature (DBTI) in zirconium-doped NiAl is due to pinning of dislocations by zirconium atoms. Atom probe analyses also revealed segregation of zirconium to grain boundaries. This result is consistent with the change from an intergranular fracture mode in undoped NiAl to a mixture of intergranular and transgranular fracture mode in zirconium-doped NiAl. The NiAl matrix was severely depleted of the solutes molybdenum and zirconium. Small Mo-rich precipitates, detected in the matrix and grain boundaries, are likely to contribute to the significant increase in the room-temperature yield stress of microalloyed NiAl through a precipitation hardening mechanism.

Jayaram, R. [Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering; Miller, M.K. [Oak Ridge National Lab., TN (United States)

1995-03-01T23:59:59.000Z

137

A Si Photocathode Protected and Activated with a Catalytic Ti and Ni Composite Film for Solar Hydrogen Production in Water  

E-Print Network [OSTI]

, stable and scalable hybrid photo- electrode for visible-light-driven H2 generation in an aque- ous pH 9.2 electrolyte solution is reported. The photoca- thode consists of a p-type Si substrate layered with a Ti and Ni-containing composite film, which acts... for several hours, and serves as a benchmark non-noble photocathode for solar H2 evolution that operates efficiently under neutral–alka- line conditions. Photoelectrochemical (PEC) water splitting is an attractive strategy to generate the renewable energy...

Lai, Yi-Hsuan; Park, Hyun S.; Zhang, Jenny Z.; Matthews, Peter D.; Wright, Dominic S.; Reisner, Erwin

2015-02-04T23:59:59.000Z

138

Isotopic identification of surface site transfer on Ni/Al/sub 2/O/sub 3/ catalysts  

SciTech Connect (OSTI)

Isotope labeling with temperature-programmed reaction (TPR) for CO hydrogenation was used to separate two distinct CO adsorption sites on a Ni/Al/sub 2/O/sub 3/ catalysts. One site is Ni metal and has the higher activity for CO hydrogenation. The less-reactive CO is on the Al/sub 2/O/sub 3/ support. Only the Ni metal is occupied at 300 K, and transfer for CO between the two sites occurs at higher temperatures. In the presence of adsorbed H/sub 2/, CO that was adsorbed on the Ni metal moved to the Al/sub 2/O/sub 3/ support. This is an activated process, and the only pathway to occupy the Al/sub 2/O/sub 3/ sites is by adsorption on the Ni. The reverse transfer from Al/sub 2/O/sub 3/ to Ni occurs if some of the H/sub 2/ is desorbed; surface hydrogen inhibits this reverse process. These results show that during a typical TPR experiment, transfer between sites competes with reaction.

Gugla, P.G.; Bailey, K.M.; Falconer, J.L.

1988-07-28T23:59:59.000Z

139

Micro-Raman spectroscopic study of nanolaminated Ti{sub 5}Al{sub 2}C{sub 3}  

SciTech Connect (OSTI)

Micro-Raman spectroscopic study and lattice dynamics calculations were conducted to study a recently identified layered ternary carbide, Ti{sub 5}Al{sub 2}C{sub 3}. The experimental Raman shifts were remarkably consistent with the calculated values. Polarized Raman spectrum was collected in the polycrystalline sample, which confirmed the theoretical symmetry assignment of the Raman modes. In addition, the atomic vibrations of the peaks at 192?cm{sup ?1}, 311?cm{sup ?1}, and 660?cm{sup ?1} were identified to be the combination of the counterparts in Ti{sub 2}AlC and Ti{sub 3}AlC{sub 2}.

Zhang, H.; Li, Z. J. [Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016 (China); University of Chinese Academy of Sciences, Beijing 100049 (China); Wang, X. H. [Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016 (China); Xiang, H. M.; Zhou, Y. C, E-mail: yczhou714@gmail.com [Science and Technology of Advanced Functional Composite Laboratory, ARIMPT, No.1 South Dahongmen Road, Beijing 100076 (China)

2014-03-31T23:59:59.000Z

140

Model for projectile fragmentation: case study for Ni on Ta, Be and Xe on Al  

E-Print Network [OSTI]

For projectile fragmentation we work out details of a model whose origin can be traced back to the Bevalac era. The model positions itself between the phenomenological EPAX parametrization and microscopic transport models like "Heavy Ion Phase Space Exploration Model" (HIPSE) and antisymmetrised molecular dynamics(AMD). We apply the model to some recent data of projectile fragmentation of Ni on Ta and Be at beam energy 140 MeV/nucleon and some older data of Xe on Al at beam energy 790 MeV/nucleon. Reasonable values of cross-sections for various composites populated in the reactions are obtained.

S. Mallik; G. Chaudhuri; S. Das Gupta

2010-12-30T23:59:59.000Z

Note: This page contains sample records for the topic "ni ti al" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


141

Cold compaction study of Armstrong Process Ti-6Al-4V powders  

SciTech Connect (OSTI)

This work investigates the cold compaction behavior of Ti-6Al-4V powders produced by Armstrong Process . As-received as well as milled powders were characterized and these powders were uniaxially die-pressed at designated pressures up to 690 MPa to form disk samples with different aspect ratios. Samples with high aspect ratio exhibited non-uniform density along the pressing axis and the density distribution is in consistent with the result predicted by finite element analysis. The linear regression analysis on the experimental density data can be used to predict density of compacts with different aspect ratios. In the studied pressure range, an empirical powder compaction equation represents the green density pressure relationship very well for both the as-received and 1-hr milled Armstrong Ti-6Al-4V powders.

Chen, Wei [ORNL; Yamamoto, Yukinori [ORNL; Peter, William H [ORNL; Gorti, Sarma B [ORNL; Sabau, Adrian S [ORNL; Clark, Michael B [ORNL; Nunn, Stephen D [ORNL; Kiggans, Jim [ORNL; Blue, Craig A [ORNL; Fuller, Brian [International Titanium Powder; Akhtar, Kamal [International Titanium Powder

2011-01-01T23:59:59.000Z

142

Kinetics of ethanol oxidation on electroless Ni-P/SnO{sub 2}/Ti electrodes in KOH solutions  

SciTech Connect (OSTI)

The electrolytic oxidation of ethanol was investigated on the electroless Ni-P/SnO{sub 2}/Ti electrodes in 1M KOH. The mechanisms of ethanol oxidation on the electrode were studied via cyclic voltammetry and polarization curves. The kinetic equations were derived, and the kinetic parameters were obtained from a comparison of experimental results and the kinetic equations. The redox reaction of the nickel electrode in the alkaline-solution is reversible, and the rate constants related to this reaction, k{sub 1} as well as k{sub {minus}1}, are functions of applied potential. Ethanol oxidation on the electroless Ni-P/SnO{sub 2}/Ti is through a chemical reaction with a rate constant k{sub c1}. These rate constants were determined from the current-potential curves and the kinetic model at various concentrations of ethanol. The rate constants for electrochemical reaction could be expressed as k{sub 1} (E) = 8.892 {times} 10{sup {minus}13} exp (0.6525FE/RT) s{sup {minus}1}, k{sub {minus}1} (E) = 8,034 {times} 10{sup {minus}6} exp ({minus}0.3475FE/RT) where E was the applied potential vs. Ag/AgCl, and the chemical reaction rate constant (k{sub cl}) was 5.822 {times} 10{sup {minus}6} dm{sup 3}/mol {times} s.

Lo, Y.L.; Hwang, B.J. [National Taiwan Inst. of Technology, Taipei (Taiwan, Province of China). Dept. of Chemical Engineering

1995-02-01T23:59:59.000Z

143

Consolidation Process in Near Net Shape Manufacturing of Armstrong CP-Ti/Ti-6Al-4V Powders  

SciTech Connect (OSTI)

This paper summarizes our recent efforts to develop the manufacturing technologies of consolidated net-shape components by using new low-cost commercially pure titanium (CP-Ti) and Ti-6Al-4V alloy powders made by the Armstrong process. Fabrication processes of net shape/ near net shape components, such as uniaxial die-pressing, cold isostatic pressing (CIP), sintering, roll compaction and stamping, have been evaluated. The press-and-sinter processing of the powders were systematically investigated in terms of theoretical density and microstructure as a function of time, pressure, and temperature. Up to 96.4% theoretical density has been achieved with the press-and-sinter technology. Tensile properties of the consolidated samples exhibit good ductility as well as equivalent yield/ultimate tensile strengths to those of fully consolidate materials, even with the presence of a certain amount of porosity. A consolidation model is also under development to interpret the powder deformation during processing. Net shape components made of the Armstrong powder can successfully be fabricated with clearer surface details by using press-and-sinter processing.

Yamamoto, Yukinori [ORNL; Kiggans, Jim [ORNL; Clark, Michael B [ORNL; Nunn, Stephen D [ORNL; Sabau, Adrian S [ORNL; Peter, William H [ORNL

2010-01-01T23:59:59.000Z

144

The adhesion of electroless Ni(P) on alumina ceramic using a vacuum-deposited Ti-Pd activator layer  

SciTech Connect (OSTI)

The adhesion of electrolessly deposited nickel on Al[sub 2]O[sub 3] ceramic substrates using sputtered and evaporated Ti-Pd activator films was studied. The adhesion was measured using the direct pull-off test and the 90[degree] peel test. The morphology and the chemical composition of the fracture surfaces of the samples with evaporated Ti-Pd activator film were studied with scanning electron microscopy/energy, dispersive x-ray, and static secondary ion mass spectroscopy. Failure did not occur along the metal-ceramic interface, but mainly in the alumina, and therefore the strength of the system is determined primarily by the substrate material. Cross-sectional transmission electron microscopy and high-resolution transmission electron microscopy were used to study the interface structure before failure. The oxidation state of Ti at the interface was measured with X-ray photoelectron spectroscopy. This was carried out in the (sub)monolayer range by using a Ti wedge deposited on alumina with a maximum thickness of 0.35 nm. It is concluded that the strong adhesion at the metal-ceramic interface is caused by chemical bonding of the first Ti monolayer with substrate oxygen atoms.

Severin, J.W.; Hokke, R.; Wel, H. van der; Johnson, M.T.; With, G. de (Philips Research Labs., Eindhoven (Netherlands))

1993-06-01T23:59:59.000Z

145

E-Print Network 3.0 - area ti6al4v substrates Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

geometry can be explained by local tissue strains Summary: V parti- cles of 45150 lm in diameter to a machined Ti6Al4V substrate. The resulting porous... -surfaced design)...

146

Numerical simulation of shock initiation of Ni/Al multilayered composites  

SciTech Connect (OSTI)

The initiation of chemical reaction in cold-rolled Ni/Al multilayered composites by shock compression is investigated numerically. A simplified approach is adopted that exploits the disparity between the reaction and shock loading timescales. The impact of shock compression is modeled using CTH simulations that yield pressure, strain, and temperature distributions within the composites due to the shock propagation. The resulting temperature distribution is then used as initial condition to simulate the evolution of the subsequent shock-induced mixing and chemical reaction. To this end, a reduced reaction model is used that expresses the local atomic mixing and heat release rates in terms of an evolution equation for a dimensionless time scale reflecting the age of the mixed layer. The computations are used to assess the effect of bilayer thickness on the reaction, as well as the impact of shock velocity and orientation with respect to the layering. Computed results indicate that initiation and evolution of the reaction are substantially affected by both the shock velocity and the bilayer thickness. In particular, at low impact velocity, Ni/Al multilayered composites with thick bilayers react completely in 100?ms while at high impact velocity and thin bilayers, reaction time was less than 100??s. Quantitative trends for the dependence of the reaction time on the shock velocity are also determined, for different bilayer thickness and shock orientation.

Sraj, Ihab; Knio, Omar M., E-mail: omar.knio@duke.edu [Department of Mechanical Engineering and Materials Science, Duke University, 144 Hudson Hall, Durham, North Carolina 27708 (United States); Specht, Paul E.; Thadhani, Naresh N. [School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive, Atlanta, Georgia 30332 (United States); Weihs, Timothy P. [Department of Materials Science and Engineering, The Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland 21218 (United States)

2014-01-14T23:59:59.000Z

147

COMPARISON OF THE CORROSION BEHAVIOR OF A BULK AMORPHOUS METAL, Zr41.2Ti13.8Cu12.5Ni10Be22.5,  

E-Print Network [OSTI]

COMPARISON OF THE CORROSION BEHAVIOR OF A BULK AMORPHOUS METAL, Zr41.2Ti13.8Cu12.5Ni10Be22 exhibit excellent corrosion resistance (4­7), which has been explained in terms of their structural researchers attribute "good corrosion resistance" to the entire class of amorphous metals. It is this point

Ritchie, Robert

148

Metal-insulator transitions induced by doping in LaNiO{sub 3}: LaNi{sub 0.95}M{sub 0.05}O{sub 3} (M = Mo, W, Sb, Ti, Cu, Zn) perovskites  

SciTech Connect (OSTI)

Structural characterization and electronic properties of the LaNi{sub 0.95}M{sub 0.05}O{sub 3} (M = Mo, W, Sb, Ti, Cu, Zn) perovskite-like system are reported. These compounds can be regarded as being derived from LaNiO{sub 3} by partial substitution of Ni{sup 3+} in this material by M{sup 6+}, M{sup 5+}, M{sup 4+}, or M{sup 2+} formal cations, with a partial reduction of Ni{sup 3+} to Ni{sup 2+} taking place. X-ray powder diffraction data were analyzed by means of the Rietveld method and show that all the title materials present perovskite-type structure with a rhombohedral (S.G. R{bar 3}c) or orthorhombic (S.G. Pbnm) symmetry, depending on the nature of the M cation. In all cases, Ni and M cations are placed at random in octahedral B-sites of perovskite structure. Electrical resistivity measurements (four probe method) show metal-to-insulator (M-I) transitions for M = Mo, W, Ti, Cu, Zn at temperatures of about 50K and a semiconductor behavior for the Sb sample in the whole temperature range explored. Magnetic susceptibility measurements show the presence of weak ferromagnetic interactions for M = Sb and Pauli paramagnetism for the remaining compounds.

Alvarez, I.; Veiga, M.L.; Pico, C. [Univ. Complutense, Madrid (Spain)] [Univ. Complutense, Madrid (Spain)

1998-03-01T23:59:59.000Z

149

Composition, morphology and mechanical properties of sputtered TiAlN coating  

SciTech Connect (OSTI)

TiAlN coating was deposited on the tungsten carbide cutting tool by using DC magnetron sputtering system to study the influence of substrate bias and nitrogen flow rate on the composition, morphology and mechanical properties. The negatively substrate bias and nitrogen flow rate was varied from about ?79 to ?221 V and 30 sccm to 72 sccm, respectively. The coating composition and roughness were characterized by using SEM/EDX and Atomic Force Microscopy (AFM), respectively. The dynamic ultra micro hardness tester was used to measure the mechanical properties. The coating hardness increases to about 10-12 GPa with an increase of the negatively substrate bias up to ? 200 V and it tend to decrease with an increase in nitrogen flow rate up to 70 sccm. The increase of hardness follows the increase of Ti and N content and rms coating roughness.

Budi, Esmar, E-mail: esmarbudi@unj.ac.id [Department of Physics, Faculty of Science and Mathematics, Universitas Negeri Jakarta, Jl. Pemuda No. 10, Jakarta 13220 (Indonesia); Razali, M. Mohd. [Faculty of Manufacturing Engineering, Universiti Teknikal Malaysia Melaka, Karung Berkunci No. 1752 Pejabat Pos Durian Tunggal 76109 Melaka (Malaysia); Nizam, A. R. Md. [Faculty of Manufacturing Engineering, UniversitiTeknikal Malaysia Melaka, Karung Berkunci No. 1752 Pejabat Pos Durian Tunggal 76109 Melaka (Malaysia)

2014-03-24T23:59:59.000Z

150

Interaction of oxygen with samarium on Al{sub 2}O{sub 3} thin film grown on Ni{sub 3}Al(111)  

SciTech Connect (OSTI)

The interaction between oxygen and samarium (Sm) on the well-ordered thin Al{sub 2}O{sub 3} film grown on Ni{sub 3}Al(111) has been investigated by X-ray photoelectron spectroscopy and synchrotron radiation photoemission spectroscopy. At Sm coverage higher than one monolayer, exposure of oxygen to the Sm films at room temperature leads to the formation of both samarium peroxide (O{sub 2}{sup 2?}) states and regular samarium oxide (O{sup 2?}) states. By contrast, when exposing O{sub 2} to Sm film less than one monolayer on Al{sub 2}O{sub 3}, no O{sub 2}{sup 2?} can be observed. Upon heating to higher temperatures, these metastable O{sub 2}{sup 2?} states dissociate, supplying active O atoms which can diffuse through the Al{sub 2}O{sub 3} thin film to further oxidize the underlying Ni{sub 3}Al(111) substrate, leading to the significant increase of the Al{sub 2}O{sub 3} thin film thickness. Therefore, it can be concluded that Sm, presumably in its peroxide form, acts as a catalyst for the further oxidation of the Ni{sub 3}Al substrate by supplying the active oxygen species at elevated temperatures.

Cheng, Dingling; Xu, Qian, E-mail: qianxu@ustc.edu.cn, E-mail: jfzhu@ustc.edu.cn; Han, Yong; Ye, Yifan; Pan, Haibin; Zhu, Junfa, E-mail: qianxu@ustc.edu.cn, E-mail: jfzhu@ustc.edu.cn [National Synchrotron Radiation Laboratory and Collaborative Innovation Center of Suzhou Nano Science and Technology, University of Science and Technology of China, Hefei 230029 (China)] [National Synchrotron Radiation Laboratory and Collaborative Innovation Center of Suzhou Nano Science and Technology, University of Science and Technology of China, Hefei 230029 (China)

2014-03-07T23:59:59.000Z

151

Temperature dependence of dynamic Young's modulus and internal friction in three plasma sprayed NiCrAlY coating alloys  

E-Print Network [OSTI]

TEMPERATURE DEPENDENCE OF DYNAM'IIC YOUNG'S MODULUS AND INTERNAL FRICTION IN THREE PLASMA SPRAYED NiCrAlY COATING -ALLOYS A Thesis LLOYD STEVEN COOK Submitted to the 08ice of Graduate Studies of Texas AE M University in part. al full...'illment of the requirement for the degree of MASTER OF SCIENCE August 1989 Itiajor Subject: l'dechanical Engineering TEMPERATURE DEPENDENCE OF DYNAMIC YOUNG'S MODULUS AND INTERNAL FRICTION IN THREE PLASMA SPRAYED NiCrAIY COATING ALLOYS A Thesis by LLOYD STEVEN COOK...

Cook, Lloyd Steven

1989-01-01T23:59:59.000Z

152

In situ transmission electron microscopy investigation of the interfacial reaction between Ni and Al during rapid heating in a nanocalorimeter  

SciTech Connect (OSTI)

The Al/Ni formation reaction is highly exothermic and of both scientific and technological significance. In this report, we study the evolution of intermetallic phases in this reaction at a heating rate of 830 K/s. 100-nm-thick Al/Ni bilayers were deposited onto nanocalorimeter sensors that enable the measurement of temperature and heat flow during rapid heating. Time-resolved transmission electron diffraction patterns captured simultaneously with thermal measurements allow us to identify the intermetallic phases present and reconstruct the phase transformation sequence as a function of time and temperature. The results show a mostly unaltered phase transformation sequence compared to lower heating rates.

Grapes, Michael D., E-mail: mgrapes1@jhu.edu, E-mail: david.lavan@nist.gov, E-mail: weihs@jhu.edu [Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, Maryland 21218 (United States); Material Measurement Laboratory, Materials Measurement Science Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899 (United States); LaGrange, Thomas; Reed, Bryan W.; Campbell, Geoffrey H. [Lawrence Livermore National Laboratory, Materials Science and Technology Division, Livermore, California 94550 (United States); Woll, Karsten [Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, Maryland 21218 (United States); Institute of Applied Materials, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen (Germany); LaVan, David A., E-mail: mgrapes1@jhu.edu, E-mail: david.lavan@nist.gov, E-mail: weihs@jhu.edu [Material Measurement Laboratory, Materials Measurement Science Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899 (United States); Weihs, Timothy P., E-mail: mgrapes1@jhu.edu, E-mail: david.lavan@nist.gov, E-mail: weihs@jhu.edu [Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, Maryland 21218 (United States)

2014-11-01T23:59:59.000Z

153

The elemental interaction in the electrodeposited Pb-Sn/electroless Ni-P deposit/Al multilayer upon heat treatment  

SciTech Connect (OSTI)

The deposition of electroless nickel on aluminum is a relatively simple process. It is thus feasible to manufacture an electrodeposited solder bump on aluminum with the aid of an electroless nickel intermediate layer. The Al/electroless Ni/Pb-SN combination has been successfully developed in the present work. For this application, however, it is necessary to understand the possible interactions during protracted utilization of the multilayer combination. Nickel is reported to undergo the smallest rate of dissolution and the rate of reaction with solder among various materials is commonly applied in electronics. Thus, nickel has been applied as a diffusion barrier in electronic packaging. Electroless nickel is expected to have a similar barrier property. The interaction between nickel and electrodeposited tin forms Ni[sub 3]Sn[sub 4] at 190 C (12); Ni[sub 3]Sn is formed when the nickel surface is roughened. Ni[sub 3]Sn[sub 2] was found after soldering on electroless Ni-P. Despite all this work, there are still few investigations on the behavior of electrodeposited solder and electroless nickel deposits. The authors investigated the interphases formed in the Al/electroless Ni-P/Pb-Sn electro-deposit multilayer combination.

Lin, K.L.; Chang, J.T. (National Cheng Kung Univ., Tainan (Taiwan, Province of China). Dept. of Materials Science and Engineering)

1994-03-01T23:59:59.000Z

154

The Influence of Ni-Coated TiC on Laser-Deposited IN625 Metal Matrix Composites  

E-Print Network [OSTI]

matrix and the TiC particles, the interaction between the laser beam and TiC ceramicmatrix and the TiC particles, the interaction between the laser beam and the TiC ceramic

2010-01-01T23:59:59.000Z

155

Xe films on a decagonal Al-Ni-Co quasicrystal surface  

E-Print Network [OSTI]

The grand canonical Monte Carlo method is employed to study the adsorption of Xe on a quasicrystalline Al-Ni-Co surface. The calculation uses a semiempirical gas-surface interaction, based on conventional combining rules and the usual Lennard-Jones Xe-Xe interaction. The resulting adsorption isotherms and calculated structures are consistent with the results of LEED experimental data. In this paper we focus on five features not discussed earlier (Phys. Rev. Lett. 95, 136104 (2005)): the range of the average density of the adsorbate, the order of the transition, the orientational degeneracy of the ground state, the isosteric heat of adsorption of the system, and the effect of the vertical cell dimension.

Wahyu Setyawan; Nicola Ferralis; Renee D. Diehl; Milton W. Cole; Stefano Curtarolo

2006-08-08T23:59:59.000Z

156

Combustion synthesis of metal-matrix composites. Part 1: The Ti-TiC-Al{sub 2}O{sub 3} system  

SciTech Connect (OSTI)

Combustion synthesis or Self-propagating High-temperature Synthesis (SHS) is a process that involves a reaction which is sufficiently exothermic to sustain itself, and, as such, provides considerable potential for the development of an affordable (low cost), energetically efficient means of producing advanced materials. In the combustion synthesis process, a mix of the reactant powders, pressed into a pellet, is heated to the ignition temperature, Tig, when the exothermic reaction takes place, transforming reactants into products. The heat generated by the reaction raises the temperature of the products to a maximum recorded combustion temperature, Tc, which, under adiabatic conditions, would be the adiabatic temperature, Tad. However, in most combustion reactions, Tc is less than Tad, since heat losses occur from the reaction front. Materials synthesized with each of these combustion modes are typically associated with high levels of porosity, e.g., 50%, which is manifested as both macroporosity and microporosity. Previous work demonstrated that it was possible to decrease the porosity of a TiC-Al{sub 2}O{sub 3}-Ti composite by incorporating an excess liquid metal into the combustion synthesis reaction system. This reaction utilizes aluminothermic reduction of TiO{sub 2} to generate the exothermic condition, and at the same time, uses the required TiO{sub 2}/Al stoichiometry to provide the excess Ti to generate an excess Ti in a matrix of TiC and Al{sub 2}O{sub 3}, each of which are synthesized, in-situ within the overall reaction system.

Kunrath, A.O.; Strohaecker, T.R. [UFRGS, Porto Alegre, Rio Grande do Sul (Brazil). Dept. de Metalurgia] [UFRGS, Porto Alegre, Rio Grande do Sul (Brazil). Dept. de Metalurgia; Moore, J.J. [Colorado School of Mines, Golden, CO (United States). Dept. of Metallurgical and Materials Engineering] [Colorado School of Mines, Golden, CO (United States). Dept. of Metallurgical and Materials Engineering

1996-01-15T23:59:59.000Z

157

A transmission electron microscopy study of the deformation behavior underneath nanoindents in nano-scale Al-TiN multilayered composites  

SciTech Connect (OSTI)

Nano-scale multilayered Al-TiN composites were deposited with DC magnetron sputtering technique in two different layer thickness ratios - Al:TiN = 1:1 and Al:TiN = 9:1. The Al layer thickness varied from 2 nm to 450 nm. The hardness of the samples was tested by nanoindentation using a Berkovich tip. Cross-sectional Transmission Electron Microscopy (TEM) was carried out on samples extracted with Focused Ion Beam (FIB) from below the nanoindents. This paper presents the results of the hardness tests in the Al-TiN multilayers with the two different thickness ratios and the observations from the cross-sectional TEM studies of the regions underneath the indents. These studies showed remarkable strength in the multilayers, as well as some very interesting deformation behavior in the TiN layers at extremely small length scales, where the hard TiN layers undergo co-deformation with the Al layers.

Bhattacharyya, Dhriti [Los Alamos National Laboratory; Mara, Nathan A [Los Alamos National Laboratory; Dickerson, Patricia O [Los Alamos National Laboratory; Misra, Amit [Los Alamos National Laboratory; Hoagland, R G [Los Alamos National Laboratory

2009-01-01T23:59:59.000Z

158

In situ corrosion analysis of Al-Zn-In-Mg-Ti-Ce sacrificial anode alloy  

SciTech Connect (OSTI)

The corrosion behaviour of Al-5Zn-0.02In-1Mg-0.05Ti-0.5Ce (wt.%) alloy has been investigated by immersion test, scanning electron microscopy, energy dispersive X-ray detector, electrochemical impedance spectroscopy and electrochemical noise. The results show that there exist different corrosion types of the alloy in 3.5% NaCl solution with the immersion time. At the initial stage of immersion, pitting due to the precipitates predominates the corrosion with a typical inductive loop at low frequencies in electrochemical impedance spectroscopy. The major precipitates of the alloy are MgZn{sub 2} and Al{sub 2}CeZn{sub 2} particles. The corrosion potentials of the bulk MgZn{sub 2} and Al{sub 2}CeZn{sub 2} alloys are negative with respect to that of {alpha}-Al, so the MgZn{sub 2} and Al{sub 2}CeZn{sub 2} precipitates can act as activation centre and cause the pitting. In the late corrosion, a relative uniform corrosion predominates the corrosion process controlled by the dissolution/precipitation of the In ions and characterized by a capacitive loop at medium-high frequencies in electrochemical impedance spectroscopy. The potential noise of the pitting shows larger amplitude fluctuation and lower frequency, but the potential noise of the uniform corrosion occurs with smaller amplitude fluctuation and higher frequency.

Ma Jingling, E-mail: majingling.student@sina.com; Wen Jiuba; Zhai Wenxia; Li Quanan

2012-03-15T23:59:59.000Z

159

Tribological Characteristics of Single-phase AlMgB14 and Nanocomposite AlMgB14-TiB2 Superhard Coatings  

SciTech Connect (OSTI)

This study investigated the friction and wear characteristics of AlMgB14 and AlMgB14-TiB2 superhard coatings, produced by pulse laser deposition (PLD) and physical vapor deposition (PVD), respectively. Tests were conducted under unidirectional and reciprocating sliding against AISI 52100 bearing steel in both dry and oil-lubricated conditions. The AlMgB14 coating exhibited an encouraging but short-lived low friction stage (u = 0.2) in dry sliding. The AlMgB14-TiB2 coating reduced the wear rates by one order of magnitude for itself and three orders of magnitude for the counterface compared with the uncoated M2 tool steel in dry sliding. This nanocomposite coating also demonstrated significant extension (>2.5X) of the low friction (non-scuffing) stage in a lubricant starvation sliding.

Qu, Jun [ORNL; Blau, Peter Julian [ORNL; Zhu, Dong [Eaton Corporation; Cook, Bruce A [Ames Laboratory; Elmoursi, Alaa A [Eaton Corporation

2008-01-01T23:59:59.000Z

160

Effect of thermally stable Cu- and Mg-rich aluminides on the high temperature strength of an AlSi12CuMgNi alloy  

SciTech Connect (OSTI)

The internal architecture of an AlSi12CuMgNi piston alloy, revealed by synchrotron tomography, consists of three dimensional interconnected hybrid networks of Cu-rich aluminides, Mg-rich aluminides and eutectic/primary Si embedded in an ?-Al matrix. The strength at room temperature and at 300°C is studied as a function of solution treatment time at 490°C and compared with results previously reported for an AlSi12Ni alloy. The addition of 1 wt% Cu and 1 wt% Mg to AlSi12CuMgNi increases the room temperature strength by precipitation hardening while the strength at 300°C is similar for both alloys in as-cast condition. The strength of AlSi12CuMgNi decreases with solution treatment time and stabilizes at 4 h solution treatment. The effect of solution treatment time on the strength of the AlSi12CuMgNi alloy is less pronounced than for the AlSi12Ni alloy both at room temperature and at 300°C. - Highlights: • The 3D microstructure of AlSi12CuMgNi is revealed by synchrotron tomography. • An imaging analysis procedure to segment phases with similar contrasts is presented. • 1 wt% Cu and Mg results in the formation of 3D networks of rigid phases. • AlSi12CuMgNi is stronger than AlSi12Ni owing to the stability of the 3D networks.

Asghar, Z., E-mail: zhdasghar@yahoo.com [Materials Division, Directorate of Technology, PINSTECH, P. O. Nilore, Islamabad (Pakistan); Vienna University of Technology, Institute of Materials Science and Technology, Karlsplatz 13/308, A-1040 Vienna (Austria); Requena, G. [Vienna University of Technology, Institute of Materials Science and Technology, Karlsplatz 13/308, A-1040 Vienna (Austria); Zahid, G.H.; Rafi-ud-Din [Materials Division, Directorate of Technology, PINSTECH, P. O. Nilore, Islamabad (Pakistan)

2014-02-15T23:59:59.000Z

Note: This page contains sample records for the topic "ni ti al" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


161

The investigation of die-pressing and sintering behavior of ITP CP-Ti and Ti-6Al-4V powders  

SciTech Connect (OSTI)

This paper investigated the die-pressing and sintering behavior of the low-cost CP-Ti and Ti-6Al- 4V powders made by the Armstrong Process . The Armstrong powders have an irregular coral like, dendritic morphology, with a dendrite size of approximately 2-5 m. As-received as well as milled powders were uniaxially pressed at designated pressures up to 690 MPa to form disk samples with different aspect ratios. In the studied pressure range, an empirical powder compaction equation was applied to linearize the green density pressure relationship, and powder compaction parameters were obtained. The Armstrong Ti-64 powder exhibited a significantly higher sinterability than the CP-Ti powder. This was explained to be due to the higher diffusivity of V at the sintering temperature. The Ti-64 samples with a green density of 71.0% increased to 99.6% after sintering at 1300oC for 1 hour. An ex-situ technique was used to track the powder morphology change before and after sintering.

Chen, Wei [ORNL; Yamamoto, Yukinori [ORNL; Peter, William H [ORNL; Clark, Michael B [ORNL; Nunn, Stephen D [ORNL; Kiggans, Jim [ORNL; Muth, Thomas R [ORNL; Blue, Craig A [ORNL; Williams, James C [Ohio State University; Fuller, Brian [International Titanium Powder; Akhtar, Kamal [International Titanium Powder

2012-01-01T23:59:59.000Z

162

Role of interface structure and chemistry in resistive switching of NiO nanocrystals on SrTiO{sub 3}  

SciTech Connect (OSTI)

Nickel oxide (NiO) nanocrystals epitaxially grown on (001) strontium titanate (SrTiO{sub 3}) single crystal substrates were characterized to investigate interface morphology and chemistry. Aberration corrected high angle annular dark field scanning transmission electron microscopy reveals the interface between the NiO nanocrystals and the underlying SrTiO{sub 3} substrate to be rough, irregular, and have a lower average atomic number than the substrate or the nanocrystal. Energy dispersive x-ray spectroscopy and electron energy loss spectroscopy confirm both chemical disorder and a shift of the energy of the Ti L{sub 2,3} peaks. Analysis of the O K edge profiles in conjunction with this shift, implies the presence of oxygen vacancies at the interface. This sheds light into the origin of the previously postulated minority carriers’ model to explain resistive switching in NiO [J. Sullaphen, K. Bogle, X. Cheng, J. M. Gregg, and N. Valanoor, Appl. Phys. Lett. 100, 203115 (2012)].

Cheng, Xuan; Sullaphen, Jivika; Valanoor, Nagarajan [School of Materials Science and Engineering, University of New South Wales, Sydney NSW 2052 (Australia); Weyland, Matthew [Department of Materials Engineering and Monash Centre for Electron Microscopy, Monash University, Melbourne VIC 3800 (Australia); Liu, Hongwei [Australian Centre for Microscopy and Microanalysis, University of Sydney, Sydney NSW 2006 (Australia)

2014-03-01T23:59:59.000Z

163

Quadrupole mass spectrometry and time-of-flight analysis of ions resulting from 532 nm pulsed laser ablation of Ni, Al, and ZnO targets  

SciTech Connect (OSTI)

This work describes the design and validation of an instrument to measure the kinetic energies of ions ejected by the pulsed laser ablation (PLA) of a solid target. Mass spectra show that the PLA of Ni, Al, and ZnO targets, in vacuum, using the second harmonic of a Nd:YAG laser (532 nm, pulse duration {approx}10 ns) generates abundant X{sup n+} ions (n{<=}3 for Ni, {<=}2 for Al, {<=}3 and {<=}2 for Zn and O respectively from ZnO). Ions are selected by their mass/charge (m/z) ratio prior to the determination of their times of flight. PLA of Ni has been studied in most detail. The mean velocities of ablated Ni{sup n+} ions are shown to follow the trend v(Ni{sup 3+})>v(Ni{sup 2+})>v(Ni{sup +}). Data from Ni{sup 2+} and Ni{sup 3+} are fitted to shifted Maxwellian functions and agree well with a model which assumes both thermal and Coulombic contributions to ion velocities. The dependence of ion velocities on laser pulse energy (and fluence) is investigated, and the high energy data are shown to be consistent with an effective accelerating voltage of {approx}90 V within the plume. The distribution of velocities associated with Ni{sup 3+} indicates a population at cooler temperature than Ni{sup 2+}.

Sage, Rebecca S.; Cappel, Ute B.; Ashfold, Michael N. R.; Walker, Nicholas R. [School of Chemistry, University of Bristol, Bristol BS8 1TS (United Kingdom)

2008-05-01T23:59:59.000Z

164

The in?uence of Al:Nb ratio on the microstructure and mechanical response of quaternary Ni–Cr–Al–Nb alloys  

E-Print Network [OSTI]

the CC BY license (http://creativecommons.org/licenses/by/3.0/). 1. Introduction To comply with increasingly stringent aerospace emissions targets [1,2] gas turbine engine manufacturers are seeking to improve engine efficiency. Engine performance can... of gas turbine engines. Nickel-base superalloys typically consist of an A1 (Strukturber- icht notation) matrix (?) solid solution, reinforced with a distribu- tion of coherent Ni3Al, L12 superlattice precipitates (?0). Within the microstructure there can...

Mignanelli, P.M.; Jones, N.G.; Hardy, M.C.; Stone, H.J.

2014-05-17T23:59:59.000Z

165

Microstructure characterization of laser welded Ti-6Al-4V fusion zones  

SciTech Connect (OSTI)

The as-welded microstructure of laser-welded Ti-6Al-4V is characterized as a function of CO2 key-hole mode laser welding speed. Martensitic ?? is the predominant phase, with some ? and retained ?. Phase transformation is affected by the cooling rate through laser welding speed. A higher welding speed of 1.6 to 2.0 m/min produced more martensite ?? and less retained ? in the welds. 1.4 m/min welding speed produced small amounts of ?, besides the martensite ??. A trace of ? titanium hydride phase seems to have formed in the weld fusion zone. Moiré fringes are a common feature in the TEM microstructure, due to abundance of multi-phase interfaces. Tensile twins and clusters of dislocations indicate that plastic deformation has happened in the as-welded microstructure, indicating the local stress levels to be approaching the yield stress on-cooling during laser welding.

Xu, Pei-quan; Li, Leijun, E-mail: leijun.li@ualberta.ca; Zhang, Chunbo

2014-01-15T23:59:59.000Z

166

Processing of the intermetallic matrix composite Ni[sub 76]Al[sub 23. 9]B[sub 0. 1]/[alpha]-Al[sub 2]O[sub 3] from nickel-plated alumina powder  

SciTech Connect (OSTI)

The nickel aluminide intermetallic compound Ni[sub 3]Al exhibits many extraordinary properties. In addition, the intrinsic brittleness of the polycrystalline Ni[sub 76]Al[sub 24] compound at ambient temperatures is eliminated by microalloying with boron (B 0.1 percent). In the present report the authors demonstrate a new approach to prepare Ni[sub 76]Al[sub 23.9]B[sub 0.1]/[alpha]-Al[sub 2]O[sub 3] IMC from electroless nickel-boron-plated [alpha]-Al[sub 2]O[sub 3] powder mixed with Ni and Al powder and sintered. Expensive facilities, i.e. HIP and vacuum HP etc., are unnecessary, but ductile fracture behavior and excellent elongation are observed.

Chiou, W.C.; Hu, C.T. (National Tsing Hua Univ., Hsinchu (Taiwan, Province of China). Dept. of Materials Science and Engineering)

1994-09-01T23:59:59.000Z

167

Interatomic potentials for atomistic simulations of the Ti-Al system Rajendra R. Zope and Y. Mishin*  

E-Print Network [OSTI]

In recent years, intermetallic alloys based on the gamma titanium aluminide TiAl have been the subject properties such as the nature of interatomic bonding, stability of crystal structures, elastic properties, dis- locations, grain boundaries, interfaces, as well as point de- fects and diffusion is therefore

Mishin, Yuri

168

Long period structures in Ti1+xAl3-x alloys : experimental evidence of a devil's staircase ?  

E-Print Network [OSTI]

595 Long period structures in Ti1+xAl3-x alloys : experimental evidence of a devil's staircase ? A of a so-called devil's staircase. The experimental results are compared with those obtained in Ag3Mg domain size M depends on temperature; this dependence corresponds to a simple (harmless) staircase below

Boyer, Edmond

169

Electronic and atomic structures of Ti{sub 1-x}Al{sub x}N thin films related to their damage behavior  

SciTech Connect (OSTI)

Ti and Al K-edge x-ray absorption spectroscopy is used to investigate the electronic structure of Ti{sub 1-x}Al{sub x}N thin films deposited by reactive magnetron sputtering. The experimental near edge spectra of TiN and AlN are interpreted in the light of unoccupied density of state band structure calculations. The comparison of the structural parameters derived from x-ray absorption fine structure and x-ray diffraction reveals segregation between Al-rich and Ti-rich domains within the Ti{sub 1-x}Al{sub x}N films. Whereas x-ray diffraction probes only the crystallized domains, the structural information derived from extended x-ray absorption fine structure analysis turns on both crystalline and grain boundaries. The results are discussed by considering the damage behavior of the films depending on the composition.

Tuilier, M.-H.; Pac, M.-J.; Girleanu, M.; Covarel, G.; Arnold, G.; Louis, P. [Laboratoire de Mecanique, Materiaux et Procedes de Fabrication, Universite de Haute Alsace, 61 rue Albert Camus, F-68093 Mulhouse cedex (France); Rousselot, C. [Institut FEMTO-ST (UMR CNRS 6174), Universite de Franche-Comte, BP 71427, F-25211 Montbeliard cedex (France); Flank, A.-M. [CNRS--UR1 SOLEIL, F-91192 Gif sur Yvette cedex (France)

2008-04-15T23:59:59.000Z

170

Microstructural aspects of low-pressure plasma-sprayed CoNiCrAlY coating on Hastelloy X  

SciTech Connect (OSTI)

A Co-32Ni-21Cr-8Al-0.5Y alloy coating plasma sprayed on Hastelloy X. The microstructure of the coating layer consist of ..gamma.. phase solid solution, ..gamma..' phase, and Y-rich intermetallic phase. This coating exhibits excellent oxidation and sulfidation resistance after exposure in air and in sodium sulfate at 1,000/sup 0/C for 60 h, due to the formation of ..cap alpha..-Al/sub 2/O/sub 3/ oxide scale. However, the presence of chloride in the sodium sulfate leads to rupture of the aluminium oxide scale, and this results in the precipitation of chlorides and sulfides within the coating layer.

Tjong, S.C.; Shih, G.E.; Ho, N.J.

1989-01-01T23:59:59.000Z

171

Effect of Pt promotion on Ni/Al{sub 2}O{sub 3} for the selective catalytic reduction of NO with hydrogen  

SciTech Connect (OSTI)

Ni/Al{sub 2}O{sub 3} (10 wt.% Ni) and Ni-Pt/Al{sub 2}O{sub 3} (10 wt.% Ni, 0.5 wt.% Pt) were comparatively tested in the hydrogen selective catalytic reduction process (H{sub 2}-SCR), at reaction temperatures below 350°C. Catalytic activity tests consisted in temperature programmed reactions (TPRea) under plug flow conditions from 50 to 350°C, with a temperature rate of 5°C/min, using a feed stream with a reactant ratio NO:H{sub 2}?=?1:1.3 and a GHSV of 4500 h{sup ?1}. Promotion with Pt increases the catalytic performances of the Ni based catalyst, in respect to NO conversion, N{sub 2} selectivity and N{sub 2} yield. The reaction temperatures for NO conversion above 95% decrease significantly due to Pt addition, from 250°C for Ni/Al{sub 2}O{sub 3} to 125°C for Ni-Pt/Al{sub 2}O{sub 3}. Characterization of catalysts was performed by: X ray powder diffraction (XRD) for the estimation of Ni crystallite size, temperature programmed reduction (TPR) for the catalyst reducibility, temperature programmed desorption of hydrogen (H{sub 2}-TPD) for the investigation of active sites and metal dispersion on the support, N{sub 2} adsorption-desorption isotherms at ?196°C for the determination of total specific surface area and pore size distribution, and H/D isotopic exchange on the catalyst surface.

Mihet, Maria, E-mail: maria.mihet@itim-cj.ro; Lazar, Mihaela D., E-mail: maria.mihet@itim-cj.ro; Borodi, G., E-mail: maria.mihet@itim-cj.ro; Almasan, V., E-mail: maria.mihet@itim-cj.ro [National Institute for Research and Development of Isotopic and Molecular Technologies-INCDTIM, 65-103 Donath Str., 400293 Cluj-Napoca (Romania)

2013-11-13T23:59:59.000Z

172

Ann bay lodyans 14 / Se Bryant Freeman ("Tonton Liben") ki pare ti liv sa a  

E-Print Network [OSTI]

chante. A! chwal pati, men krapo pi vif pase I. Li bondi al tache nan gwo ke chwal la. F6 nou te we chwal kouri tout boulin. Li voltije ni rigol ni lantiray. Le li bouke, li fe yon ti rete. 10 Men, tou dousman, krapo fe yon ti "ef-6f." Chwal sezi... chwal, fe yon ti "ef-df" anko. Chwal rele: "Sa pa posib!" Epi li komanse galope vites boulin pou I ka rive pi vit. Nan yon ti moman, li paret nan bouk la. Men kay Melani. Chwal rele: "Cheri! cheri!" Yo tande vwa li. Tout moun vini pou yo ka resevwa...

Freeman, Bryant C.

2000-01-01T23:59:59.000Z

173

Ab-initio First Principle Modeling of Structural and Magnetic Phase Transformations in Co-Ni-Al Based Shape Memory Alloys  

E-Print Network [OSTI]

. These magnetic properties are mainly attributed to the martensitic structural phase trans- formation these material experience in response to temperature variation. Co-Ni-Al based alloys are one of the most promising ferromagnetic shape memory alloy FSMA that has...

Thawabi, Hassan S

2013-04-16T23:59:59.000Z

174

PII S0016-7037(98)00136-7 The kinetics of mixed Ni-Al hydroxide formation on clay and aluminum oxide minerals  

E-Print Network [OSTI]

PII S0016-7037(98)00136-7 The kinetics of mixed Ni-Al hydroxide formation on clay and aluminum. This finding indicates that the dissolution of clay and aluminum oxide minerals can be promoted by metal ions

Sparks, Donald L.

175

Demonstration of High Efficiency Elastocaloric Cooling with Large Delta- T Using NiTi Wires  

SciTech Connect (OSTI)

Vapor compression (VC) is by far the most dominant technology for meeting all cooling and refrigeration needs around the world. It is a mature technology with the efficiency of modern compressors approaching the theoretical limit, but its envi-ronmental footprint remains a global problem. VC refrigerants such as hydrochlo-roflurocarbons (HCFCs) and hydrofluorocarbons (HFCs) are a significant source of green house gas (GHG) emissions, and their global warming potential (GWP) is as high as 1000 times that of CO2. It is expected that building space cooling and re-frigeration alone will amount to {approx} 5% of primary energy consumption and {approx}5% of all CO2 emission in U.S. in 2030 . As such, there is an urgent need to develop an al-ternative high-efficiency cooling technology that is affordable and environmentally friendly. Among the proposed candidates, magnetocaloric cooling (MC) is currently received a lot of attention because of its high efficiency. However, MC is inherently expensive because of the requirement of large magnetic field and rare earth materi-als. Here, we demonstrate an entirely new type of solid-state cooling mechanism based on the latent heat of reversible martensitic transformation. We call it elasto-caloric cooling (EC) after the superelastic transformation of austenite it utilizes. The solid-state refrigerant of EC is cost-effective, and it completely eliminates the use of any refrigerants including HCFCs/HFCs. We show that the COP (coefficient of per-formance) of a jugular EC with optimized materials can be as high as > 10 with measured {Delta}T of 17 C.

Cui, Jun; Wu, Yiming; Muehlbauer, Jan; Hwang, Yunho; Radermacher, Reinhard; Fackler, Sean; Wuttig, Manfred; Takeuchi, Ichiro

2012-08-01T23:59:59.000Z

176

Photoconductivity and Non-Exponential Relaxation at Insulating LaAlO3/SrTiO3 Interfaces  

SciTech Connect (OSTI)

LaAlO{sub 3} is grown on SrO terminated (100) SrTiO{sub 3}, and (110) SrTiO{sub 3}, producing insulating heterointerfaces without light. Photocurrent spectroscopy at low temperatures reveals a broad distribution of interface states between 2 eV and 2.7 eV at both interfaces, with a higher density in the (110) case concomitant with relatively shallow traps. The photocurrent relaxation can be well fitted by a stretched exponential form, confirming energetically distributed electron traps. Photo-carrier lifetimes are larger than a few hundred seconds for optical excitation approaching the SrTiO{sub 3} band-gap energy, providing the opportunity to study transient light-induced properties at low temperatures.

Kim, Minu; Bell, C.; Hikita, Y.; Kozuka, Y.; Kim, B.G.; Hwang, H.Y.

2012-08-17T23:59:59.000Z

177

Structure Analysis of a Precipitate Phase in an Ni-Rich High...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Structure Analysis of a Precipitate Phase in an Ni-Rich High Temperature NiTiHf Shape Memory Alloy. Structure Analysis of a Precipitate Phase in an Ni-Rich High Temperature NiTiHf...

178

Mechanisms Associated with Rumpling of Pt-Modified Beta-NiAl Coatings  

SciTech Connect (OSTI)

The formation of surface undulations (i.e. rumpling) at the bond coat/thermally grown oxide (TGO) interface has been shown to cause failure by spallation of the ceramic top coat in aero-turbine systems. Many mechanisms have been proposed concerning the cause of these surface distortions; however, there is little agreement on what may be the dominating cause of the rumpling behavior. Of there mechanisms, the reversible phase transformation from a cubic {beta}-NiAl structure to a face centered tetragonal (FCT) martensitic phase was of particular interest because of its ability to form surface rumpling in Pt-modified {beta} bulk alloys. However, the bulk alloys used in obtaining that result were simple ternary systems and not relevant to actual coating compositions as other alloying elements enter the coating due to coating/substrate interdiffusion at high temperature. In the current study, the depletion behavior of a commercial coating was studied. Compositions from the depletion path were determined and bulk alloys representing these coating compositions were prepared. The martensitic phase transformation was then characterized using DSC and XRD. The martensitic start temperature on cooling, Ms, was consistently found to be significantly lower than previously reported values (e.g. 530 C vs 100 C). Because of the low Ms temperature, the formation of the martensitic phase was concluded to be unnecessary for the occurrence of rumpling. However, cyclic exposure treatments at low temperature ({approx} 400 C) of bulk alloys and commercial coatings did show the detrimental effects of the phase transformation in the form of crack formation and propagation leading to eventual failure of the alloys. The current work also infers that the differences in coefficient of thermal expansion (CTE) mismatch between the coating and substrate are the dominating factor leading to rumpling. Dilatometry measurements were made on bulk alloys representing depleted coatings and the superalloy substrate to determine CTE as a function of temperature. Finally, simulations were completed to help determine the role of CTE mismatch. It was found that these results compared closely to those collected during experimental cyclic exposure treatments; although, modification to the current model were found to be needed in order to truly simulate rumpling.

Joseph Peter Henderkott

2007-12-01T23:59:59.000Z

179

Arc distribution during the vacuum arc remelting of Ti-6Al-4V  

SciTech Connect (OSTI)

Currently, the temporal distribution of electric arcs across the ingot during vacuum arc remelting (VAR) is not a known or monitored process parameter. Previous studies indicate that the distribution of arcs can be neither diffuse nor axisymmetric about the center of the furnace. Correct accounting for the heat flux, electric current flux, and mass flux into the ingot is critical to achieving realistic solidification models of the VAR process. The National Energy Technology Laboratory has developed an arc position measurement system capable of locating arcs and determining the arc distribution within an industrial VAR furnace. The system is based on noninvasive magnetic field measurements and a VAR specific form of the Biot–Savart law. The system was installed on a coaxial industrial VAR furnace at ATI Albany Operations in Albany, OR. This article reports on the different arc distributions observed during production of Ti-6Al-4V. It is shown that several characteristic arc distribution modes can develop. This behavior is not apparent in the existing signals used to control the furnace, indicating the measurement system is providing new information. It is also shown that the different arc distribution modes observed may impact local solidification times, particularly at the side wall.

Woodside, Charles Rigel [U.S. DOE; King, Paul E. [U.S. DOE; Nordlund, Chris [ATI Albany Operations

2013-01-01T23:59:59.000Z

180

High-temperature phase transformation in Cr added TiAl base alloy  

SciTech Connect (OSTI)

The authors have investigated a microstructure evolution of a Ti-48Al-3.5Cr (in at.%) alloy at high-temperatures ({gt} 1,473K). In the alloy annealed at 1673K for 1.8ks, followed by air-cooling, a characteristic microstructure with a feathery fashion was uniformly formed. From a cooling-rate-controlling study, it was found that formation of the feathery structure is accomplished during continuous cooling from 1673K to 1573K, within the {alpha} + {gamma} two-phase region. Transmission electron microscopy revealed that the feathery structure is composed of lamellar colonies (5--10{micro}m) which are crystallographically tilted slightly (a few degree) with their neighbors. A surprising fact is that lamellae in each colony are mostly the {gamma} phase with few {alpha}{sub 2} phase less than 5% in volume. This suggests that the feathery structure is a metastable product and has not resulted from the {alpha} {r{underscore}arrow} {alpha} + {gamma} transformation above 1,573 K. Instead, the feathery structure formation should be attributed to the non-equilibrium {alpha} {r{underscore}arrow} {gamma} transformation which occurs at high-temperatures with a small degree of supercooling. The authors discuss this interesting phase transformation in terms of the {alpha} {r{underscore}arrow} {gamma} massive transformation, based on the continuous-cooling-transformation (CCT) diagram constructed for the present alloy.

Abe, E.; Niinobe, K.; Nobuki, M.; Nakamura, M.; Tsujimoto, T.

1999-07-01T23:59:59.000Z

Note: This page contains sample records for the topic "ni ti al" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


181

XRCT characterisation of Ti particles inside porous Al{sub 2}O{sub 3}  

SciTech Connect (OSTI)

Computed X-ray tomography was used to characterise distribution and sphericity of Ti granules within highly porous (> 35%) Al{sub 2}O{sub 3} powder compacts, as they are key parameters for a successful infiltration by Fe-based alloys. Setting of reconstruction constraints, image editing as well as data processing are the most challenging parts of computed X-ray tomography and principal sources of errors that bias the generated data. Thus, corrective measures have to be applied and the reliability of generated data has to be proved with respect to statistical, stereological and volumetric aspects. Combining an adapted Interface Particle Treatment Algorithm with the Marching Cube Method, Equilibrium Random State Model, cluster splitting and conventional laser diffraction measurements a significant improvement of the three-dimensional reconstructed data was achieved. This study points out the need of the applied algorithms for the proof and improvement of generated data by computed X-ray tomography and gives a short survey of methods that can be applied.

Vasic, S., E-mail: srdan.vasic@unifr.ch [Technical Mineralogy Group, Institute of Mineralogy and Petrography, University of Fribourg, CH-1700 Fribourg (Switzerland); Empa, Swiss Federal Laboratories for Materials Testing and Research, Laboratory for High Performance Ceramics, Ueberlandstrasse 129, CH-8600 Duebendorf (Switzerland); Grobety, B. [Technical Mineralogy Group, Institute of Mineralogy and Petrography, University of Fribourg, CH-1700 Fribourg (Switzerland); Kuebler, J., E-mail: jakob.kuebler@empa.ch [Empa, Swiss Federal Laboratories for Materials Testing and Research, Laboratory for High Performance Ceramics, Ueberlandstrasse 129, CH-8600 Duebendorf (Switzerland); Graule, T. [Empa, Swiss Federal Laboratories for Materials Testing and Research, Laboratory for High Performance Ceramics, Ueberlandstrasse 129, CH-8600 Duebendorf (Switzerland); Baumgartner, L. [Institute of Mineralogy and Petrography, Earth Science, University of Lausanne, CH-1100 Lausanne (Switzerland)

2010-06-15T23:59:59.000Z

182

Silicide precipitation in a {gamma}-based Ti-47Al-2W-0.5Si alloy  

SciTech Connect (OSTI)

Although some work on microstructure of silicides in {gamma}-TiAl alloys has been done, it is restricted to the alloys containing high content of silicon ({approximately}3at.%). Furthermore, to the authors` knowledge, the crystal orientation relation between silicide and {beta} matrix that is stabilized to room temperature in the alloys containing transition elements (such as Nb, V, W, Cr), has not been reported yet. The present investigation was undertaken /to study the silicides in a {gamma}-TiAl base alloy with 2 at.% W addition containing 0.28--0.59 at.% Si after different heat treatments, to understand the effects of silicon content and heat treatment on the formation and morphology of silicides.

Yin, W.M. [CNR-ITM, Cinisello Balsamo (Italy)] [CNR-ITM, Cinisello Balsamo (Italy); [Chinese Academy of Sciences, Shenyang (China). Inst. of Metal Research; Lupinc, V. [CNR-ITM, Cinisello Balsamo (Italy)] [CNR-ITM, Cinisello Balsamo (Italy)

1997-07-15T23:59:59.000Z

183

Influence of Microstructure on High-Cycle Fatigue of Ti-6Al-4V: Bimodal vs. Lamellar Structures  

E-Print Network [OSTI]

for such failures in Ti-6Al-4V, a commonly used turbine blade alloy, specifically for fan and compressor blades.K. NALLA, B.L. BOYCE, J.P. CAMPBELL, J.O. PETERS, and R.O. RITCHIE The high-cycle fatigue (HCF) of titanium] HCF can result in essentially unpredictable used for blade and disk applications in the front (low

Ritchie, Robert

184

Fabricating superconducting interfaces between artificially grown LaAlO{sub 3} and SrTiO{sub 3} thin films  

SciTech Connect (OSTI)

Realization of a fully metallic two-dimensional electron gas (2DEG) at the interface between artificially grown LaAlO{sub 3} and SrTiO{sub 3} thin films has been an exciting challenge. Here we present for the first time the successful realization of a superconducting 2DEG at interfaces between artificially grown LaAlO{sub 3} and SrTiO{sub 3} thin films. Our results highlight the importance of two factors—the growth temperature and the SrTiO{sub 3} termination. We use local friction force microscopy and transport measurements to determine that in normal growth conditions the absence of a robust metallic state at low temperature in the artificially grown LaAlO{sub 3}/SrTiO{sub 3} interface is due to the nanoscale SrO segregation occurring on the SrTiO{sub 3} film surface during the growth and the associated defects in the SrTiO{sub 3} film. By adopting an extremely high SrTiO{sub 3} growth temperature, we demonstrate a way to realize metallic, down to the lowest temperature, and superconducting 2DEG at interfaces between LaAlO{sub 3} layers and artificially grown SrTiO{sub 3} thin films. This study paves the way to the realization of functional LaAlO{sub 3}/SrTiO{sub 3} superlattices and/or artificial LaAlO{sub 3}/SrTiO{sub 3} interfaces on other substrates.

Li, Danfeng, E-mail: Danfeng.Li@unige.ch; Gariglio, Stefano; Cancellieri, Claudia; Fęte, Alexandre; Stornaiuolo, Daniela; Triscone, Jean-Marc [DPMC, University of Geneva, 24 Quai Ernest Ansermet, 1211 Geneva (Switzerland)

2014-01-01T23:59:59.000Z

185

Catalytic Effect of Ti for Hydrogen Cycling in NaAlH4  

Broader source: Energy.gov (indexed) [DOE]

+ 2AlH 3 3 NaAlH 4 M. Mamula et al., Coll. Czechoslov. Chem. Commun. 32, 884 (1967). Atomic Hydrogen Interacting with Al Surfaces "H adsorption and the formation of alane...

186

On the preparation of TiAl alloy by direct reduction of the oxide mixtures in calcium chloride melt  

SciTech Connect (OSTI)

In recent years, TiAl-based intermetallic alloys are being increasingly considered for application in areas such as (i) automobile/transport sector (passenger cars, trucks and ships) (ii) aerospace industry (jet engines and High Speed Civil Transport propulsion system) and (iii) industrial gas turbines. These materials offer excellent (i) high temperature properties (at higher than 6000C) (ii) mechanical strength and (iii) resistance to corrosion and as a result have raised renewed interest. The combination of these properties make them possible replacement materials for traditional nickel-based super-alloys, which are nearly as twice as dense (than TiAl based alloys). Since the microstructures of these intermetallic alloys affect, to a significant extent, their ultimate performance, further improvements (by way of alteration/modification of these microstructures), have been the subject matter of intense research investigations. It has now been established that the presence of alloy additives, such as niobium, tantalum, manganese, boron, chromium, silicon, nickel and yttrium etc, in specific quantities, impart marked improvement to the properties, viz. fatigue strength, fracture toughness, oxidation resistance and room temperature ductility, of these alloys. From a number of possible alloy compositions, {gamma}-TiAl and Ti-Al-Nb-Cr have, of late, emerged as two promising engineering alloys/materials. . The conventional fabrication process of these alloys include steps such as melting, forging and heat treatment/annealing of the alloy compositions. However, an electrochemical process offers an attractive proposition to prepare these alloys, directly from the mixture of the respective oxides, in just one step. The experimental approach, in this new process, was, therefore, to try to electrochemically reduce the (mixed) oxide pellet to an alloy phase. The removal of oxygen, from the (mixed) oxide pellet, was effected by polarizing the oxide pellet against a graphite electrode in a pool of molten calcium chloride at a temperature of 9000C. The dominant mechanism of the oxygen removal was the ionization of oxygen followed by its subsequent discharge, as CO2/CO, at the anode surface. The removal of oxygen from the oxide mixture helped form the alloy in situ. The presentation shall cover the detailed experimental results pertaining to the preparation, evaluation and characterization of Ti-47Al-2Nb-2Cr (atom%) alloy.

Prabhat K. Tripathy; Derek J. Fray

2011-11-01T23:59:59.000Z

187

NON-CONTACT ACOUSTO-THERMAL SIGNATURES OF PLASTIC DEFORMATION IN TI-6AL-4V  

SciTech Connect (OSTI)

Plastic deformation introduces changes in a material which include increases in: dislocations, strains, residual stress, and yield stress. However, these changes have a very small impact on the material properties such as elastic modulus, conductivity and ultrasonic wave speed. This is due to the fact that interatomic forces govern these properties, and they are not affected by plastic deformation to any large degree. This is evident from the fact that the changes in electrical resistance and ultrasonic velocity in plastically deformed and virgin samples are very small and can only be determined by highly controlled experiments. Except for X-ray diffraction, there are no direct nondestructive methods for measuring strain and the residual stress. This paper presents an application of the non-contact acousto-thermal signature (NCATS) NDE methodology to detect plastic deformation in flat dog bone Ti-6Al-4V samples. Results of the NCATS measurements on samples subjected to incremental amounts of plastic deformation are presented. The maximum temperature attained by the sample due to acoustic excitation is found to be sensitive to the amount of plastic strain. It is observed that the temperature induced by acoustic excitation increases to a peak followed by a decrease to failure. The maximum temperature peak occurs at plastic strains of 12-14%. It is observed that there is a correlation between the peak in maximum temperature rise and the strain at the experimentally determined ultimate tensile strength. A microstructural based explanation for this will be presented. The results are discussed in reference to utilizing this technique for detection and evaluation of plastic deformation.

Welter, J. T.; Jata, K. V.; Blodgett, M. P. [Materials and Manufacturing Directorate, Nondestructive Evaluation Branch Wright-Patterson AFB, OH 45433 (United States); Malott, G. [SOCHE, 3155 Research Blvd, Dayton, OH 45420 (United States); Schehl, N.; Sathish, S. [Structural Integrity Division, University of Dayton Research Institute, Dayton, OH 45469 (United States)

2010-02-22T23:59:59.000Z

188

Materials Science and Engineering A311 (2001) 8399 Combustion synthesis/densification of an Al2O3 TiB2 composite  

E-Print Network [OSTI]

2000 Abstract The self-propagating gasless combustion reaction 3TiO2 +3B2O3 +10Al5Al2O2 +3TiB2 was used of reaction. The densification was enabled by the high temperatures produced by the combustion reaction (:2000 studied in the US [5­11] and Japan [12­16]. A self-propagating gasless (virtually) combustion wave

Meyers, Marc A.

189

Mg{sub 8}Rh{sub 4}B - A new type of boron stabilized Ti{sub 2}Ni structure  

SciTech Connect (OSTI)

The new magnesium rhodium boron compound Mg{sub 8}Rh{sub 4}B has been synthesized by reaction of the metal powders with crystalline or amorphous boron or the RhB precursor. The crystal structure of Mg{sub 8}Rh{sub 4}B was solved using single-crystal X-ray diffraction data (space group Fd3-bar m, a=12.1711(4)A, Z=8, 174 reflections, R{sub F}=0.016). The crystal structure can be described as a filled Ti{sub 2}Ni type where the interstitial sites 8b (12,12,12), located at the center of two nested Mg{sub 4}Rh{sub 4} tetrahedra, are occupied by boron atoms. Taking into account the absence of the Ti{sub 2}Ni-type phase in the binary Mg-Rh system, the boron atoms can be considered as stabilizing this structural motif. From the bonding analysis with the electron localization function the crystal structure is described as covalently bonded [Rh{sub 4}B]{sup 3-} anions, embedded in a cationic magnesium matrix.

Alekseeva, A.M. [Max-Planck-Institut fuer Chemische Physik fester Stoffe, Noethnitzer Strasse 40, 01187 Dresden (Germany) and Department of Chemistry, Moscow State University, Moscow 119992 (Russian Federation)]. E-mail: alekseev@cpfs.mpg.de; Abakumov, A.M. [Max-Planck-Institut fuer Chemische Physik fester Stoffe, Noethnitzer Strasse 40, 01187 Dresden (Germany); Department of Chemistry, Moscow State University, Moscow 119992 (Russian Federation); EMAT, University of Antwerp, Antwerp B-2020 (Belgium); Leithe-Jasper, A. [Max-Planck-Institut fuer Chemische Physik fester Stoffe, Noethnitzer Strasse 40, 01187 Dresden (Germany); Schnelle, W. [Max-Planck-Institut fuer Chemische Physik fester Stoffe, Noethnitzer Strasse 40, 01187 Dresden (Germany); Prots, Yu. [Max-Planck-Institut fuer Chemische Physik fester Stoffe, Noethnitzer Strasse 40, 01187 Dresden (Germany); Chizhov, P.S. [Max-Planck-Institut fuer Chemische Physik fester Stoffe, Noethnitzer Strasse 40, 01187 Dresden (Germany); Department of Chemistry, Moscow State University, Moscow 119992 (Russian Federation); Van Tendeloo, G. [EMAT, University of Antwerp, Antwerp B-2020 (Belgium); Antipov, E.V. [Department of Chemistry, Moscow State University, Moscow 119992 (Russian Federation); Grin, Yu. [Max-Planck-Institut fuer Chemische Physik fester Stoffe, Noethnitzer Strasse 40, 01187 Dresden (Germany)

2006-09-15T23:59:59.000Z

190

Substrate orientation effects on the nucleation and growth of the M{sub n+1}AX{sub n} phase Ti{sub 2}AlC  

SciTech Connect (OSTI)

The M{sub n+1}AX{sub n} (MAX) phases are ternary compounds comprising alternating layers of a transition metal carbide or nitride and a third ''A-group'' element. The effect of substrate orientation on the growth of Ti{sub 2}AlC MAX phase films was investigated by studying pulsed cathodic arc deposited samples grown on sapphire cut along the (0001), (1010), and (1102) crystallographic planes. Characterization of these samples was by x-ray diffraction, atomic force microscopy, and cross-sectional transmission electron microscopy. On the (1010) substrate, tilted (1018) growth of Ti{sub 2}AlC was found, such that the TiC octahedra of the MAX phase structure have the same orientation as a spontaneously formed epitaxial TiC sublayer, preserving the typical TiC-Ti{sub 2}AlC epitaxial relationship and confirming the importance of this relationship in determining MAX phase film orientation. An additional component of Ti{sub 2}AlC with tilted fiber texture was observed in this sample; tilted fiber texture, or axiotaxy, has not previously been seen in MAX phase films.

Tucker, Mark D.; Guenette, Mathew C.; Bilek, Marcela M. M.; McKenzie, David R. [School of Physics, University of Sydney, New South Wales 2006 (Australia); Persson, Per O. A.; Rosen, Johanna [School of Physics, University of Sydney, New South Wales 2006 (Australia); Thin Film Physics, Linkoepings Universitet, 58183 Linkoeping (Sweden)

2011-01-01T23:59:59.000Z

191

Comparative Studies on Temperature Dependent I-V Characteristics of Al/(p)CdTe and Ni/(n)CdS Schottky Junctions and Their PV Effect  

SciTech Connect (OSTI)

Temperature dependent I-V characteristics of vacuum evaporated Al/(p)CdTe and Ni/(n)CdS Schottky junctions and their photovoltaic effects have been studied and compared. Different junction parameters such as ideality factors, barrier heights, Richardson's constant, short-circuit current density, fill factor, PV efficiency etc. were determined from their I-V characteristics. These parameters were found to change significantly on variation of temperature. The structures showed the change of PV effect. Efficiency found were 2.84% for Al/(p)CdTe and 4.44% for Ni hydro/(n)CdS. Polycrystalline nature, and continuous and ordered structure with bigger grain sizes of the CdS film shows more PV conversion efficiency in making Ni/(n)CdS junction as compare to Al/(p)CdTe junction. However these values were found to vary with doping concentration, and in hydrogen treated samples in both cases.

Wary, G. [Department of Physics, Cotton College, Guwahati-781001 (India); Kachari, T.; Rahman, A. [Department of Physics, Gauhati University, Guwahati-781014 (India)

2010-06-29T23:59:59.000Z

192

Microstructural characterisation of nanocomposite nc-MeC/a-C coatings on oxygen hardened Ti-6Al-4V alloy  

SciTech Connect (OSTI)

Nanocomposite coatings are novel, important systems composed of two or more nanocrystalline, or nanocrystalline and amorphous, phases. Such coatings offer a possibility of tailoring the coating microstructure and achieving new improved properties of coated materials. In this work a duplex surface treatment, consisting of an oxygen diffusion treatment and deposition of low friction nanocomposite nc-MeC/a-C (Me = transition metal, Ti, W or Cr) coatings, was applied for improvement of the Ti-6Al-4V alloy properties. The coatings composed of nanocrystallites of transition metal carbides (TiC or Cr{sub x}C{sub y} or WC) embedded in hydrogen-free amorphous carbon (a-C) matrix were deposited onto the surface of an oxygen hardened Ti-6Al-4 V alloy substrate by means of a simple DC magnetron sputtering. A nano/microstructure of the substrate material and coatings has been examined by scanning- and transmission electron microscopy complemented with the results of X-ray diffraction analyses. It was found that the nanocomposite coatings are composed of different carbide nanocrystals (with sizes of a few nanometres) embedded in an amorphous carbon matrix. The results of qualitative and quantitative analyses of the nanocrystalline phase in the coatings with use of high-resolution transmission electron microscopy combined with image analysis are given in the paper. An effect of the nano/microstructure parameters of the coated alloy onto its micro-mechanical (nanohardness and Young's modulus) and tribological properties (wear resistance and friction coefficient) is discussed in the paper.

Moskalewicz, T., E-mail: tmoskale@agh.edu.pl [AGH University of Science and Technology, Faculty of Metals Engineering and Industrial Computer Science, 30-059 Krakow, Al. Mickiewicza 30 (Poland); Wendler, B. [Technical University of Lodz, Institute of Materials Science and Engineering, PL-90 924 Lodz, ul. Stefanowskiego 1 (Poland); Czyrska-Filemonowicz, A. [AGH University of Science and Technology, Faculty of Metals Engineering and Industrial Computer Science, 30-059 Krakow, Al. Mickiewicza 30 (Poland)

2010-10-15T23:59:59.000Z

193

Conducting and insulating LaAlO{sub 3}/SrTiO{sub 3} interfaces: A comparative surface photovoltage investigation  

SciTech Connect (OSTI)

Surface photovoltage (SPV) spectroscopy, which is a versatile method to analyze the energetic distribution of electronic defect states at surfaces and interfaces of wide-bandgap semiconductor (hetero-)structures, is applied to comparatively investigate heterostructures made of 5-unit-cell-thick LaAlO{sub 3} films grown either on TiO{sub 2}- or on SrO-terminated SrTiO{sub 3}. As shown in a number of experimental and theoretical investigations in the past, these two interfaces exhibit dramatically different properties with the first being conducting and the second insulating. Our present SPV investigation reveals clearly distinguishable interface defect state distributions for both configurations when interpreted within the framework of a classical semiconductor band scheme. Furthermore, bare SrTiO{sub 3} crystals with TiO{sub 2} or mixed SrO/TiO{sub 2} terminations show similar SPV spectra and transients as do LaAlO{sub 3}-covered samples with the respective termination of the SrTiO{sub 3} substrate. This is in accordance with a number of recent works that stress the decisive role of SrTiO{sub 3} and the minor role of LaAlO{sub 3} with respect to the electronic interface properties.

Beyreuther, E., E-mail: elke.beyreuther@iapp.de; Thiessen, A.; Grafström, S.; Eng, L. M. [Institut für Angewandte Photophysik, Technische Universität Dresden, D-01062 Dresden (Germany); Paparo, D. [CNR-SPIN and Dipartimento di Fisica, Universitŕ di Napoli “Federico II,” Compl. Univ. di Monte S. Angelo, via Cintia, I-80126 Napoli (Italy)

2013-12-28T23:59:59.000Z

194

Dissimilar-alloy laser welding of titanium: Ti6Al-4V to Beta-C{trademark}  

SciTech Connect (OSTI)

Beta-C{sup TM} is a metastable-beta titanium alloy (nominal composition: Ti-3wt%Al-8wt%V-6wtTCr-4wt%Mo-4wt%Zr) which can be thermomechanically processed and heat treated to provide excellent combinations of strength, ductility, and fracture toughness. Recently, the increased application of metastable-beta titanium alloys in aerospace and commercial applications has resulted in the necessity to join these alloys to conventional alpha-beta titanium alloys. Based on this previous work, two approaches were considered for improving the ductility of dissimilar-alloy welds between Ti-6Al-4V and Beta-C{sup TM} in the present study: (1) application of a low heat input welding process to minimize the fusion zone and heat-affected zone (HAZ) beta grain size and (2) modification of the fusion zone chemical composition to allow greater microstructural optimization through postweld aging. CO{sub 2} laser welds were produced between Ti-6Al-4V and Beta-C{sup TM} sheet. Three different nominal fusion zone chemical compositions were obtained by varying the laser beam locations relative to the joint centerline and thereby melting different quantities of each base metal. For comparable postweld aging conditions, the laser welds exhibited ductilities superior to those of coarse-grained gas tungsten arc welds. Fracture analysis of the weld zone revealed a transition from a predominantly transgranular fracture in the low-temperature aged conditions to increasingly intergranular fracture following aging at higher temperature. This transition was promoted by an increase in the thickness and continuity of alpha phase at beta grain boundaries.

Liu, P.S.; Baeslack, W.A. III; Hurley, J.

1994-12-31T23:59:59.000Z

195

This journal is c The Royal Society of Chemistry 2010 Chem. Commun., 2010, 46, 73497351 7349 Self-assembled Ni/TiO2 nanocomposite anodes synthesized via electroless  

E-Print Network [OSTI]

-assembled Ni/TiO2 nanocomposite anodes synthesized via electroless plating and atomic layer deposition-binding affinity in electroless plating reactions. As a result, self-assembled metallic nanorods can be fabricated advantage of the proposed structure lies in the self-assembly of the viral materials. Nickel- coated TMV can

Larson-Prior, Linda

196

Growth of individual carbon nanotubes on an array of TiN/Ni nanodots patterned by e-beam lithography and defined by dry etching for field emission application.  

E-Print Network [OSTI]

: Individual vertically aligned carbon nanotubes, Electron-beam lithography, Dry etching, Field emission and uniform electronic emission, cathodes based on vertically aligned carbon nanotubes (VACNTs) are patternedGrowth of individual carbon nanotubes on an array of TiN/Ni nanodots patterned by e

Boyer, Edmond

197

Octahedral rotations in strained LaAlO{sub 3}/SrTiO{sub 3} (001) heterostructures  

SciTech Connect (OSTI)

Many complex oxides display an array of structural instabilities often tied to altered electronic behavior. For oxide heterostructures, several different interfacial effects can dramatically change the nature of these instabilities. Here, we investigate LaAlO{sub 3}/SrTiO{sub 3} (001) heterostructures using synchrotron x-ray scattering. We find that when cooling from high temperature, LaAlO{sub 3} transforms from the Pm3{sup Ż}m to the Imma phase due to strain. Furthermore, the first 4 unit cells of the film adjacent to the substrate exhibit a gradient in rotation angle that can couple with polar displacements in films thinner than that necessary for 2D electron gas formation.

Fister, T. T.; Hruszkewycz, S. O.; Proffit, D. L.; Eastman, J. A.; Fuoss, P. H.; Baldo, P. M.; Fong, D. D. [Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States); Zhou, H. [X-Ray Science Division, Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439 (United States); Luo, Z. [National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029 (China); Seo, S. S. A.; Lee, H. N. [Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)

2014-02-01T23:59:59.000Z

198

CO impurities effect on LaNi4.7Al0.3 hydrogen storage alloy hydrogenation/dehydrogenation properties  

E-Print Network [OSTI]

1 CO impurities effect on LaNi4.7Al0.3 hydrogen storage alloy hydrogenation thermal analyses (TG+DTA). The hydrogen storage properties were studied by the pressure in hydrogen containing 300 ppm CO at 30 ÂşC, but hydrogen storage capacity didn't degrade when tested at 80 Âş

Volinsky, Alex A.

199

Air stable Al2O3-coated Li2NiO2 cathode additive as a surplus current consumer in a Li-ion cell  

E-Print Network [OSTI]

cathode additive is prepared by coating with Al iso-propoxide on Li2NiO2, obtained from firing exothermic reaction with an electrolyte during the overcharging process, which may result in a short-circuiting of the cell.5­9 A combination of the temperature increase and the internal short circuit of the cell

Cho, Jaephil

200

Presence of a monoclinic (Pm) phase in the morphotropic phase boundary region of multiferroic (1???x)Bi(Ni{sub 1/2}Ti{sub 1/2})O{sub 3}-xPbTiO{sub 3} solid solution: A Rietveld study  

SciTech Connect (OSTI)

We present here the results of structural studies on multiferroic (1???x)Bi(Ni{sub 1/2}Ti{sub 1/2})O{sub 3}-xPbTiO{sub 3} solid solution using Rietveld analysis on powder x-ray diffraction data in the composition range 0.35???x???0.55. The stability region of various crystallographic phases at room temperature for (1???x)Bi(Ni{sub 1/2}Ti{sub 1/2})O{sub 3}-xPbTiO{sub 3} is determined precisely. Structural transformation from pseudo-cubic (x???0.40) to tetragonal (x???0.50) phase is observed via phase coexistence region demarcating the morphotropic phase boundary. The morphotropic phase boundary region consists of coexisting tetragonal and monoclinic structures with space group P4mm and Pm, respectively, stable in composition range 0.41???x???0.49 as confirmed by Rietveld analysis. The results of Rietveld analysis completely rule out the coexistence of rhombohedral and tetragonal phases in the morphotropic phase boundary region reported by earlier workers. A comparison between the bond lengths for “B-site cations-oxygen anions” obtained after Rietveld refinement, with the bond length calculated using Shannon-Prewitt ionic radii, reveals the ionic nature of B-O (Ni/Ti-O) bonds for the cubic phase and partial covalent character for the other crystallographic phases.

Pandey, Rishikesh, E-mail: akhilesh-bhu@yahoo.com, E-mail: aksingh.mst@itbhu.ac.in; Singh, Akhilesh Kumar, E-mail: akhilesh-bhu@yahoo.com, E-mail: aksingh.mst@itbhu.ac.in [School of Materials Science and Technology, Indian Institute of Technology (Banaras Hindu University), Varanasi 221005 (India)

2014-07-28T23:59:59.000Z

Note: This page contains sample records for the topic "ni ti al" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


201

Dielectric, ferromagnetic and maganetoelectric properties of BaTiO{sub 3}–Ni{sub 0.7}Zn{sub 0.3}Fe{sub 2}O{sub 4} composite ceramics  

SciTech Connect (OSTI)

Graphical abstract: - Highlights: • The lead-free ME ceramic composites BaTiO{sub 3}–Ni{sub 0.7}Zn{sub 0.3}Fe{sub 2}O{sub 4} were successfully synthesized. • The composites showed high dielectric constant and low dielectric loss. • The composite with 30% NiZn ferrite presented good soft magnetic properties and ME performance. - Abstract: Lead-free magnetoelectric composite ceramics (1 ? x)BaTiO{sub 3}–xNi{sub 0.7}Zn{sub 0.3}Fe{sub 2}O{sub 4} (x = 0.15, 0.3, 0.45) were successfully prepared by conventional oxide ceramic process. The tetragonal perovskite BaTiO{sub 3} and cubic spinel Ni{sub 0.7}Zn{sub 0.3}Fe{sub 2}O{sub 4} were confirmed by X-ray diffraction. The dielectric behaviors of all composite samples show a normal response to the increasing measurement frequency and Ni{sub 0.7}Zn{sub 0.3}Fe{sub 2}O{sub 4} ferrite content. Well defined ferromagnetic hysteresis loops and obvious magnetoelectric coupling effect are observed in the composite ceramics. The influence of applied dc bias magnetic field and Ni{sub 0.7}Zn{sub 0.3}Fe{sub 2}O{sub 4} ferrite content on the magnetoelectric coupling responding voltage is investigated. The strongest peak magnetoelectric coupling voltage coefficient is 124 ?V/cm Oe when x = 0.3, which corresponds to the maximum magnetoelectric coupling responding voltage of 200 ?V.

Zhang, Rong-Fen [Department of Electronic Science, College of Science, Key Laboratory of Functional Composite Materials of Guizhou Province, Guizhou University, Guiyang, Guizhou 550025 (China); Deng, Chao-Yong, E-mail: cydeng@gzu.edu.cn [Department of Electronic Science, College of Science, Key Laboratory of Functional Composite Materials of Guizhou Province, Guizhou University, Guiyang, Guizhou 550025 (China); Ren, Li [Department of Electronic Science, College of Science, Key Laboratory of Functional Composite Materials of Guizhou Province, Guizhou University, Guiyang, Guizhou 550025 (China); Li, Zheng [Department of Materials Science and Engineering, State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University, Beijing 100084 (China); Zhou, Jian-Ping [College of Physics and Information Technology, Shaanxi Normal University, Xi’an 710062 (China)

2013-10-15T23:59:59.000Z

202

Thermal stability and oxidation resistance of TiCrAlYO coatings on SS430  

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203

Precipitation behavior of Ni-Cr-22 Fe-18 Mo (Hastelloy-X) and Ni-Cr-22 Co-12 Mo (Inconel-617) after isothermal aging  

SciTech Connect (OSTI)

The precipitation behavior of the nickel-base alloys Ni-Cr-22Fe-18Mo (Hastelloy-X) and Ni-Cr-22Co12Mo (Inconel-617) has been investigated as a function of aging temperature. Hastelloy-X shows that M/sub 6/C and TiN are primary precipitates and M/sub 12/C, A/sub 3/B/sub 2/ (approx. = Fe/sub 3/Mo/sub 2/), and M/sub 23/C/sub 6/ are secondary precipitates, while Inconel-617 also has M/sub 6/C and TiN as primary precipitates and M/sub 23/C/sub 6/, M/sub 12/C, and Ni/sub 3/AlTi as secondary precipitates. The characterization has been carried out by metallographic and transmission electron microscopy investigations and by x-ray examinations of electrochemical isolated precipitates.

Kirchhofer, H.; Nickel, H.; Schubert, F.

1984-07-01T23:59:59.000Z

204

A Successful Synthesis of the CoCrFeNiAl{sub 0.3} Single-Crystal, High-Entropy Alloy by Bridgman Solidification  

SciTech Connect (OSTI)

For the first time, a face-centered-cubic, single-crystal CoCrFeNiAl{sub 0.3} (designated as Al0.3), high-entropy alloy (HEA) was successfully synthesized by the Bridgman solidification (BS) method, at an extremely low withdrawal velocity through a constant temperature gradient, for which it underwent two BS steps. Specially, at the first BS step, the alloy sample underwent several morphological transitions accompanying the crystal growth from the melt. This microstructure evolves from as-cast dendrites, to equiaxed grains, and then to columnar crystals, and last to the single crystal. In particular, at the equiaxed-grain region, some visible annealing twins were observed, which indicates a low stacking fault energy of the Al0.3 alloy. Although a body-centered- cubic CoCrFeNiAl (Al1) HEA was also prepared under the same conditions, only a single columnar-crystal structure with instinctively preferential crystallographic orientations was obtained by the same procedure. A similar morphological transition from dendrites to equiaxed grains occurred at the equiaxed-grain region in Al1 alloy, but the annealing twins were not observed probably because a higher Al addition leads to a higher stacking fault energy for this alloy.

Ma, S. G.; Zhang, S. F.; Gao, M. C.; Liaw, P. K.; Zhang, Y.

2013-12-01T23:59:59.000Z

205

Formation mechanism of linear friction welded Ti-6Al-4V alloy joint based on microstructure observation  

SciTech Connect (OSTI)

The microstructure of the linear friction welded Ti-6Al-4V titanium alloy joint was investigated by optical microscope, scanning electronic microscope and transmission electron microscope. Results show that the dynamic recovery and recrystallization resulting from the intensive plastic deformation and fast heating and cooling processes during linear friction welding account for the superfine {alpha} + {beta} grains in the weld center. Fine {alpha} grains distribute in the {beta} matrix or at the boundaries of {beta} grains. A mass of dislocations networks and metastructures present within the {alpha} and {beta} grains. - Research Highlights: {yields} TEM is employed in the analysis. {yields} The dynamic recovery is the main mechanism in thermal deformation of TC4. {yields} Superfine grains in the weld result from dynamic recovery and dynamic recrystallizaion, but the recrystallization is inadequate.

Ma Tiejun; Chen Tao, E-mail: ctwc-13@163.com; Li Wenya; Wang Shiwei; Yang Siqian

2011-01-15T23:59:59.000Z

206

Initial coke deposition on a NiMo/{gamma}-Al{sub 2}O{sub 3} bitumen hydroprocessing catalyst  

SciTech Connect (OSTI)

Athabasca bitumen was hydrocracked over a commercial NiMo/{gamma}-Al{sub 2}O{sub 3} catalyst in two reactors, a microbatch reactor and a 1-L continuous stirred tank reactor (CSTR). Coke deposition on catalyst was measured as a function of hydrogen pressure, time on stream, and liquid composition by measuring the carbon content of the cleaned spent catalyst. The carbon content ranged from 11.3% to 17.6% over the pressure range 6.9--15.2 MPa in CSTR experiments. Batch and CSTR experiments showed a rapid approach to a constant coke content with increasing oil/catalyst ratio. Coke deposition was independent of product composition for residue concentrations ranging from 8% to 32% by weight. Removal of the coke by tetralin at reaction conditions suggested reversible adsorption of residue components on the catalyst surface. A physical model based on clearance of coke by hydrogen in the vicinity of metal crystallites is presented for the coke deposition behavior during the first several hours of hydrocracking use. This model gives good agreement with experimental data, including the effect of reaction time, the ratio of total feed weight to catalyst weight, hydrogen pressure, and feed composition, and it agrees with general observations from industrial usage. The model implies that except at the highest coke levels, the active surfaces of the metal crystallites remain exposed. Severe mass-transfer limitations are caused by the overall narrowing of the pore structure, which in {gamma}-Al{sub 2}O{sub 3} would give very low effective diffusivity for residuum molecules in micropores.

Richardson, S.M.; Nagaishi, Hiroshi; Gray, M.R. [Univ. of Alberta, Edmonton (Canada). Dept. of Chemical Engineering] [Univ. of Alberta, Edmonton (Canada). Dept. of Chemical Engineering

1996-11-01T23:59:59.000Z

207

Microstructures and mechanical properties of Ti-6Al-4V welds with filler additions of tantalum and FS85  

SciTech Connect (OSTI)

Many applications in the nuclear industry require that titanium alloys be welded to refractory metal alloys. Because of the widely dissimilar properties of these materials, the homogeneity of the fusion zone os of particular concern. To address this issue, a study was conducted to characterize the fusion zones of Ti-6Al-4V welds made with filler additions of tantalum and FS85 (Nb-28Wt%Ta-10wt%W-1wt%Zr). A goal of this study was to evaluate the feasibility of making microstructural predictions based on calculated fusion zone electron/atom (e/a) ratios. The welds were made by placing tantalum or FS85 shims between two pieces of 2.5 mm (0.1 in.) thick Ti-6Al-4V and making an electron beam weld along the length of the shim. With complete mixing, these shims were expected to produce fusion zone e/a ratios of 3.63{emdash}4.14 for the Ta series and 3.63{emdash}4.06 for the FS85 series, and microstructures consisting of {alpha}`, {alpha}`, and perhaps {omega}. The weld macro- and microstructures were characterized using optical and electron microscopy, energy-dispersive spectroscopy, and x-ray diffraction. The mechanical properties of the welds were assessed using transverse and all-weld-metal tensile tests. The results showed a general increase in strength and decrease in ductility with increasing {beta} stabilizer level. As a result of this study, parameters were developed to increase the fusion zone size and increase mixing of the components. This work was performed at Sandia National Laboratories, supported by the U.S. Department of Energy under contract number DE-AC04-76DR00789, and at Los Alamos National Laboratory under contract number W-7405-ENG-36.

Damkroger, B.K.; Dixon, R.D.; Cotton, J.D.

1994-12-31T23:59:59.000Z

208

Perpendicular local magnetization under voltage control in Ni films on ferroelectric BaTiO3 substrates  

E-Print Network [OSTI]

of Parma viale G. P. Usberti 7/A , Parma 43124 , Italy Dr. F. Maccherozzi, Prof. S. S. Dhesi Diamond Light Source Chilton, Didcot , Oxfordshire OX11 0DE , UK Dr. N.-J. Steinke, Dr. R. Mansell, Prof. C. H. W. Barnes Cavendish Laboratory... , minimizing stray-fi eld energy. The IP component of magnetization lies perpendicular to this IP direction, along the same direction in adjacent stripes. In polycrystalline fi lms of negative-magnetostriction Ni, which show stripe domains above a critical...

Ghidini, Massimo; Maccherozzi, Francesco; Moya, Xavier; Phillips, Lee C.; Yan, Wenjing; Soussi, Jordane; Métallier, Nicolas; Vickers, Mary E.; Steinke, Nina -J.; Mansell, Rhodri; Barnes, Crispin H. W.; Dhesi, Sarnjeet S.; Mathur, Neil D.

2015-01-12T23:59:59.000Z

209

Anti-site disorder and improved functionality of Mn{sub 2}NiX (X = Al, Ga, In, Sn) inverse Heusler alloys  

SciTech Connect (OSTI)

Recent first-principles calculations have predicted Mn{sub 2}NiX (X?=?Al, Ga, In, Sn) alloys to be magnetic shape memory alloys. Moreover, experiments on Mn{sub 2}NiGa and Mn{sub 2}NiSn suggest that the alloys deviate from the perfect inverse Heusler arrangement and that there is chemical disorder at the sublattices with tetrahedral symmetry. In this work, we investigate the effects of such chemical disorder on phase stabilities and magnetic properties using first-principles electronic structure methods. We find that except Mn{sub 2}NiAl, all other alloys show signatures of martensitic transformations in presence of anti-site disorder at the sublattices with tetrahedral symmetry. This improves the possibilities of realizing martensitic transformations at relatively low fields and the possibilities of obtaining significantly large inverse magneto-caloric effects, in comparison to perfect inverse Heusler arrangement of atoms. We analyze the origin of such improvements in functional properties by investigating electronic structures and magnetic exchange interactions.

Paul, Souvik; Kundu, Ashis; Ghosh, Subhradip, E-mail: subhra@iitg.ernet.in [Department of Physics, Indian Institute of Technology Guwahati, Guwahati, Assam 781039 (India); Sanyal, Biplab [Department of Physics and Astronomy, Uppsala University, Box 516, 75120 Uppsala (Sweden)

2014-10-07T23:59:59.000Z

210

Characterization of solid-phase welds between Ti-6Al-2Sn-4Zr-2Mo-0. 01Si and Ti-13. 5A1-21. 5Nb titanium aluminide  

SciTech Connect (OSTI)

Dissimilar-alloy welds have been produced between Ti-6Al-2Sn-4Zr-2Mo-0.1Si (wt.%) and Ti-13.5Al-21.5Nb (wt.%) titanium aluminide using three different solid-phase welding processes that create significantly different thermo-mechanical conditions at the weld interface. Exposure to supertransus temperatures, appreciable deformation and rapid cooling of the weld interface region during linear-friction welding promote dynamic recrystallization of beta grains and beta decomposition to fine martensitic products. In contrast, diffusion welding at temperatures below the base metal beta transus temperatures and at relatively low pressures minimizes deformation and microstructural variations in the weld interface region relative to the unaffected base metal. During capacitor-discharge resistance spot welding, extremely rapid heating of the weld interface region to near-solidus temperatures, and subsequent rapid cooling, result in the formation of a metastable, ordered-beta microstructure in the Ti-13.5ASl-21.5Nb and fine alpha-prime martensite in the Ti-6Al-2Sn-4Zr-2Mo-0.1Si.

Baeslack, W.A. III; Juhas, M.; Fraser, H.L. (Ohio State Univ., Columbus, OH (United States)); Broderick, T.F. (Wright Labs., Wright Patterson AFB, OH (United States). Materials Directorate)

1994-12-01T23:59:59.000Z

211

Influence of Microstructure on Residual Thermal Stresses in TiCxN1-x and -Al2O3 Coatings on WC-Co Tool Inserts  

E-Print Network [OSTI]

Influence of Microstructure on Residual Thermal Stresses in TiCxN1-x and -Al2O3 Coatings on WC deposited coatings on four tool inserts have been comprehensively characterized using electron backscatter the residual thermal strains in the coatings. The results indicate that the thermal strains and stored elastic

Rohrer, Gregory S.

212

Effect of oxygen incorporation on the structure and elasticity of Ti-Al-O-N coatings synthesized by cathodic arc and high power pulsed magnetron sputtering  

SciTech Connect (OSTI)

Ti-Al-O-N coatings were synthesized by cathodic arc and high power pulsed magnetron sputtering. The chemical composition of the coatings was determined by means of elastic recoil detection analysis and energy dispersive X-ray spectroscopy. The effect of oxygen incorporation on the stress-free lattice parameters and Young's moduli of Ti-Al-O-N coatings was investigated by X-ray diffraction and nanoindentation, respectively. As nitrogen is substituted by oxygen, implications for the charge balance may be expected. A reduction in equilibrium volume with increasing O concentration is identified by X-ray diffraction and density functional theory calculations of Ti-Al-O-N supercells reveal the concomitant formation of metal vacancies. Hence, the oxygen incorporation-induced formation of metal vacancies enables charge balancing. Furthermore, nanoindentation experiments reveal a decrease in elastic modulus with increasing O concentration. Based on ab initio data, two causes can be identified for this: First, the metal vacancy-induced reduction in elasticity; and second, the formation of, compared to the corresponding metal nitride bonds, relatively weak Ti-O and Al-O bonds.

Hans, M., E-mail: hans@mch.rwth-aachen.de; Baben, M. to; Music, D.; Ebenhöch, J.; Schneider, J. M. [Materials Chemistry, RWTH Aachen University, Kopernikusstr. 10, D-52074 Aachen (Germany); Primetzhofer, D. [Department of Physics and Astronomy, Uppsala University, Lägerhyddsvägen 1, S-75120 Uppsala (Sweden); Kurapov, D.; Arndt, M.; Rudigier, H. [Oerlikon Balzers Coating AG, Iramali 18, LI-9496 Balzers, Principality of Liechtenstein (Liechtenstein)

2014-09-07T23:59:59.000Z

213

Inuence of foreign-object damage on crack initiation and early crack growth during high-cycle fatigue of Ti6Al4V  

E-Print Network [OSTI]

incidence of late of HCF- related engine failures, particularly involving titanium alloy fan and compressor.g., stones, primarily on the fan blades, can cause (de- pending on the impact severity) immediate blade of small surface fatigue cracks in a Ti±6Al±4V alloy, processed for typical turbine blade applications

Ritchie, Robert

214

Helium effects on the reweldability and low cycle fatigue properties of welded joints for type Cr16Ni11Mo3Ti and 316L(N) stainless steels  

SciTech Connect (OSTI)

The feasibility of welding neutron irradiated modules and tubes for repair or replacement purposes is one of the key problems in life time estimates for austenitic steel, intended for use as structural material in the first wall , blanket and vacuum vessel of the International Thermonuclear Experimental Reactor (ITER). Here, the reweldability of austenitic alloys has been studied for flat specimens of Cr16Ni11Mo3Ti (Russian) and 316L(N)-SPH (European Union) which have been implanted with helium using cyclotron facilities. Specimens with typical thicknesses of 1 mm have been implanted up the helium concentrations of 50, 100, 300 and 860 appm on both sides. Electron beam welding of Cr16Ni11Mo3Ti resulted in weld cracking for specimens with the highest helium concentration of 860 appm, unlike the 316L-SPH material in similar conditions. A reduction in fatigue life in low cycle fatigue was found to be more significant for welded joints of Cr16Ni11Mo3Ti material.

Fabritsiev, S.A. [D.V. Efremov Inst. of Electrophysical Apparatus, St. Petersburg (Russian Federation); Laan, J.G. van der [Netherlands Energy Research Foundation, Petten (Netherlands)

1996-12-31T23:59:59.000Z

215

First-principles insights on the magnetism of cubic SrTi1-xCoxO3-J. M. Florez, S. P. Ong, M. C. Onbali, G. F. Dionne, P. Vargas et al.  

E-Print Network [OSTI]

First-principles insights on the magnetism of cubic SrTi1-xCoxO3- J. M. Florez, S. P. Ong, M. C/APPLAB/v100/i25 Published by the American Institute of Physics. Related Articles Magnetic properties and magnetic properties of BaTi1-xMnxO3 multiferroics J. Appl. Phys. 111, 113913 (2012) Preparation of Fe2Ni2N

Ceder, Gerbrand

216

Premartensitic microstructures as seen in the high-resolution electron microscope: A study of a Ni-Al alloy  

SciTech Connect (OSTI)

The present study indicates that the B2 ..beta..-phase in quenched Ni/sub 62.5/Al/sub 37.5/ is distorted by displacement waves involving a planar shufflin of atoms resembling the final 7R martensite structure and with wavelenghts of the order of 1.3 nm. The appearance of a <110><110> type modulation with the indicated periodicity corresponds well with recent inelastic neutron scattering results which reveal nonlinear behavior in the TA<110> phonon dispersion curve around the same wavelengths indicating a partial lattice softening for such waves. In bulk material all six equivalent wave-vectors are equally present. These distortional modulations are configured in some form of three-dimensional assembly. Following the interpretation given above, it can be concluded that a one-dimensional domain structure along one of six <110> directions may exist. However, the beating of six displacement waves with apparently uncorrelated phase and wavelengths rules out the existence of a ''conventional'' three-dimensional domain structure. For this reason it is uncertain whether much more information can be gained from such image simulations. There are now numerous indications that the underlying structure to the tweed contrast in this alloy is a precursor effect of the martensitic transformation. However, a detailed description of the effective correlation between the distorted parent phase and the martensitic product phase has yet to be developed. Recent HREM results reveal the existence of a sequence of different structures in the transition region between the modulated ..beta..-phase and the martensitic phase, depending on parameters such as the local composition and stress. Such transition structures include modulated k..beta..-phase in which only one (110) modulation is preferred or in which the periodicity differs from the above described 1.3 nm and the FCT L1/sub o/ martensite with single shear defects. 1 fig., 26 refs.

Schryvers, D.; Tanner, L.; Van Tendeloo, G.

1988-02-12T23:59:59.000Z

217

Influence of oxygen pressure and aging on LaAlO{sub 3} films grown by pulsed laser deposition on SrTiO{sub 3} substrates  

SciTech Connect (OSTI)

The crystal structures of LaAlO{sub 3} films grown by pulsed laser deposition on SrTiO{sub 3} substrates at oxygen pressure of 10{sup ?3} millibars or 10{sup ?5} millibars, where kinetics of ablated species hardly depend on oxygen background pressure, are compared. Our results show that the interface between LaAlO{sub 3} and SrTiO{sub 3} is sharper when the oxygen pressure is lower. Over time, the formation of various crystalline phases is observed while the crystalline thickness of the LaAlO{sub 3} layer remains unchanged. X-ray scattering as well as atomic force microscopy measurements indicate three-dimensional growth of such phases, which appear to be fed from an amorphous capping layer present in as-grown samples.

Park, Jihwey; Aeppli, Gabriel [London Centre for Nanotechnology, University College London, London WC1H 0AH (United Kingdom); Soh, Yeong-Ah, E-mail: yeongahsoh@gmail.com [London Centre for Nanotechnology, University College London, London WC1H 0AH (United Kingdom); Department of Materials, Imperial College London, London SW7 2AZ (United Kingdom); David, Adrian; Lin, Weinan [Division of Physics and Applied Physics, Nanyang Technological University, Singapore 637371 (Singapore); Wu, Tom [Physical Sciences and Engineering Division, King Abdullah University of Science and Technology, Thuwal 23955-6900 (Saudi Arabia)

2014-02-24T23:59:59.000Z

218

Epitaxial growth of metastable multiferroic AlFeO{sub 3} film on SrTiO{sub 3} (111) substrate  

SciTech Connect (OSTI)

GaFeO{sub 3}-type AlFeO{sub 3} is consisted of oxygen octahedra and tetrahedra containing Al and Fe ions and is known to have a non-centrosymmetric polar structure with space group Pna2{sub 1}. We tried to grow epitaxial GaFeO{sub 3}-type AlFeO{sub 3} films on SrTiO{sub 3} (111) substrates by pulsed laser deposition technique. Both the atomic arrangement of close-packed and the atomic distance of the substrate surface played important roles in stabilizing GaFeO{sub 3}-type AlFeO{sub 3} on the substrate. Piezoresponse force microscopy measurements clearly showed that GaFeO{sub 3}-type AlFeO{sub 3} films have ferroelectricity at room temperature. In addition, AlFeO{sub 3} film also showed pinched-like hysteresis loop with T{sub N}???317?K.

Hamasaki, Yosuke; Shimizu, Takao; Taniguchi, Hiroki; Taniyama, Tomoyasu; Yasui, Shintaro; Itoh, Mitsuru, E-mail: itoh.m.aa@m.titech.ac.jp [Materials and Structures Laboratory, Tokyo Institute of Technology, 4259-J2-19 Nagatsuta-cho, Midori-ku, Yokohama 226-8503 (Japan)

2014-02-24T23:59:59.000Z

219

al70ni10ti10zr5ta5 amorphous alloy: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Summary: alloy of composition correspond- ing to the metallic components of the superconduct- ing oxides respectivement. Abstract. - Previous quenching experiments on 2212...

220

Analysis of Wear Mechanisms in Low Friction, Nanocomposite AlMgB14-TiB2 Coatings  

SciTech Connect (OSTI)

Recent developments in coating science and technology offer new opportunities to enhance the energy-efficiency and performance of industrial machinery such as hydraulic fluid pumps and motors. The lubricated friction and wear characteristics of two wear-resistant coatings, diamond-like carbon and a nanocomposite material based on AlMgB{sub 14}-50 vol.% TiB{sub 2}, were compared in pin-on-disk tribotests using Mobil DTE-24{trademark} oil as the lubricant. In each case, the pins were fixed 9.53 mm diameter spheres of AISI 52100 steel, the load was 10 N, and the speed 0.5 m/s in all tests. Average steady-state friction coefficient values of 0.10 and 0.08 were measured for the DLC and nanocomposite, respectively. The coatings and their 52100 steel counterfaces were analyzed after the tests by X-ray photoelectron and Auger spectroscopy for evidence of material transfer or tribo-chemical reactions. The low-friction behavior of the boride nanocomposite coating is due to the formation of lubricative boric acid, B(OH){sub 3}. In contrast, the low-friction behavior of the DLC coating is related to the relatively low dielectric constant of the oil-based lubricant, leading to desorption of surface hydrogen from the coating.

Cook, Bruce A [Ames Laboratory; Harringa, J [Ames Laboratory; Anderegg, A [Ames Laboratory; Russell, A M [Iowa State University; Qu, Jun [ORNL; Blau, Peter Julian [ORNL; Higdon, Clifton [Eaton Corporation; Elmoursi, Alaa A [Eaton Corporation

2010-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "ni ti al" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


221

The Effect of Oxygen Contamination on the Amorphous Structure of Thermally Sprayed Coatings of Cu47Ti33Zr11Ni8Si1  

SciTech Connect (OSTI)

this research has shown that it is possible to deposit coatings of gas atomized Cu{sub 47}Ti{sub 33}Zr{sub 11}Ni{sub 8}Si{sub 1} powders containing various levels of oxygen contamination using plasma arc spray methods. The structure of the coating was found to depend primarily on the spray environment, with an argon atmosphere producing the most amorphous samples for a given starting powder. The oxygen content of the coatings reflected the relative levels of the oxygen contamination in the starting powders. The analysis of the starting powders displayed oxygen contents ranging from 0.125-0.79 wt.%. It was shown that higher oxygen levels lead to more crystalline structure in the starting powders as determined by X-ray diffraction (XRD) and differential scanning calorimetry (DSC). This trend was found to be true for both the starting powders and for the plasma sprayed coatings. Chemical composition for all starting powders was very close to the nominal alloy composition. Chemical changes in the coatings involved the loss of Cu in coatings where high levels of oxidation were found. Cavitation erosion testing of selected coatings showed a weak trend that coatings prepared by vacuum plasma spray (VPS) had lower damage rates, but there was no clear data to indicate which coating parameters were superior. The range of data produced from testing duplicate coating was too wide to provide a good statistical measure of cavitation erosion resistance. of interest was the fact that when coatings began to show damage from cracking, all samples of a group showed similar damage and usually the damage pattern was somewhat unique to that group of samples. Failure of the coatings was due to features inherent to plasma arc spray (PAS) coating (i.e., pores, splat boundaries, oxide inclusions) rather than the mechanical characteristics of the amorphous alloy.

Matthew Frank Besser

2002-05-27T23:59:59.000Z

222

Effect of Mo Dispersion Size and Water Vapor on Oxidation of Two-Phase Directionally Solidified NiAl-9Mo In-Situ Composites  

SciTech Connect (OSTI)

Oxidation of two-phase NiAl-9Mo eutectics with 3 different growth rates/2nd phase Mo dispersion sizes were investigated at 900 C in air and air with 10% water vapor. Good oxidation resistance via alumina formation was observed in dry air, with Mo volatilization loss minimized by fine submicron Mo dispersions. However, extensive Mo volatilization and in-place internal oxidation of prior Mo phase regions was observed in wet air oxidation. Ramifications of this phenomenon for the development of multi-phase high-temperature alloys are discussed

Brady, Michael P [ORNL] [ORNL; Bei, Hongbin [ORNL] [ORNL; Meisner, Roberta Ann [ORNL] [ORNL; Lance, Michael J [ORNL] [ORNL; Tortorelli, Peter F [ORNL] [ORNL

2014-01-01T23:59:59.000Z

223

Effects of Al-5Ti-1B master alloy on the microstructural evaluation of a highly alloyed aluminum alloy produced by SIMA process  

SciTech Connect (OSTI)

This study was undertaken to investigate the influence of Al-5Ti-1B master alloy on the structural characteristics of Al-12Zn-3 Mg-2.5Cu aluminum alloy. The optimum amount of Ti containing master alloy for proper grain refining was selected as 6 wt.%. A modified strain-induced, melt-activated (SIMA) process for semi-solid processing of alloys was proposed. In order to examine the effectiveness of the modified SIMA process, the recrystallized microstructures of the Al alloy (Al-12Zn-3 Mg-2.5Cu) prepared by the modified SIMA processes were macroscopically. The modified SIMA process employed casting, warm multi-forging, recrystallization and partial melting instead of the conventional process. Reheating condition to obtain a fine globular microstructure was optimized. The microstructure evolution of reheated Al-12Zn-3 Mg-2.5Cu aluminum alloy was characterized by SEM (Scanning electron microscopy) and optical microscopy. In this study the relation between the induced strain with size and shape of grain size has been studied. Results indicated that with the increase of strain sphericity of particles, their size decreases and sphericity takes place in less reahiting time.

Alipour, M.; Emamy, M.; Azarbarmas, M.; Karamouz, M. [Center of Excellence for High Performance Materials, School of Metallurgy and Materials, University of Tehran, Tehran (Iran, Islamic Republic of)

2010-06-15T23:59:59.000Z

224

On the effect of deep-rolling and laser-peening on the stress-controlled low- and high-cycle fatigue behavior of Ti-6Al-4V at elevated temperatures up to 550?C  

E-Print Network [OSTI]

and near-?-titanium alloys, especially for fan bladebehavior of a titanium Ti-6Al-4V turbine fan blade alloy isfan blades and disks in aircraft jet propulsion engines are commonly made from titanium

Ritchie, IAltenberger, RKNalla, YSano LWagner, RO

2013-01-01T23:59:59.000Z

225

Observation of strontium segregation in LaAlO{sub 3}/SrTiO{sub 3} and NdGaO{sub 3}/SrTiO{sub 3} oxide heterostructures by X-ray photoemission spectroscopy  

SciTech Connect (OSTI)

LaAlO{sub 3} and NdGaO{sub 3} thin films of different thicknesses have been grown by pulsed laser deposition on TiO{sub 2}-terminated SrTiO{sub 3} single crystals and investigated by soft X-ray photoemission spectroscopy. The surface sensitivity of the measurements has been tuned by varying photon energy h? and emission angle ?. In contrast to the core levels of the other elements, the Sr 3d line shows an unexpected splitting for higher surface sensitivity, signaling the presence of a second strontium component. From our quantitative analysis we conclude that during the growth process Sr atoms diffuse away from the substrate and segregate at the surface of the heterostructure, possibly forming strontium oxide.

Treske, Uwe; Heming, Nadine; Knupfer, Martin; Büchner, Bernd; Koitzsch, Andreas, E-mail: a.koitzsch@ifw-dresden.de [Institute for Solid State Research, IFW-Dresden, P.O. Box 270116, DE-01171 Dresden (Germany); Di Gennaro, Emiliano; Scotti di Uccio, Umberto; Miletto Granozio, Fabio [CNR-SPIN and Dipartimento di Fisica, Complesso Universitario di Monte S. Angelo, Via Cintia, 80126 Naples (Italy); Krause, Stefan [Helmholtz-Zentrum Berlin, BESSY, Albert-Einstein-Str. 15, 12489 Berlin (Germany)

2014-01-01T23:59:59.000Z

226

AL  

E-Print Network [OSTI]

AL. EMERGENCY PREPAREDNESS SYLLABUS ATTACHMENT. EMERGENCY NOTIFICATION PROCEDURES are based on a simple concept - if you hear a.

227

Solvothermal synthesis of NiAl double hydroxide microspheres on a nickel foam-graphene as an electrode material for pseudo-capacitors  

SciTech Connect (OSTI)

In this paper, we demonstrate excellent pseudo-capacitance behavior of nickel-aluminum double hydroxide microspheres (NiAl DHM) synthesized by a facile solvothermal technique using tertbutanol as a structure-directing agent on nickel foam-graphene (NF-G) current collector as compared to use of nickel foam current collector alone. The structure and surface morphology were studied by X-ray diffraction analysis, Raman spectroscopy and scanning and transmission electron microscopies respectively. NF-G current collector was fabricated by chemical vapor deposition followed by an ex situ coating method of NiAl DHM active material which forms a composite electrode. The pseudocapacitive performance of the composite electrode was investigated by cyclic voltammetry, constant charge–discharge and electrochemical impedance spectroscopy measurements. The composite electrode with the NF-G current collector exhibits an enhanced electrochemical performance due to the presence of the conductive graphene layer on the nickel foam and gives a specific capacitance of 1252 F g{sup ?1} at a current density of 1 A g{sup ?1} and a capacitive retention of about 97% after 1000 charge–discharge cycles. This shows that these composites are promising electrode materials for energy storage devices.

Momodu, Damilola; Bello, Abdulhakeem; Dangbegnon, Julien; Barzeger, Farshad; Taghizadeh, Fatimeh; Fabiane, Mopeli; Manyala, Ncholu, E-mail: ncholu.manyala@up.ac.za [Department of Physics, Institute of Applied Materials, SARChI Chair in Carbon Technology and Materials, University of Pretoria, Pretoria 0028, South Africa. (South Africa); Johnson, A. T. Charlie [Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, Pennsylvania 19104 (United States)

2014-09-15T23:59:59.000Z

228

Precipitation in 9Ni-12Cr-2Cu maraging steels  

SciTech Connect (OSTI)

Two maraging steels with the compositions 9Ni-12Cr-2Cu-4Mo (wt%) and 9Ni-12Cr-2Cu and with small additions of Al and Ti were investigated using atom probe field ion microscopy. Tomographic atom probe investigations were performed to clarify the spatial distribution of elements in and close to the precipitates. Materials heat treated at 475 C for 5, 25 min, 1, 2, 4 and 400 h were analyzed. Precipitates in the Mo-rich material were observed already after 5 min of aging, while in the material without MO, precipitation started later. In both materials precipitation begins with the formation of Cu-rich particles which work as nucleation sites for a Ni-rich phase of type Ni{sub 3}(Ti,Al). A Mo-rich phase was detected in the Mo-rich steel after 2 h of aging. The distribution of alloying elements in the precipitates, their role in the precipitation process, and the mechanism of hardening in the two materials are discussed.

Stiller, K.; Haettestrand, M. [Chalmers Univ. of Technology, Goeteborg (Sweden). Dept. of Physics] [Chalmers Univ. of Technology, Goeteborg (Sweden). Dept. of Physics; Danoix, F. [Univ. de Rouen, Mont Saint Aignan (France). Lab. de Microscopie Ionique] [Univ. de Rouen, Mont Saint Aignan (France). Lab. de Microscopie Ionique

1998-11-02T23:59:59.000Z

229

Structural investigation in the TiB{sub 2}-(Na{sub 2}O.B{sub 2}O{sub 3}.Al{sub 2}O{sub 3}) system  

SciTech Connect (OSTI)

Composites in the TiB{sub 2}-Na{sub 2}O.B{sub 2}O{sub 3}.Al{sub 2}O{sub 3} systems, TiB{sub 2}-MBA (MB stands for sodium metaborate and A is Al{sub 2}O{sub 3}), were prepared by self-propagating high-temperature synthesis (SHS), in simultaneous mode. Selection of these compositions was ruled by the interesting properties of both TiB{sub 2} and double borates of alkali metal and aluminum. The structure of the obtained materials was evaluated by micro-Raman spectroscopy, from room temperature up to 600 {sup o}C, and X-ray photoelectron spectroscopy (XPS). Formation of the TiB{sub 2} and TiO{sub 2-x}B{sub x} phases along with TiO{sub 2} as rutile were identified as titanium speciation in the grain phase embedded in a sodium aluminum borate matrix. Integration of the Raman spectra of the grain phases revealed a TiB{sub 2} content of 16.99% and 23.32% for the two composite investigated 2TiB{sub 2}.2MBA and 3TiB{sub 2}.5MBA. A constrained-width model for the spectral deconvolution of the high-frequency Raman band was forwarded to calculate the proportion of tetrahedral boron atoms (7.424%) in the blank borate matrix Na{sub 2}B{sub 2}O{sub 4}.Al{sub 2}O{sub 3} in solid phase. - Graphical abstract: Deconvolution of the reduced Raman spectrum of the grain phase in TiB{sub 2}-(Na{sub 2}O.B{sub 2}O{sub 3}.Al{sub 2}O{sub 3}) composite along with its Raman micrographs collected at room temperature.

Buixaderas, Elena, E-mail: buixader@fzu.c [Institute of Physics, Academy of Science of the Czech Republic, Dielectrics Department, Na Slovance 2, 18221 Prague 8 (Czech Republic); Maria Anghel, Elena, E-mail: manghel@icf.r [Institute of Physical Chemistry 'Ilie Murgulescu'of Romanian Academy, Molten Salts Department, Spl. Independentei 202, 060021 Bucharest (Romania); Petrescu, Simona [Institute of Physical Chemistry 'Ilie Murgulescu'of Romanian Academy, Molten Salts Department, Spl. Independentei 202, 060021 Bucharest (Romania); Osiceanu, Petre, E-mail: posic@icf.r [Institute of Physical Chemistry 'Ilie Murgulescu' of Romanian Academy, Laboratory of Catalysis and Surface Chemistry, Spl. Independentei 202, 060021 Bucharest (Romania)

2010-09-15T23:59:59.000Z

230

Quantum oscillations and subband properties of the two-dimensional electron gas at the LaAlO{sub 3}/SrTiO{sub 3} interface  

SciTech Connect (OSTI)

We have performed high field magnetotransport measurements to investigate the interface electron gas in a high mobility SrTiO{sub 3}/SrCuO{sub 2}/LaAlO{sub 3}/SrTiO{sub 3} heterostructure. Shubnikov-de Haas oscillations reveal several 2D conduction subbands with carrier effective masses of 0.9m{sub e} and 2m{sub e}, quantum mobilities of order 2000 cm{sup 2}/V s, and band edges only a few millielectronvolts below the Fermi energy. Measurements in tilted magnetic fields confirm the 2D character of the electron gas, and show evidence of inter-subband scattering.

McCollam, A., E-mail: A.McCollam@science.ru.nl; Guduru, V. K.; Zeitler, U.; Maan, J. C. [High Field Magnet Laboratory and Institute for Molecules and Materials, Radboud University Nijmegen, 6525 ED Nijmegen (Netherlands); Wenderich, S.; Kruize, M. K.; Molegraaf, H. J. A.; Huijben, M.; Koster, G.; Blank, D. H. A.; Rijnders, G.; Brinkman, A.; Hilgenkamp, H. [Faculty of Science and Technology and MESA Institute for Nanotechnology, University of Twente, 7500 AE Enschede (Netherlands)

2014-02-01T23:59:59.000Z

231

Excellent Passivation and Low Reflectivity Al2O3/TiO2 Bilayer Coatings for n-Wafer Silicon Solar Cells: Preprint  

SciTech Connect (OSTI)

A bilayer coating of Al2O3 and TiO2 is used to simultaneously achieve excellent passivation and low reflectivity on p-type silicon. This coating is targeted for achieving high efficiency n-wafer Si solar cells, where both passivation and anti-reflection (AR) are needed at the front-side p-type emitter. It could also be valuable for front-side passivation and AR of rear-emitter and interdigitated back contact p-wafer cells. We achieve high minority carrier lifetimes {approx}1 ms, as well as a nearly 2% decrease in absolute reflectivity, as compared to a standard silicon nitride AR coating.

Lee, B. G.; Skarp, J.; Malinen, V.; Li, S.; Choi, S.; Branz, H. M.

2012-06-01T23:59:59.000Z

232

Elevated-Temperature Corrosion of CoCrCuFeNiAl0.5Bx High-Entropy Alloys in Simulated Syngas Containing H2S  

SciTech Connect (OSTI)

High-entropy alloys are formed by synthesizing five or more principal elements in equimolar or near equimolar concentrations. Microstructure of the CoCrCuFeNiAl{sub 0.5}B{sub x} (x = 0, 0.2, 0.6, 1) high-entropy alloys under investigation is composed of a mixture of disordered bcc and fcc phases and borides. These alloys were tested gravimetrically for their corrosion resistance in simulated syngas containing 0, 0.01, 0.1, and 1 % H{sub 2}S at 500 °C. The exposed coupons were characterized using XRD and SEM. No significant corrosion was detected at 500 °C in syngas containing 0 and 0.01 % H{sub 2}S while significant corrosion was observed in syngas containing 0.1 and 1 % H{sub 2}S. Cu{sub 1.96}S was the primary sulfide in the external corrosion scale on the low-boron high-entropy alloys, whereas FeCo{sub 4}Ni{sub 4}S{sub 8} on the high-boron high-entropy alloys. Multi-phase Cu-rich regions in the low-B high-entropy alloys were vulnerable to corrosive attack.

Dogan, Omer N.; Nielsen, Benjamin C.; Hawk, Jeffrey A.

2013-08-01T23:59:59.000Z

233

Laser damage properties of TiO{sub 2}/Al{sub 2}O{sub 3} thin films grown by atomic layer deposition  

SciTech Connect (OSTI)

Research on thin film deposited by atomic layer deposition (ALD) for laser damage resistance is rare. In this paper, it has been used to deposit TiO{sub 2}/Al{sub 2}O{sub 3} films at 110 deg. C and 280 deg. C on fused silica and BK7 substrates. Microstructure of the thin films was investigated by x-ray diffraction. The laser-induced damage threshold (LIDT) of samples was measured by a damage test system. Damage morphology was studied under a Nomarski differential interference contrast microscope and further checked under an atomic force microscope. Multilayers deposited at different temperatures were compared. The results show that the films deposited by ALD had better uniformity and transmission; in this paper, the uniformity is better than 99% over 100 mm {Phi} samples, and the transmission is more than 99.8% at 1064 nm. Deposition temperature affects the deposition rate and the thin film microstructure and further influences the LIDT of the thin films. As to the TiO{sub 2}/Al{sub 2}O{sub 3} films, the LIDTs were 6.73{+-}0.47 J/cm{sup 2} and 6.5{+-}0.46 J/cm{sup 2} at 110 deg. C on fused silica and BK7 substrates, respectively. The LIDTs at 110 deg. C are notably better than 280 deg. C.

Wei Yaowei; Liu Hao; Sheng Ouyang; Liu Zhichao; Chen Songlin; Yang Liming

2011-08-20T23:59:59.000Z

234

Dissolved trace metals (Ni, Zn, Co, Cd, Pb, Al, and Mn) around the Crozet Islands, Southern Ocean  

E-Print Network [OSTI]

of trace elements such as Zn, Co, and Cd may be influenced by complexing ligands [e.g., Zn: Bruland, 1989; Ellwood and van den Berg, 2000; Co: Ellwood and van den Berg, 2001; Saito et al., 2004; Cd: Bruland, 1992

Paris-Sud XI, Université de

235

Xe films on a decagonal Al-Ni-Co quasicrystalline surface Wahyu Setyawan,1 Nicola Ferralis,2 Renee D. Diehl,2 Milton W. Cole,2 and Stefano Curtarolo1,  

E-Print Network [OSTI]

D. Diehl,2 Milton W. Cole,2 and Stefano Curtarolo1, * 1Department of Mechanical Engineering 2005; revised manuscript received 9 May 2006; published 28 September 2006 The grand canonical Monte of the decagonal Al73Ni10Co17 quasicrystal QC using the grand canonical Monte Carlo sim

Curtarolo, Stefano

236

Potential-well depth at amorphous-LaAlO{sub 3}/crystalline-SrTiO{sub 3} interfaces measured by optical second harmonic generation  

SciTech Connect (OSTI)

By a combination of optical second harmonic generation and transport measurements, we have investigated interfaces formed by either crystalline or amorphous thin films of LaAlO{sub 3} grown on TiO{sub 2}-terminated SrTiO{sub 3}(001) substrates. Our approach aims at disentangling the relative role of intrinsic and extrinsic doping mechanisms in the formation of the two-dimensional electron gas. The different nature of the two mechanisms is revealed when comparing the sample response variation as a function of temperature during annealing in air. However, before the thermal treatment, the two types of interfaces show almost the same intensity of the second harmonic signal, provided the overlayer thickness is the same. As we will show, the second harmonic signal is proportional to the depth of the potential well confining the charges at the interface. Therefore, our result demonstrates that this depth is about the same for the two different material systems. This conclusion supports the idea that the electronic properties of the two-dimensional electron gas are almost independent of the doping mechanism of the quantum well.

De Luca, Gabriele; Rubano, Andrea; Gennaro, Emiliano di; Khare, Amit; Granozio, Fabio Miletto; Uccio, Umberto Scotti di; Marrucci, Lorenzo; Paparo, Domenico, E-mail: domenico.paparo@spin.cnr.it [CNR-SPIN and Dipartimento di Fisica, Universitŕ di Napoli “Federico II,” Compl. Univ. di Monte S. Angelo, v. Cintia, 80126 Napoli (Italy)

2014-06-30T23:59:59.000Z

237

Effects of Reduction Temperature and Metal-Support Interactions on the Catalytic Activity of Pt/g-Al2O3 and Pt/TiO2 for the Oxidation of CO in the Presence and Absence of H2.  

SciTech Connect (OSTI)

TiO2- and -Al2O3-supported Pt catalysts were characterized by HRTEM, XPS, EXAFS, and in situ FTIR spectroscopy after activation at various conditions, and their catalytic properties were examined for the oxidation of CO in the absence and presence of H2 (PROX). When {gamma}-Al{sub 2}O{sub 3} was used as the support, the catalytic, electronic, and structural properties of the Pt particles formed were not affected substantially by the pretreatment conditions. In contrast, the surface properties and catalytic activity of Pt/TiO2 were strongly influenced by the pretreatment conditions. In this case, an increase in the reduction temperature led to higher electron density on Pt, altering its chemisorptive properties, weakening the Pt-CO bonds, and increasing its activity for the oxidation of CO. The in situ FTIR data suggest that both the terminal and bridging CO species adsorbed on fully reduced Pt are active for this reaction. The high activity of Pt/TiO2 for the oxidation of CO can also be attributed to the ability of TiO2 to provide or stabilize highly reactive oxygen species at the metal-support interface. However, such species appear to be more reactive toward H{sub 2} than CO. Consequently, Pt/TiO{sub 2} shows substantially lower selectivities toward CO oxidation under PROX conditions than Pt/{gamma}-Al{sub 2}O{sub 3}.

Alexeev,O.; Chin, S.; Engelhard, M.; Ortiz-Soto, L.; Amiridis, M.

2005-01-01T23:59:59.000Z

238

Role of oxygen vacancies in magnetic properties of LaAlO{sub 3}/SrTiO{sub 3} interface  

SciTech Connect (OSTI)

The interface of two band-insulators SrTiO{sub 3} and LaAlO{sub 3} exhibits a highly conducting two-dimensional electron gas which shows low-temperature superconductivity, ferromagnetism and many other novel properties. Several studies reveal that the oxygen vacancies at the interface have strong influence on the electronic and magnetic properties of the interface electrons. Here, we develop an insight into the effects of oxygen vacancies on the magnetic properties of the system; the oxygen vacancies help in establishing ferromagnetism which competes with superconductivity at low temperatures. Simulated Monte-Carlo annealing suggests an ordering of the oxygen vacant sites and sheds light on the experimental observation of the quenching of magnetic moment on annealing. A possible explanation for the coexistence of superconductivity and ferromagnetism is also discussed.

Mohanta, N., E-mail: nmohanta@phy.iitkgp.ernet.in [Department of Physics and Meteorology, Indian Institute of Technology Kharagpur, West Bengal-721302 (India); Taraphder, A. [Department of Physics and Meteorology, Indian Institute of Technology Kharagpur, West Bengal-721302, India and Centre for Theoretical Studies, Indian Institute of Technology Kharagpur, West Bengal-721302 (India)

2014-04-24T23:59:59.000Z

239

Formation of mixed oxide powders in flames: Part II. SiO sub 2 --GeO sub 2 and Al sub 2 O sub 3 --TiO sub 2  

SciTech Connect (OSTI)

SiO{sub 2}--GeO{sub 2} and Al{sub 2}O{sub 3}--TiO{sub 2} mixed oxide powders were synthesized using a counterflow diffusion flame burner. SiCl{sub 4}, GeCl{sub 4}, Al(CH{sub 3}){sub 3}, and TiCl{sub 4} were used as source materials for the formation of oxide particles in hydrogen-oxygen flames. {ital In} {ital situ} particle sizes were determined using dynamic light-scattering. Powders were collected using two different methods, a thermophoretic method (particles are collected onto carbon coated TEM grids) and an electrophoretic method (particles are collected onto stainless steel strips). Their size, morphology, and crystalline form were examined using a transmission electron microscope and an x-ray diffractometer. A photomultiplier at 90{degree} to the argon ion laser beam was used to measure the light-scattering intensity. The formation of the mixed oxides was investigated using Si to Ge and Al to Ti ratios of 3:5 and 1:1, respectively. Heterogeneous nucleation of the SiO{sub 2} on the surface of the GeO{sub 2} was observed. In Al{sub 2}O{sub 3}--TiO{sub 2} mixtures, both oxide particles form at the same temperature. X-ray diffraction analysis of particles sampled at temperatures higher than 1553 K showed the presence of rutile, {gamma}--Al{sub 2}O{sub 3}, and aluminum titanate. Although the particle formation processes for SiO{sub 2}--GeO{sub 2} is very different from that for Al{sub 2}O{sub 3}--TiO{sub 2}, both mixed oxides result in very uniform mixtures.

Hung, C.; Miquel, P.F.; Katz, J.L. (Department of Chemical Engineering, The Johns Hopkins University, Baltimore, Maryland 21218 (United States))

1992-07-01T23:59:59.000Z

240

Effects of testing and storage environments on mechanical properties of Ni-plated and bare U-3/4 wt% Ti  

SciTech Connect (OSTI)

It was found that storage environments with an adequate supply of oxygen can effectively minimize moisture corrosion of bare U-3/4 Ti. In particular, 0.75 cm/sup 3/ of dry air is calculated to protect 1 cm/sup 2/ of U-3/4 Ti for 20 years storage at room temperature. Consideration of the geometric details of U-3/4 Ti alloy specimens and the free volumes of air (and hence O/sub 2/) available can satisfactorily explain discrepancies in corrosion behavior between recent tests and previously reported data. The storage environment at 70/sup 0/C produces a minor strength increase in bare samples with increasing time. Decreases in ductility are observed for testing conditions of low temperature, low strain rate, and/or high humidity. Surface cracks occur under the same conditions conducive to corrosion, i.e., moderate temperatures, low strain rates, and high humidity. Significant increases in strength result under low-temperature and high-strain-rate conditions of tensile testing. Residual chloride contamination may be responsible for the occasional and otherwise unexplained large scatter in ductility for nominally similar specimens and test conditions. Nickel plating is observed to cause a statistically significant decrease in tensile strength, but no effect on the yield strength or ductility was observed and the presence of high explosive during the aging of tensile bars was observed to have no effect on mechanical properties.

Zehr, S.W.; Johnson, H.R.; Smugeresky, J.E.; Pashman, K.A.; Nagelberg, A.S.

1980-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "ni ti al" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


241

SCC of austenitic stainless steel, Ni-21Cr-13.5Mo alloy, and 0.3Mo-0.8Ni-Ti in 350 C synthetic, NO{sub 2}2-NO{sub 3}-OH tank waste  

SciTech Connect (OSTI)

A necessary step in preparation of high-level radioactive tank waste for sate disposal is removal of non radioactive organic and inorganic components from washed waste. The oxidizing and alkaline nature of most wastes allows the removal of the organic components as water vapor, carbon dioxide, and ammonia gas merely by heating the wastes to no more than 350 C. Type 3 16L stainless steel (UNS S3 1603) a 21Cr-13.5Mo-Ni alloy (UNS N06022), and 0.8Ni-0.3Mo-Ti alloy (UNS R53400) were candidate materials for reactors in which the oxidation could be performed. Slow-strain-rate tests were performed on these three materials at a strain rate of 10{sup {minus}6}sec{sup {minus}1} in a diluted waste type solution containing 4.1% NO{sub 2}, 3.7% NO{sub 3}, 1% OH, and 0.22% TIC. All three materials showed intergranular stress corrosion cracking with substantial losses in ductility and strength.

Pednekar, S.P. [Army Research Lab., Aberdeen Proving Ground, MD (United States)

1998-12-31T23:59:59.000Z

242

Alpha phase precipitation from phase-separated beta phase in a model Ti-Mo-Al alloy studied by direct coupling of transmission electron microscopy and atom probe tomography  

SciTech Connect (OSTI)

The benefit of direct coupling of APT with TEM dark field imaging to investigate early stages of phase transformation in multicomponent alloys is demonstrated by analyzing alpha phase precipitated in a model Ti-10 at% Mo-10 at% Al alloy during annealing at 400oC. Through such a direct coupling approach a thermodynamically unexpected solute partitioning trend between beta matrix and alpha precipitate is observed in the early stages of precipitation, which is explained based on possible nucleation of alpha phase in the Ti rich (Mo and Al depleted regions) created as a result of phase separation in beta matrix. On further higher temperature annealing at 600oC for 1 hour, the alpha precipitates were shown to grow and get enriched in Al and further depleted in Mo reaching the thermodynamic equilibrium.

Devaraj, Arun; Nag, Soumya; Banerjee, Rajarshi

2013-10-19T23:59:59.000Z

243

CoNiGa High Temperature Shape Memory Alloys  

E-Print Network [OSTI]

commercially successful SMAs such as NiTi and Cu-based alloys. In recent years, the CoNiGa system has emerged as a new ferromagnetic shape memory alloy with some compositions exhibiting high martensitic transformation temperatures which makes CoNiGa a potential...

Dogan, Ebubekir

2011-10-21T23:59:59.000Z

244

Effect of the strain-induced melt activation (SIMA) process on the tensile properties of a new developed super high strength aluminum alloy modified by Al-5Ti-1B grain refiner  

SciTech Connect (OSTI)

In this study, the effect of Al-5Ti-1B grain refiners and modified strain-induced melt activation process on an Al-Zn-Mg-Cu alloy was studied. The optimum level of Ti was found to be 0.1 wt.%. The specimens subjected to deformation ratio of 40% (at 300 Degree-Sign C) and various heat treatment times (10-40 min) and temperature (550-600 Degree-Sign C) regimes were characterized in this study. Reheating condition to obtain a fine globular microstructure was optimized. Microstructural examinations were conducted by optical and scanning electron microscopy coupled with an energy dispersive spectrometry. The optimum temperature and time in strain-induced melt activation process are 575 Degree-Sign C and 20 min, respectively. T6 heat treatment including quenching to room temperature and aging at 120 Degree-Sign C for 24 h was employed to reach to the maximum strength. Significant improvements in mechanical properties were obtained with the addition of grain refiner combined with T6 heat treatment. After the T6 heat treatment, the average tensile strength increased from 283 MPa to 587 and 332 MPa to 617 for samples refined with 2 wt.% Al-5Ti-1B before and after strain-induced melt activation process and extrusion process, respectively. Ultimate strength of Ti-refined specimens without SIMA process has a lower value than globular microstructure specimens after SIMA and extrusion process. - Highlights: Black-Right-Pointing-Pointer The effect of Al-5Ti-1B on the aluminum alloy produced by SIMA process was studied. Black-Right-Pointing-Pointer Al-5Ti-1B is an effective in reducing the grain and reagent fine microstructure. Black-Right-Pointing-Pointer Reheating condition to obtain a fine globular microstructure was optimized. Black-Right-Pointing-Pointer The optimum temperature and time in SIMA process are 575 Degree-Sign C and 20 min respectively. Black-Right-Pointing-Pointer UTS of globular structure specimens have a more value than Ti-refined specimens.

Haghparast, Amin [School of Mechanical Engineering, College of Engineering, University of Tehran, Tehran (Iran, Islamic Republic of)] [School of Mechanical Engineering, College of Engineering, University of Tehran, Tehran (Iran, Islamic Republic of); Nourimotlagh, Masoud [Young Researchers Club, Dareshahr Branch, Islamic Azad university (Iran, Islamic Republic of)] [Young Researchers Club, Dareshahr Branch, Islamic Azad university (Iran, Islamic Republic of); Alipour, Mohammad, E-mail: Alipourmo@ut.ac.ir [School of Metallurgy and Materials Engineering, University of Tehran, Tehran (Iran, Islamic Republic of)] [School of Metallurgy and Materials Engineering, University of Tehran, Tehran (Iran, Islamic Republic of)

2012-09-15T23:59:59.000Z

245

al coated a2: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

2 AlTiN layer effect on mechanical properties of Ti-doped diamond-like carbon composite coatings Engineering Websites Summary: AlTiN layer effect on mechanical properties...

246

Crystal structure, magnetism and transport properties of Ce{sub 3}Ni{sub 25.75}Ru{sub 3.16}Al{sub 4.1}B{sub 10}  

SciTech Connect (OSTI)

Single crystals of Ce{sub 3}Ni{sub 25.75}Ru{sub 3.16}Al{sub 4.1}B{sub 10} were obtained from a process in which a polycrystalline sample of CeRu{sub 2}Al{sub 2}B was annealed in an excess of a Ni–In flux. The initial phase, CeRu{sub 2}Al{sub 2}B, does not recrystallize, instead, crystals of a new phase, Ce{sub 3}Ni{sub 25.75}Ru{sub 3.16}Al{sub 4.1}B{sub 10}, could be isolated once the flux was removed. The title compound crystallizes in the tetragonal space group P4/nmm (No. 129) with a=1139.02(8), c=801.68(6) pm (c/a=0.70) in the Nd{sub 3}Ni{sub 29}Si{sub 4}B{sub 10} structure type. Electrical resistivity measurements reveal metallic behavior with a minimum of 700 µ? cm and a small residual resistivity ratio of RRR=1.4 indicating a large amount of disorder scattering. The cerium atoms are either in the 4+ or an intermediate valence state with a valence fluctuation temperature far above room temperature. - Graphical abstract: Single crystals of Ce{sub 3}Ni{sub 25.75}Ru{sub 3.16}A{sub l4.1}B{sub 10} were obtained using a process in which a polycrystalline sample of CeRu{sub 2}Al{sub 2}B was annealed in an excess of a Ni–In flux. Electrical resistivity measurements reveal metallic behavior with a minimum of 700 ?? cm and a small residual resistivity ratio of RRR=1.4 indicating a large amount of disorder scattering. The cerium atoms are either in the 4+ or an intermediate valence state with a valence fluctuation temperature far above room temperature. Display Omitted - Highlights: • Flux synthesis of high quality single crystals of Ce{sub 3}Ni{sub 25.75}Ru{sub 3.16}Al{sub 4.1}B{sub 10} is presented along with the crystal structure, magnetic and transport properties. • The compound is isostructural to Nd{sub 3}Ni{sub 29}Si{sub 4}B{sub 10} but is first of this structure type showing mixed occupancies of d-elements. • This is an intermetallic phase with Ce in either the 4+ or an intermediate valence state. • The fact that this structure with mixed occupied transition metal sites exists suggests that more compounds of this type should be accessible and the physical properties tuned.

Janka, Oliver [Department of Chemistry, University of California, One Shields Ave, Davis, CA 95616 (United States); Baumbach, Ryan E.; Thompson, Joe D. [Los Alamos National Laboratory, Los Alamos, NM 87545 (United States); Bauer, Eric D., E-mail: edbauer@lanl.gov [Los Alamos National Laboratory, Los Alamos, NM 87545 (United States); Kauzlarich, Susan M., E-mail: smkauzlarich@ucdavis.edu [Department of Chemistry, University of California, One Shields Ave, Davis, CA 95616 (United States)

2013-09-15T23:59:59.000Z

247

Femtosecond laser-induced periodic surface structure on the Ti-based nanolayered thin films  

SciTech Connect (OSTI)

Laser-induced periodic surface structures (LIPSSs) and chemical composition changes of Ti-based nanolayered thin films (Al/Ti, Ni/Ti) after femtosecond (fs) laser pulses action were studied. Irradiation is performed using linearly polarized Ti:Sapphire fs laser pulses of 40 fs pulse duration and 800 nm wavelength. The low spatial frequency LIPSS (LSFL), oriented perpendicular to the laser polarization with periods slightly lower than the irradiation wavelength, was typically formed at elevated laser fluences. On the contrary, high spatial frequency LIPSS (HSFL) with uniform period of 155 nm, parallel to the laser light polarization, appeared at low laser fluences, as well as in the wings of the Gaussian laser beam distribution for higher used fluence. LSFL formation was associated with the material ablation process and accompanied by the intense formation of nanoparticles, especially in the Ni/Ti system. The composition changes at the surface of both multilayer systems in the LSFL area indicated the intermixing between layers and the substrate. Concentration and distribution of all constitutive elements in the irradiated area with formed HSFLs were almost unchanged.

Petrovi?, Suzana M.; Gakovi?, B.; Peruško, D. [Institute of Nuclear Science—Vin?a, University of Belgrade, POB 522, 11001 Belgrade (Serbia)] [Institute of Nuclear Science—Vin?a, University of Belgrade, POB 522, 11001 Belgrade (Serbia); Stratakis, E. [Institute of Electronic Structure and Laser, Foundation for Research and Technology–Hellas, P.O. Box 1527, Gr-711 10 Heraklion (Greece) [Institute of Electronic Structure and Laser, Foundation for Research and Technology–Hellas, P.O. Box 1527, Gr-711 10 Heraklion (Greece); Department of Materials Science and Technology, University of Crete, 710 03 Heraklion, Crete (Greece); Bogdanovi?-Radovi?, I. [Ru?er Boškovi? Institute, P.O. Box 180, 10002 Zagreb (Croatia)] [Ru?er Boškovi? Institute, P.O. Box 180, 10002 Zagreb (Croatia); ?ekada, M. [Jožef Stefan Institute, Jamova 39, 1000 Ljubljana (Slovenia)] [Jožef Stefan Institute, Jamova 39, 1000 Ljubljana (Slovenia); Fotakis, C. [Institute of Electronic Structure and Laser, Foundation for Research and Technology–Hellas, P.O. Box 1527, Gr-711 10 Heraklion (Greece) [Institute of Electronic Structure and Laser, Foundation for Research and Technology–Hellas, P.O. Box 1527, Gr-711 10 Heraklion (Greece); Department of Physics, University of Crete, 714 09 Heraklion, Crete (Greece); Jelenkovi?, B. [Institute of Physics, University of Belgrade, Pregrevica 118, 11080 Belgrade (Serbia)] [Institute of Physics, University of Belgrade, Pregrevica 118, 11080 Belgrade (Serbia)

2013-12-21T23:59:59.000Z

248

FTIR study of hydrogen and carbon monoxide adsorption on Pt/TiO{sub 2}, Pt/ZrO{sub 2}, and Pt/Al{sub 2}O{sub 3}  

SciTech Connect (OSTI)

The Pt/TiO{sub 2}, Pt/ZrO{sub 2}, and Pt/Al{sub 2}O{sub 3} catalysts submitted to low-temperature reduction (LTR,200 C) and high-temperature reduction (HTR, 500 C) and exposed to hydrogen and carbon monoxide at room temperature were studied by infrared spectroscopy. There is a strong loss of transmission in the entire infrared spectra on Pt/TiO{sub 2} after its exposure to hydrogen, which is related to the reducibility of the support. A typical SMSI behavior (strong metal-support interaction), such as the decrease in carbon monoxide adsorption capacity, was detected on Pt/TiO{sub 2} and Pt/ZrO{sub 2} after exposure to hydrogen, even for the catalysts submitted to LTR treatment. Also a carbonyl band shift to lower wavenumber was observed on LTR-treated Pt/TiO{sub 2}, Pt/ZrO{sub 2}, and Pt/Al{sub 2}O{sub 3} after exposure to hydrogen. The authors interpreted this SMSI behavior as an electronic rather than morphological effect, which was induced by the presence of hydrogen spillover.

Benvenutti, E.V.; Franken, L.; Moro, C.C.; Davanzo, C.U.

1999-11-09T23:59:59.000Z

249

ZnO-Al2O3 and ZnO-TiO2 Core-Shell Nanowire Dye-Sensitized Solar Cells Matt Law,, Lori E. Greene,, Aleksandra Radenovic, Tevye Kuykendall,,  

E-Print Network [OSTI]

ZnO-Al2O3 and ZnO-TiO2 Core-Shell Nanowire Dye-Sensitized Solar Cells Matt Law,,§ Lori E. Greene the construction and performance of dye-sensitized solar cells (DSCs) based on arrays of ZnO nanowires coated loadings through an increase in nanowire array surface area. Introduction Dye-sensitized solar cells (DSCs

Yang, Peidong

250

Au/MxOy/TiO2 catalysts for CO oxidation: promotional effect of main-group, transition, and rare-earth metal oxide additives.  

SciTech Connect (OSTI)

Au/TiO2 catalysts are active for CO oxidation, but they suffer from high-temperature sintering of the gold particles, and few attempts have been made to promote or stabilize Au/TiO2. Our recent communication addressed these issues by loading gold onto Al2O3/TiO2 prepared via surface-sol-gel processing of Al(sec-OC4H9)3 on TiO2. In our current full paper, Au/Al2O3/TiO2 catalysts were prepared alternatively by thermal decomposition of Al(NO3)3 on TiO2 followed by loading gold, and the influences of the decomposition temperature and Al2O3 content were systematically surveyed. This facile method was subsequently extended to the preparation of a battery of metal oxide-modified Au/TiO2 catalysts virtually not reported. It was found that Au/TiO2 modified by CaO, NiO, ZnO, Ga2O3, Y2O3, ZrO2, La2O3, Pr2O3, Nd2O3, Sm2O3, Eu2O3, Gd2O3, Dy2O3, Ho2O3, Er2O3, or Yb2O3 could retain significant activity at ambient temperature even after aging in O2-He at 500 C, whereas unmodified Au/TiO2 lost its activity. Moreover, some 200 C-calcined promoted catalysts showed high activity even at about -100 C. The deactivation and regeneration of some of these new catalysts were studied. This work furnished novel catalysts for further fundamental and applied research.

Ma, Zhen [ORNL; Overbury, Steven {Steve} H [ORNL; Dai, Sheng [ORNL

2007-01-01T23:59:59.000Z

251

Structure and phase transformation behaviour of electroless Ni-P composite coatings  

SciTech Connect (OSTI)

This paper addresses the structural characteristics and phase transformation behaviour of plain electroless Ni-P coating and electroless Ni-P-Si{sub 3}N{sub 4}, Ni-P-CeO{sub 2} and Ni-P-TiO{sub 2} composite coatings. The X-ray diffraction patterns of electroless Ni-P-Si{sub 3}N{sub 4}, Ni-P-CeO{sub 2} and Ni-P-TiO{sub 2} composite coatings are very similar to that of plain electroless Ni-P coating, both in as plated and heat-treated conditions. Selected area electron diffraction (SAED) patterns obtained on the Ni-P matrix of Ni-P-Si{sub 3}N{sub 4}, Ni-P-CeO{sub 2} and Ni-P-TiO{sub 2} composite coatings exhibit diffuse ring patterns resembling the one obtained for plain electroless Ni-P coating. Phase transformation behaviour studied by differential scanning calorimetry (DSC) indicates that the variation in crystallization temperature and the energy evolved during crystallization of plain electroless Ni-P coating and electroless Ni-P-Si{sub 3}N{sub 4}, Ni-P-CeO{sub 2} and Ni-P-TiO{sub 2} composite coatings is not significant. The study concludes that incorporation of Si{sub 3}N{sub 4}, CeO{sub 2} and TiO{sub 2} particles in the Ni-P matrix does not have any influence on the structure and phase transformation behaviour of electroless Ni-P coatings.

Balaraju, J.N. [Surface Engineering Division, National Aerospace Laboratory, Bangalore 560017 (India)]. E-mail: jnbalraj@css.nal.res.in; Narayanan, T.S.N. Sankara [National Metallurgical Laboratory, Madras Centre, CSIR Complex Taramani, Chennai 600113 (India)]. E-mail: tsnsn@rediffmail.com; Seshadri, S.K. [Department of Metallurgical Engineering, Indian Institute of Technology Madras, Chennai 600036 (India)]. E-mail: sks@iitm.ac.in

2006-04-13T23:59:59.000Z

252

Bench- and Pilot-Scale Studies of Reaction and Regeneration of Ni-Mg-K/Al2O3 for Catalytic Conditioning of Biomass-Derived Syngas  

SciTech Connect (OSTI)

The National Renewable Energy Laboratory (NREL) is collaborating with both industrial and academic partners to develop technologies to help enable commercialization of biofuels produced from lignocellulosic biomass feedstocks. The focus of this paper is to report how various operating processes, utilized in-house and by collaborators, influence the catalytic activity during conditioning of biomass-derived syngas. Efficient cleaning and conditioning of biomass-derived syngas for use in fuel synthesis continues to be a significant technical barrier to commercialization. Multifunctional, fluidizable catalysts are being developed to reform undesired tars and light hydrocarbons, especially methane, to additional syngas, which can improve utilization of biomass carbon. This approach also eliminates both the need for downstream methane reforming and the production of an aqueous waste stream from tar scrubbing. This work was conducted with NiMgK/Al{sub 2}O{sub 3} catalysts. These catalysts were assessed for methane reforming performance in (i) fixed-bed, bench-scale tests with model syngas simulating that produced by oak gasification, and in pilot-scale, (ii) fluidized tests with actual oak-derived syngas, and (iii) recirculating/regenerating tests using model syngas. Bench-scale tests showed that the catalyst could be completely regenerated over several reforming reaction cycles. Pilot-scale tests using raw syngas showed that the catalyst lost activity from cycle to cycle when it was regenerated, though it was shown that bench-scale regeneration by steam oxidation and H{sub 2} reduction did not cause this deactivation. Characterization by TPR indicates that the loss of a low temperature nickel oxide reduction feature is related to the catalyst deactivation, which is ascribed to nickel being incorporated into a spinel nickel aluminate that is not reduced with the given activation protocol. Results for 100 h time-on-stream using a recirculating/regenerating reactor suggest that this type of process could be employed to keep a high level of steady-state reforming activity, without permanent deactivation of the catalyst. Additionally, the differences in catalyst performance using a simulated and real, biomass-derived syngas stream indicate that there are components present in the real stream that are not adequately modeled in the syngas stream. Heavy tars and polycyclic aromatics are known to be present in real syngas, and the use of benzene and naphthalene as surrogates may be insufficient. In addition, some inorganics found in biomass, which become concentrated in the ash following biomass gasification, may be transported to the reforming reactor where they can interact with catalysts. Therefore, in order to gain more representative results for how a catalyst would perform on an industrially-relevant scale, with real contaminants, appropriate small-scale biomass solids feeders or slip-streams of real process gas should be employed.

Magrini-Bair, K. A.; Jablonski, W. S.; Parent, Y. O.; Yung, M. M.

2012-05-01T23:59:59.000Z

253

Combustion synthesis/quasi-isostatic pressing of TiCNiTi cermets: processing and mechanical response  

E-Print Network [OSTI]

were produced by a technique combining self-propagating high-temperature synthesis (SHS) of elemental- transmitting medium. Self-propagating high-temperature synthesis (SHS) uses the energy of the exothermicCombustion synthesis/quasi-isostatic pressing of TiC­NiTi cermets: processing and mechanical

Meyers, Marc A.

254

Bubble microstructure evolution and helium behavior in He{sup +} implanted Ni-base alloys  

SciTech Connect (OSTI)

Behavior of ion-implanted helium in Ni as a function of alloying element concentration (Al or Ti) and irradiation conditions (at 20 or 750 C) have been investigated by means of thermal desorption spectrometry (TDS) and transmission electron microscopy (TEM). Substitution elements in solid solution were demonstrated to have substantial influence on the evolution of implanted helium, shifting the TDS spectrum peaks to higher temperature region and increasing the quantity of helium remaining in the samples after long-time postirradiation annealing. TEM investigations showed that in the case of postirradiation annealing, helium bubbles are formed earlier in quenched alloys than in those annealed.

Kalin, B.A.; Chernov, I.I.; Kalashnikov, A.N.; Solovyev, B.G. [Moscow State Engineering Physics Inst., Moscow (Russian Federation). Dept. of Physical Problems of Materials Science

1996-12-31T23:59:59.000Z

255

Dielectric spectroscopy of Pb{sub 0.92}La{sub 0.08}Zr{sub 0.52}Ti{sub 0.48}O{sub 3} films on hastelloy substrates with and without LaNiO{sub 3} buffer layers.  

SciTech Connect (OSTI)

Pb{sub 0.92}La{sub 0.08}Zr{sub 0.52}Ti{sub 0.48}O{sub 3} (PLZT) films were deposited by sol-gel synthesis on Hastelloy substrates with and without a LaNiO{sub 3} buffer. The dielectric properties were measured as a function of temperature and frequency to study the cause of dielectric degradation in PLZT films directly on hastelloy substrates. These measurements indicated an increased charge carrier activity in films without a buffer layer. We propose that a region of the film closer to the substrate surface is more oxygen deficient than the bulk and is responsible for the degradation in properties rather than the presence of a low parasitic secondary-phase interfacial layer such as NiO{sub x}.

Narayanan, M.; Ma, B.; Balachandran, U.; Li, W.

2010-01-01T23:59:59.000Z

256

Dielectric spectroscopy of Pb{sub 0.92}La{sub 0.08}Zr{sub 0.52}Ti{sub0.48}O{sub 3} films on hastealloy substrates with and without LaNiO{sub 3} buffer layers.  

SciTech Connect (OSTI)

Pb{sub 0.92}La{sub 0.08}Zr{sub 0.52}Ti{sub 0.48}O{sub 3} (PLZT) films were deposited by sol-gel synthesis on Hastelloy substrates with and without a LaNiO{sub 3} buffer. The dielectric properties were measured as a function of temperature and frequency to study the cause of dielectric degradation in PLZT films directly on hastelloy substrates. These measurements indicated an increased charge carrier activity in films without a buffer layer. We propose that a region of the film closer to the substrate surface is more oxygen deficient than the bulk and is responsible for the degradation in properties rather than the presence of a low parasitic secondary-phase interfacial layer such as NiO{sub x}.

Narayanan, M.; Ma, B.; Balachandran, U.; Li, W. (Energy Systems); ( MSD)

2010-01-01T23:59:59.000Z

257

Effect of build geometry on the ?-grain structure and texture in additive manufacture of Ti-6Al-4V by selective electron beam melting  

SciTech Connect (OSTI)

With titanium alloys, the solidification conditions in Additive Manufacturing (AM) frequently lead to coarse columnar ?-grain structures. The effect of geometry on the variability in the grain structure and texture, seen in Ti-6Al-4V alloy components produced by Selective Electron Beam Melting (SEBM), has been investigated. Reconstruction of the primary ?-phase, from ?-phase EBSD data, has confirmed that in bulk sections where in-fill “hatching” is employed growth selection favours columnar grains aligned with an <001> {sub ?} direction normal to the deposited powder layers; this results in a coarse ?-grain structure with a strong < 001 > {sub ?} fibre texture (up 8 x random) that can oscillate between a near random distribution around the fibre axis and cube reinforcement with build height. It is proposed that this behaviour is related to the highly elongated melt pool and the raster directions alternating between two orthogonal directions every layer, which on average favours grains with cube alignment. In contrast, the outline, or “contour”, pass produces a distinctly different grain structure and texture resulting in a skin layer on wall surfaces, where nucleation occurs off the surrounding powder and growth follows the curved surface of the melt pool. This structure becomes increasingly important in thin sections. Local heterogeneities have also been found within different section transitions, resulting from the growth of skin grain structures into thicker sections. Texture simulations have shown that the far weaker ?-texture (? 3 x random), seen in the final product, arises from transformation on cooling occurring with a near random distribution of ?-plates across the 12 variants possible from the Burgers relationship. - Highlights: • Distinctly different skin and bulk structures are produced by the contour and hatching passes. • Bulk sections contain coarse ?-grains with a < 001 > fibre texture in the build direction. • This oscillates between a random distribution around the axis and cube reinforcement. • In the skin layer nucleation occurs off the surrounding powder bed and growth occurs inwards. • Simulations show that a weak ?-texture results from a random distribution across habit variants.

Antonysamy, A.A., E-mail: alphons.antonysamy@GKNAerospace.com [Additive Manufacturing Centre, GKN Aerospace, P.O. Box 500, Golf Course Lane, Filton, BS34 9 AU (United Kingdom); Meyer, J., E-mail: jonathan.meyer@eads.com [EADS Innovation Works, 20A1 Building, Golf Course Lane, Filton, Bristol, BS997AR (United Kingdom); Prangnell, P.B., E-mail: philip.prangnell@manchester.ac.uk [School of Materials, University of Manchester, Manchester M13 9PL (United Kingdom)

2013-10-15T23:59:59.000Z

258

DC current induced metal-insulator transition in epitaxial Sm{sub 0.6}Nd{sub 0.4}NiO{sub 3}/LaAlO{sub 3} thin film  

SciTech Connect (OSTI)

The metal-insulator transition (MIT) in strong correlated electron materials can be induced by external perturbation in forms of thermal, electrical, optical, or magnetic fields. We report on the DC current induced MIT in epitaxial Sm{sub 0.6}Nd{sub 0.4}NiO{sub 3} (SNNO) thin film deposited by pulsed laser deposition on (001)-LaAlO{sub 3} substrate. It was found that the MIT in SNNO film not only can be triggered by thermal, but also can be induced by DC current. The T{sub MI} of SNNO film decreases from 282 K to 200 K with the DC current density increasing from 0.003 × 10{sup 9} A•m{sup ?2} to 4.9 × 10{sup 9} A•m{sup ?2}. Based on the resistivity curves measured at different temperatures, the MIT phase diagram has been successfully constructed.

Huang, Haoliang [Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026 (China) [Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026 (China); CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, Anhui 230026 (China); Luo, Zhenlin, E-mail: zlluo@ustc.edu.cn; Yang, Yuanjun; Yang, Mengmeng; Wang, Haibo; Hu, Sixia; Bao, Jun [CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, Anhui 230026 (China) [CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, Anhui 230026 (China); National Synchrotron Radiation Laboratory and School of Nuclear Science and Technology, University of Science and Technology of China, Hefei, Anhui 230026 (China); Yun, Yu; Meng, Dechao; Lu, Yalin [CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, Anhui 230026 (China)] [CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, Anhui 230026 (China); Gao, Chen, E-mail: cgao@ustc.edu.cn [Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026 (China) [Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026 (China); CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, Anhui 230026 (China); National Synchrotron Radiation Laboratory and School of Nuclear Science and Technology, University of Science and Technology of China, Hefei, Anhui 230026 (China)

2014-05-15T23:59:59.000Z

259

Hai un'idea di impresa? La Regione Veneto ti aiuta a realizzarla La Direzione Lavoro della Regione Veneto partecipa al progetto I. E. SMART -Smart Training  

E-Print Network [OSTI]

Veneto partecipa al progetto I. E. SMART - Smart Training Network for Innovation and Entrepreneurship Competition è un concorso di idee che si svolge in più fasi: dal 1° agosto al 30 ottobre 2013 si raccolgono le idee presentate tramite il formulario on line che trovi collegandoti al seguente link: http

Romeo, Alessandro

260

Phase Relations and Elemental Distribution Among Co-Existing Phases in the Ceramics of the Pseudobinary System CaZrTi{sub 2}O{sub 7}-LnAlO{sub 3} (Ln= Nd, Sm)  

SciTech Connect (OSTI)

In the ceramics in series (1-x) CaZrTi{sub 2}O{sub 7} - x NdAlO{sub 3} and (1-x) CaZrTi{sub 2}O{sub 7} - x SmAlO{sub 3} (x = 0.25, 0.5 and 0.75) produced by cold pressing and sintering at 1400, 1450 and 1500 deg. C zirconolite was found to be a major phase, perovskite was an extra phase and traces of residual baddeleyite occurred. At x = 0.75 the perovskite was major phase and zirconolite and cubic oxide of fianite or tazheranite type were extra phases. Major Nd and Sm host phase at x = 0.25 was found to be zirconolite (about 65% of total Nd{sub 2}O{sub 3} and 74% of total Sm{sub 2}O{sub 3}). With the x value increasing perovskite becomes major host phase for Nd and Sm accumulating of up to about 92% of total Nd and about 72% of total Sm. As follows from SEM/EDS data Nd and Sm contents in the zirconolite may reach {approx}1 formula unit (fu). (authors)

Mikhailenko, Natalia [SIA Radon, Moscow, 119121 (Russian Federation); Stefanovsky, Sergey [Center of Advanced Technologies, SIA Radon, 7th Rostovskii lane 2/14, Moscow, 119121 (Russian Federation); Ochkin, Alexander [D. Mendeleev University of Chemical Technology, Moscow (Russian Federation)

2007-07-01T23:59:59.000Z

Note: This page contains sample records for the topic "ni ti al" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


261

Reactivity deterioration of NiO/Al{sub 2}O{sub 3} oxygen carrier for chemical looping combustion of coal in a 10 kW{sub th} reactor  

SciTech Connect (OSTI)

A relatively long-term experiment for chemical looping combustion of coal with NiO/Al{sub 2}O{sub 3} oxygen carrier was carried out in a 10 kW{sub th} continuous reactor of interconnected fluidized beds, and 100 h of operation was reached with the same batch of the oxygen carrier. The reactivity deterioration of the oxygen carriers was present during the experimental period. The reactivity deterioration of reacted oxygen carriers at different experimental stages was evaluated using X-ray diffraction (XRD), scanning electron microscope (SEM), and X-ray fluorescence spectrometer. SEM analysis showed no significant change in the morphology of the nickel-based oxygen carrier at the fuel reactor temperature {<=}940 C, but loss of surface area and porosity of reacted oxygen carriers was observed when the fuel reactor temperature exceeded 960 C. The results show that the sintering effect have mainly contributed to the reactivity deterioration of reacted oxygen carriers in the CLC process for coal, while the effects of coal ash and sulfur can be ignored. The oxidization of reduced oxygen carrier with air was an intensive exothermic process, and the high temperature of oxygen carrier particles led to sintering on the surface of oxygen carrier particles in the air reactor. Attention must be paid to control the external circulation of oxygen carrier particles in the interconnected fluidized beds in order to efficiently transport heat from the air reactor to the fuel reactor, and reduce the temperature of oxygen carrier particles in the air reactor. Improvement of reactivity deterioration of reacted oxygen carriers was achieved by the supplement of steam into the fuel reactor. Nevertheless, NiO/Al{sub 2}O{sub 3} is still one of the optimal oxygen carriers for chemical looping combustion of coal if the sintering of oxygen carrier is minimized at the suitable reactor temperature. (author)

Shen, Laihong; Wu, Jiahua; Gao, Zhengping; Xiao, Jun [Thermoenergy Engineering Research Institute, Southeast University, 2 Sipailou, Nanjing 210096 (China)

2009-07-15T23:59:59.000Z

262

Electron microscopy study of NiW/Al{sub 2}O{sub 3}-F(x) sulfided catalysts prepared using oxisalt and thiosalt precursors  

SciTech Connect (OSTI)

Two different series of sulfided NiW catalysts supported on alumina modified with different amounts of fluoride, in the range 0.0-2.5 wt%, have been prepared by using two different tungsten precursor salts: ammonium metatungstate and ammonium tetrathiotungstate. Samples of both catalyst series have been examined by the use of high-resolution electron microscopy. For the oxisalt-prepared catalysts the results indicate that fluoride incorporation increases the size of WS{sub 2} crystallites but has little effect on the number of layers. On the other hand, the change of precursor salt significantly influences the stacking of WS{sub 2} crystallites without greatly affecting their size. The thiosalt method of preparation also leads to an excess of sulfur in the catalysts, which is distributed in a nonhomogeneous way. 16 refs., 13 figs., 2 tabs.

Ramirez, J.; Castillo, P.; Benitez, A. [Universidad Autonoma de Mexico City (Mexico)] [and others] [Universidad Autonoma de Mexico City (Mexico); and others

1996-01-01T23:59:59.000Z

263

Microstructure, magnetic and electric properties of BaTiO{sub 3}–Ni{sub 0.5}Zn{sub 0.5}Fe{sub 1.5}Cr{sub 0.5}O{sub 4} nanocomposite  

SciTech Connect (OSTI)

Highlights: ? BaTiO{sub 3}/Ni{sub 0.5}Zn{sub 0.5}Fe{sub 1.5}Cr{sub 0.5}O{sub 4} nanocomposites were synthesized by the sol–gel method. ? A large induced strain is induced in the composite. ? The ferroelectric phase transition dependence on the amount of ferrite. - Abstract: xBaTiO{sub 3} + (1 ? x)Ni{sub 0.5}Zn{sub 0.5}Fe{sub 1.5}Cr{sub 0.5}O{sub 4} (x = 0.35, 0.5, 0.65) nanocomposites were synthesized by the sol–gel method. The two corresponding intended nanocomposites phases were confirmed by X-ray diffraction, no other foreign phases were present. The microstrain of the nanocomposite was found to depend on the ratio amount of BaTiO{sub 3} (BTO) in the nanocomposites. The tetragonality ratio c/a of BTO approximates its values to be (a = c) at concentration of 65% BTO. Magnetic properties showed superparamgnetic behavior at room temperature. The temperature dependent of dielectric constant measurements showed that the Curie temperature (T{sub c}) of the ferroelectric phase transition varies with different composites ratio. The dielectric properties of the composite increased with increase of ferrite content. The compressed stress generated by the lattice mismatch of the in planes at the interface of the ferroelectric and magnetic phases cause large strain. The mediation of this strain causes strong electromagnetic coupling creating new materials with good quality.

Mohamed, Mohamed Bakr, E-mail: mbm1977@yahoo.com [Physics Department, Faculty of Science, Ain Shams University, Cairo (Egypt); El-Sayed, Karimat [Physics Department, Faculty of Science, Ain Shams University, Cairo (Egypt)

2013-05-15T23:59:59.000Z

264

ALS Spectrum  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May JunDatastreamsmmcrcalgovInstrumentsrucLasDelivered‰PNGExperience4AJ01) (See95TI07)Operations DuringALS DoctoralALSSpectroscopyALS

265

Photosensitivity of the Ni-A state of [NiFe] hydrogenase from Desulfovibrio vulgaris Miyazaki F with visible light  

SciTech Connect (OSTI)

Highlights: Black-Right-Pointing-Pointer Ni-A state of [NiFe] hydrogenase showed light sensitivity. Black-Right-Pointing-Pointer New FT-IR bands were observed with light irradiation of the Ni-A state. Black-Right-Pointing-Pointer EPR g-values of the Ni-A state shifted upon light irradiation. Black-Right-Pointing-Pointer The light-induced state converted back to the Ni-A state under the dark condition. -- Abstract: [NiFe] hydrogenase catalyzes reversible oxidation of molecular hydrogen. Its active site is constructed of a hetero dinuclear Ni-Fe complex, and the oxidation state of the Ni ion changes according to the redox state of the enzyme. We found that the Ni-A state (an inactive unready, oxidized state) of [NiFe] hydrogenase from Desulfovibrio vulgaris Miyazaki F (DvMF) is light sensitive and forms a new state (Ni-AL) with irradiation of visible light. The Fourier transform infrared (FT-IR) bands at 1956, 2084 and 2094 cm{sup -1} of the Ni-A state shifted to 1971, 2086 and 2098 cm{sup -1} in the Ni-AL state. The g-values of g{sub x} = 2.30, g{sub y} = 2.23 and g{sub z} = 2.01 for the signals in the electron paramagnetic resonance (EPR) spectrum of the Ni-A state at room temperature varied for -0.009, +0.012 and +0.010, respectively, upon light irradiation. The light-induced Ni-AL state converted back immediately to the Ni-A state under dark condition at room temperature. These results show that the coordination structure of the Fe site of the Ni-A state of [NiFe] hydrogenase is perturbed significantly by light irradiation with relatively small coordination change at the Ni site.

Osuka, Hisao [Graduate School of Life Science, University of Hyogo, 3-2-1, Koto, Kamigori-cho, Ako-gun, Hyogo 678-1297 (Japan) [Graduate School of Life Science, University of Hyogo, 3-2-1, Koto, Kamigori-cho, Ako-gun, Hyogo 678-1297 (Japan); Graduate School of Materials Science, Nara Institute of Science and Technology, 8916-5, Takayama-cho, Ikoma-shi, Nara 630-0192 (Japan); Shomura, Yasuhito; Komori, Hirofumi; Shibata, Naoki [Graduate School of Life Science, University of Hyogo, 3-2-1, Koto, Kamigori-cho, Ako-gun, Hyogo 678-1297 (Japan)] [Graduate School of Life Science, University of Hyogo, 3-2-1, Koto, Kamigori-cho, Ako-gun, Hyogo 678-1297 (Japan); Nagao, Satoshi [Graduate School of Materials Science, Nara Institute of Science and Technology, 8916-5, Takayama-cho, Ikoma-shi, Nara 630-0192 (Japan)] [Graduate School of Materials Science, Nara Institute of Science and Technology, 8916-5, Takayama-cho, Ikoma-shi, Nara 630-0192 (Japan); Higuchi, Yoshiki, E-mail: hig@sci.u-hyogo.ac.jp [Graduate School of Life Science, University of Hyogo, 3-2-1, Koto, Kamigori-cho, Ako-gun, Hyogo 678-1297 (Japan) [Graduate School of Life Science, University of Hyogo, 3-2-1, Koto, Kamigori-cho, Ako-gun, Hyogo 678-1297 (Japan); CREST, JST, Gobancho, Chiyoda-ku, Tokyo 102-0076 (Japan); Hirota, Shun, E-mail: hirota@ms.naist.jp [Graduate School of Materials Science, Nara Institute of Science and Technology, 8916-5, Takayama-cho, Ikoma-shi, Nara 630-0192 (Japan) [Graduate School of Materials Science, Nara Institute of Science and Technology, 8916-5, Takayama-cho, Ikoma-shi, Nara 630-0192 (Japan); CREST, JST, Gobancho, Chiyoda-ku, Tokyo 102-0076 (Japan)

2013-01-04T23:59:59.000Z

266

Microstructures and properties of laser-glazed plasma-sprayed ZrO{sub 2}-YO{sub 1.5}/Ni-22Cr-10Al-1Y thermal barrier coatings  

SciTech Connect (OSTI)

Thermal barrier coatings (TBCs) consisting of two layers with various yttria contents (ZrO{sub 2}-YO{sub 1.5}/Ni-22Cr-10Al-1Y) were plasma sprayed, and parts of the various specimens were glazed by using a pulsed CO{sub 2} laser. All the specimens were then subjected to furnace thermal cycling tests at 1,100 C; the effect of laser glazing on the durability and failure mechanism of the TBCs was then evaluated. From these results, two models were developed to show the failure mechanism of as-sprayed and laser-glazed TBCs: model A, which is thermal-stress dominant, and model V, which is oxidation-stress dominant. For top coats containing cubic phase, cubic and monoclinic phases, or tetragonal and a relatively larger amount of monoclinic phases, whose degradation is thermal-stress dominant, laser glazing improved the durability of TBCs by a factor of about 2 to 6. Segmented cracks that occurred during glazing proved beneficial for accommodating thermal stress and raising the tolerance to oxidation, which resulted in a higher durability. Thermal barrier coatings with top coats containing tetragonal phase had the highest durability. Degradation of such TBCs resulted mainly from oxidation of the bond coats. For top coats with a greater amount of monoclinic phase, thermal mismatch stress occurred during cooling and detrimentally affected durability.

Tsai, H.L.; Tsai, P.C. [National Taiwan Inst. of Tech., Taipei (Taiwan, Province of China). Dept. of Mechanical Engineering and Technology

1995-12-01T23:59:59.000Z

267

ALS Spectrum  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May JunDatastreamsmmcrcalgovInstrumentsrucLasDelivered‰PNGExperience4AJ01) (See95TI07)Operations DuringALS DoctoralALSSpectroscopy

268

ALS Spectrum  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May JunDatastreamsmmcrcalgovInstrumentsrucLasDelivered‰PNGExperience4AJ01) (See95TI07)Operations DuringALS

269

E-Print Network 3.0 - alloyed mg50 ni50 Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Ti29.2Ni50.8Hf20 ... Source: Zheng, Yufeng - Department of Advanced Materials and Nanotechnology, Peking University Collection: Materials Science ; Biology and Medicine 2 J. PHYS....

270

Conductance control at the LaAlO{sub 3}/SrTiO{sub 3}-interface by a multiferroic BiFeO{sub 3} ad-layer  

SciTech Connect (OSTI)

Multilayered BiFeO{sub 3} (BFO)/LaAlO{sub 3} (LAO) thin film samples were fabricated on SrTiO{sub 3} (STO) substrates by pulsed laser deposition. In this work, the ferroelectric polarization of a multiferroic BFO ad-layer on top of the quasi-two-dimensional electron gas (2DEG) at the LAO/STO interface is used to manipulate the conductivity of the quasi-2DEG. By microstructuring the conductive area of the LAO/STO-interface, a four-point geometry for the measurement of the resistivity was achieved. Piezo force microscopy allows for imaging and poling the spontaneous ferroelectric polarization of the multiferroic layer. The resistance changes showed a linear dependence on the area scanned and a hysteretic behavior with respect to the voltages applied in the scanning process. This is evidence for the ferroelectric polarization of the multiferroic causing the resistance changes. Coupling the antiferromagnetic BFO layer to another ferromagnetic layer could enable a magnetic field control of the conductance of the quasi-2DEG at the LAO/STO interface.

Mix, Christian; Finizio, Simone; Kläui, Mathias; Jakob, Gerhard [Institut für Physik, Johannes Gutenberg Universität Mainz, Staudingerweg 7, D-55128 Mainz (Germany)

2014-06-30T23:59:59.000Z

271

Mechanism and kinetics of carbide dissolution in near alpha Ti-5.6Al-4.8Sn-2Zr-1Mo-0.35Si-0.7Nd titanium alloy  

SciTech Connect (OSTI)

The present work evaluates the influence of bulk carbon content and aging temperature on the stability of carbide in near alpha Ti-5.6Al-4.8Sn-2Zr-1Mo-0.35Si-0.7Nd titanium alloy. The carbide particles were formed during heat treatment in the {beta} phase field and preserved by water quenching. Subsequent aging treatments at 750-850 Degree-Sign C caused partial dissolution of these precipitates, as a result of the peritectoid reaction between the {beta} phase and carbide. The models based on interface reaction controlled dissolution, via uniform atomic detachment, dislocation mechanism or vacancy flow, yielded experimental predictions comparable to the observed dissolution kinetics. Furnace cooling after heat treatment in the {beta} phase field dissolved carbide particles completely, and the microstructure changed from acicular-like or block {alpha} to equiaxed {alpha} with increase of carbon content. - Highlights: Black-Right-Pointing-Pointer Carbide dissolution occurs at precipitate/matrix interfaces, forming {beta}-depleted zone. Black-Right-Pointing-Pointer Peritectoid reaction is responsible for drastic reduction of carbide volume fraction. Black-Right-Pointing-Pointer Slower dissolution rate is accounted by dislocation, vacancy flow, and curvature. Black-Right-Pointing-Pointer Lamellar changed to equiaxed {alpha} with increasing carbon from {beta} furnace cooling.

Zhang, S.Z., E-mail: szzhangyt@163.com [School of Environmental and Materials Engineering, Yantai University, 32 Qingquan Road, Yantai 264005 (China); Li, M.M. [School of Environmental and Materials Engineering, Yantai University, 32 Qingquan Road, Yantai 264005 (China); Yang, R. [Titanium Alloy Laboratory, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016 (China)

2011-12-15T23:59:59.000Z

272

al embarazo reporte: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

of superelastic CuAlNi single crystal shape memory alloy during stress Sun, Qing-Ping 133 Josephson effect and tunneling spectroscopy in NbAl2O3AlMgB2 thin films junctions...

273

Structure, magnetic properties and magnetoelastic anisotropy in epitaxial Sr(Ti???Co?)O? films  

E-Print Network [OSTI]

We report the structure, magnetic properties and magnetoelastic anisotropy of epitaxial Sr(Ti???Co?)O? films grown on LaAlO? (001) and SrTiO? (001) substrates by pulsed laser deposition. Room temperature ferromagnetism was ...

Bi, Lei

274

al zn alloy: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

NANOLAMINATES . Open Access Theses and Dissertations Summary: ??To characterize the self-propagating, high-temperature exothermic alloying reactions of NiAl nanoscaled...

275

Dirac cones in artificial structures of 3d transitional-metals doped Mg-Al spinels  

SciTech Connect (OSTI)

Motivated by recent theoretical predications for Dirac cone in two-dimensional (2D) triangular lattice [H. Ishizuka, Phys. Rev. Lett. 109, 237207 (2012)], first-principles studies are performed to predict Dirac cones in artificial structures of 3d transitional-metals (TM?=?Ti, V, Cr, Mn, Fe, Co, Ni, and Cu) doped Mg-Al spinels. In investigated artificial structures, TM dopants substitute specific positions of the B sub-lattice in Mg-Al spinel, and form a quasi-2D triangular lattice in the a-b plane. Calculated results illustrate the existence of the spin-polarized Dirac cones formed in d-wave bands at (around) the K-point in the momentum space. The study provides a promising route for engineering Dirac physics in condensed matters.

Lu, Yuan; Zuo, Xu, E-mail: xzuo@nankai.edu.cn [College of Electronic Information and Optical Engineering, Nankai University, Tianjin 300071 (China); Feng, Min [School of Physics, Nankai University, Tianjin 300071 (China); Shao, Bin [Department of Physics, Tsinghua University, Beijing 100084 (China)

2014-05-07T23:59:59.000Z

276

Growth of Epitaxial gamma-Al2O3 Films on Rigid Single-Crystal Ceramic Substrates and Flexible, Single-Crystal-Like Metallic Substrates by Pulsed Laser Deposition  

SciTech Connect (OSTI)

Epitaxial -Al2O3 thin films were grown on diverse substrates using pulsed laser deposition. The high quality of epitaxial growth and cubic structure of -Al2O3 films was confirmed by x-ray diffraction. SrTiO3 and MgO single crystal substrates were used to optimize the growth conditions for epitaxial -Al2O3 film. Under the optimized conditions, epitaxial -Al2O3 thin films were grown on flexible, single-crystal-like, metallic templates. These included untextured Hastelloy substrates with a biaxially textured MgO layer deposited using ion-beam-assisted-deposition and biaxially textured Ni-W metallic tapes with epitaxially grown and a biaxially textured, MgO buffer layer. These biaxially textured, -Al2O3 films on flexible, single-crystal-like substrates are promising for subsequent epitaxial growth of various complex oxide films used for electrical, magnetic and electronic device applications.

Shin, Junsoo [ORNL; Goyal, Amit [ORNL; Wee, Sung Hun [ORNL

2009-01-01T23:59:59.000Z

277

A=16Al (1993TI07)  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

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278

Exploration of R2XM2 (R=Sc, Y, Ti, Zr, Hf, rare earth; X=main group element; M=transition metal, Si, Ge): Structural Motifs, the novel Compound Gd2AlGe2 and Analysis of the U3Si2 and Zr3Al2 Structure Types  

SciTech Connect (OSTI)

In the process of exploring and understanding the influence of crystal structure on the system of compounds with the composition Gd{sub 5}(Si{sub x}Ge{sub 1-x}){sub 4} several new compounds were synthesized with different crystal structures, but similar structural features. In Gd{sub 5}(Si{sub x}Ge{sub 1-x}){sub 4}, the main feature of interest is the magnetocaloric effect (MCE), which allows the material to be useful in magnetic refrigeration applications. The MCE is based on the magnetic interactions of the Gd atoms in the crystal structure, which varies with x (the amount of Si in the compound). The crystal structure of Gd{sub 5}(Si{sub x}Ge{sub 1-x}){sub 4} can be thought of as being formed from two 3{sup 2}434 nets of Gd atoms, with additional Gd atoms in the cubic voids and Si/Ge atoms in the trigonal prismatic voids. Attempts were made to substitute nonmagnetic atoms for magnetic Gd using In, Mg and Al. Gd{sub 2}MgGe{sub 2} and Gd{sub 2}InGe{sub 2} both possess the same 3{sup 2}434 nets of Gd atoms as Gd{sub 5}(Si{sub x}Ge{sub 1-x}){sub 4}, but these nets are connected differently, forming the Mo{sub 2}FeB{sub 2} crystal structure. A search of the literature revealed that compounds with the composition R{sub 2}XM{sub 2} (R=Sc, Y, Ti, Zr, Hf, rare earth; X=main group element; M=transition metal, Si, Ge) crystallize in one of four crystal structures: the Mo{sub 2}FeB{sub 2}, Zr{sub 3}Al{sub 2}, Mn{sub 2}AlB{sub 2} and W{sub 2}CoB{sub 2} crystal structures. These crystal structures are described, and the relationships between them are highlighted. Gd{sub 2}AlGe{sub 2} forms an entirely new crystal structure, and the details of its synthesis and characterization are given. Electronic structure calculations are performed to understand the nature of bonding in this compound and how electrons can be accounted for. A series of electronic structure calculations were performed on models with the U{sub 3}Si{sub 2} and Zr{sub 3}Al{sub 2} structures, using Zr and A1 as the building blocks. The starting point for these models was the U{sub 3}Si{sub 2} structure, and models were created to simulate the transition from the idealized U{sub 3}Si{sub 2} structure to the distorted Zr{sub 3}Al{sub 2} structure. Analysis of the band structures of the models has shown that the transition from the U{sub 3}Si{sub 2} structure to the Zr{sub 3}Al{sub 2} structure lifts degeneracies along the {Lambda} {yields} Z direction, indicating a Peierls-type mechanism for the displacement occurring in the positions of the Zr atoms.

Sean William McWhorter

2006-05-01T23:59:59.000Z

279

Monopole Strength in Ni-58  

E-Print Network [OSTI]

PHYSICAL REVIEW C VOLUME 44, NUMBER 5 Monopole strength in Ni NOVEMBER 1991 D. H. Youngblood and Y.-W. Lui Cyclotron Institute, Texas AdkM Uni Uersi ty, College Station, Texas 77843 (Received 20 June 1991) Differential cross-section data from... strength is locat- ed nearer the quadrupole (for Ca [3] and Si [4] at vir- tually the same energy). Only two reports of substantial strength in lighter nuclei are in the literature. Lui et al. [4] reported 66%%uo of the EO energy-weighted sum rule...

Youngblood, David H.; Lui, YW.

1991-01-01T23:59:59.000Z

280

Salicidation process using NiSi and its device application R. A. Johnson, P. M. Asbeck, and S. S. Lau  

E-Print Network [OSTI]

temperature window. In this article, the formation of nickel mono-silicide NiSi using rapid thermal annealing. In the recent past, there have been concerns related to the in- crease of TiSi2 film resistivity on submicron resistivity C54 phase.5,6 The TiSi2 process- ing temperature window is relatively narrow due to the high

Asbeck, Peter M.

Note: This page contains sample records for the topic "ni ti al" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


281

NiW and NiRu Bimetallic Catalysts for Ethylene Steam Reforming: Alternative Mechanisms for Sulfur Resistance  

SciTech Connect (OSTI)

Previous investigations of Ni-based catalysts for the steam reforming of hydrocarbons have indicated that the addition of a second metal can reduce the effects of sulfur poisoning. Two systems that have previously shown promise for such applications, NiW and NiRu, are considered here for the steam reforming of ethylene, a key component of biomass derived tars. Monometallic and bimetallic Al{sub 2}O{sub 3}-supported Ni and W catalysts were employed for ethylene steam reforming in the presence and absence of sulfur. The NiW catalysts were less active than Ni in the absence of sulfur, but were more active in the presence of 50 ppm H{sub 2}S. The mechanism for the W-induced improvements in sulfur resistance appears to be different from that for Ru in NiRu. To probe reasons for the sulfur resistance of NiRu, the adsorption of S and C{sub 2}H{sub 4} on several bimetallic NiRu alloy surfaces ranging from 11 to 33 % Ru was studied using density functional theory (DFT). The DFT studies reveal that sulfur adsorption is generally favored on hollow sites containing Ru. Ethylene preferentially adsorbs atop the Ru atom in all the NiRu (111) alloys investigated. By comparing trends across the various bimetallic models considered, sulfur adsorption was observed to be correlated with the density of occupied states near the Fermi level while C{sub 2}H{sub 4} adsorption was correlated with the number of unoccupied states in the d-band. The diverging mechanisms for S and C{sub 2}H{sub 4} adsorption allow for bimetallic surfaces such as NiRu that enhance ethylene binding without accompanying increases in sulfur binding energy. In contrast, bimetallics such as NiSn and NiW appear to decrease the affinity of the surface for both the reagent and the poison.

Rangan, M.; Yung, M. M.; Medlin, J. W.

2012-06-01T23:59:59.000Z

282

Instability, intermixing and electronic structure at theepitaxialLaAl...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

intermixing and electronic structure at the epitaxialLaAlO3SrTiO3(001) heterojunction. Instability, intermixing and electronic structure at the epitaxialLaAlO3...

283

Conversion of CH{sub 4}/CO{sub 2} to syngas over Ni-Co/Al{sub 2}O{sub 3}-ZrO{sub 2} nanocatalyst synthesized via plasma assisted co-impregnation method: Surface properties and catalytic performance  

SciTech Connect (OSTI)

Ni/Al{sub 2}O{sub 3} catalyst promoted by Co and ZrO{sub 2} was prepared by co-impregnation method and treated with glow discharge plasma. The catalytic activity of the synthesized nanocatalysts has been tested toward conversion of CH{sub 4}/CO{sub 2} to syngas. The physicochemical characterizations like XRD, EDX, FESEM, TEM, BET, FTIR, and XPS show that plasma treatment results in smaller particle size, more surface concentration, and uniform morphology. The dispersion of nickel in plasma-treated nanocatalyst was also significantly improved, which was helpful for controlling the ensemble size of active phase atoms on the support surface. Improved physicochemical properties caused 20%–30% enhancement in activity of plasma-treated nanocatalyst that means to achieve the same H{sub 2} or CO yield, the plasma-treated nanocatalyst needed about 100 °C lower reaction temperature. The H{sub 2}/CO ratio got closer to 1 at higher temperatures and finally at 850 °C H{sub 2}/CO = 1 is attained for plasma-treated nanocatalyst. Plasma-treated nanocatalyst due to smaller Ni particles and strong interaction between active phase and support has lower tendency to keep carbon species on its structure and hence excellent stability can be observed for this catalyst.

Rahemi, Nader; Haghighi, Mohammad [Chemical Engineering Faculty, Sahand University of Technology, P.O. Box 51335-1996, Sahand New Town, Tabriz (Iran, Islamic Republic of) [Chemical Engineering Faculty, Sahand University of Technology, P.O. Box 51335-1996, Sahand New Town, Tabriz (Iran, Islamic Republic of); Reactor and Catalysis Research Center (RCRC), Sahand University of Technology, P.O. Box 51335-1996, Sahand New Town, Tabriz (Iran, Islamic Republic of); Akbar Babaluo, Ali [Chemical Engineering Faculty, Sahand University of Technology, P.O. Box 51335-1996, Sahand New Town, Tabriz (Iran, Islamic Republic of) [Chemical Engineering Faculty, Sahand University of Technology, P.O. Box 51335-1996, Sahand New Town, Tabriz (Iran, Islamic Republic of); Nanostructure Material Research Center (NMRC), Sahand University of Technology, P.O. Box 51335-1996, Sahand New Town, Tabriz (Iran, Islamic Republic of); Fallah Jafari, Mahdi [National Iranian Oil Refining and Distribution Company (NIORDC), National Iranian Oil Company (NIOC), P.O. Box 15815-3499, Tehran (Iran, Islamic Republic of)] [National Iranian Oil Refining and Distribution Company (NIORDC), National Iranian Oil Company (NIOC), P.O. Box 15815-3499, Tehran (Iran, Islamic Republic of); Khorram, Sirous [Research Institute for Applied Physics and Astronomy (RIAPA), University of Tabriz, P.O. Box: 51665-163, Tabriz (Iran, Islamic Republic of)] [Research Institute for Applied Physics and Astronomy (RIAPA), University of Tabriz, P.O. Box: 51665-163, Tabriz (Iran, Islamic Republic of)

2013-09-07T23:59:59.000Z

284

A new class of materials with promising thermoelectric properties: MNiSn (M=Ti, Zr, Hf)  

SciTech Connect (OSTI)

TiNiSn, ZrNiSn and HfNiSn are members of a large group of intermetallic compounds which crystallize in the cubic MgAgAs-type structure. Polycrystalline samples of these compounds have been prepared and investigated for their thermoelectric properties. With thermopowers of about {minus}200 {micro}V/K and resistivities of a few m{Omega}cm, power factors S{sup 2}/{rho} as high as 38 {micro}W/K{sup 2}cm were obtained at 700 K. These remarkably high power factors are, however, accompanied by a thermal conductivity, solid solutions Zr{sub 1{minus}x}Hf{sub x}NiSn, Zr{sub 1{minus}x}Ti{sub x}NiSn, and Hf{prime}{sub 1{minus}x}Ti{sub x}NiSn were formed. The figure of merit of Zr{sub 0.5}Hf{sub 0.5}NiSn at 700 K (ZT = 0.41) exceeds the end members ZrNiSn (ZT = 0.26) and HfNiSn (ZT = 0.22).

Hohl, H.; Ramirez, A.P.; Kaefer, W.; Fess, K.; Thurner, Ch.; Kloc, Ch.; Bucher, E.

1997-07-01T23:59:59.000Z

285

Aliovalent titanium substitution in layered mixed Li Ni-Mn-Co oxides for lithium battery applications  

SciTech Connect (OSTI)

Improved electrochemical characteristics are observed for Li[Ni1/3Co1/3-yMyMn1/3]O2 cathode materials when M=Ti and y<0.07, compared to the baseline material, with up to 15percent increased discharge capacity.

Kam, Kinson; Doeff, Marca M.

2010-12-01T23:59:59.000Z

286

Ni Ni: University of California - Los Angeles  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

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287

Melt Processed Single Phase Hollandite Waste Forms For Nuclear Waste Immobilization: Ba{sub 1.0}Cs{sub 0.3}A{sub 2.3}Ti{sub 5.7}O{sub 16}; A = Cr, Fe, Al  

SciTech Connect (OSTI)

Cs is one of the more problematic fission product radionuclides to immobilize due to its high volatility at elevated temperatures, ability to form water soluble compounds, and its mobility in many host materials. The hollandite structure is a promising crystalline host for Cs immobilization and has been traditionally fabricated by solid state sintering methods. This study presents the structure and performance of Ba{sub 1.0}Cs{sub 0.3}A{sub 2.3}Ti{sub 5.7}O{sub 16}; A = Cr, Fe, Al hollandite fabricated by melt processing. Melt processing is considered advantageous given that melters are currently in use for High Level Waste (HLW) vitrification in several countries. This work details the impact of Cr additions that were demonstrated to i) promote the formation of a Cs containing hollandite phase and ii) maintain the stability of the hollandite phase in reducing conditions anticipated for multiphase waste form processing.

Brinkman, Kyle [Savannah River National Laboratory, Aiken, SC 29808 (United States); Marra, James [Savannah River National Laboratory, Aiken, SC 29808 (United States); Amoroso, Jake [Savannah River National Laboratory, Aiken, SC 29808 (United States); Conradson, Steven D. [Los Alamos National Laboratory, Los Alamos, NM 87545 (United States); Tang, Ming [Los Alamos National Laboratory, Los Alamos, NM 87545 (United States)

2013-09-23T23:59:59.000Z

288

Characterization of diffusion bonded joint between titanium and 304 stainless steel using a Ni interlayer  

SciTech Connect (OSTI)

Solid-state diffusion bonded joints were prepared between commercially pure titanium and 304 stainless steel with nickel as an intermediate material in the temperature range of 800-950 deg. C for 10.8 ks under a 3 MPa uniaxial pressure in vacuum. The interface microstructures and reaction products of the transition joints were investigated by optical and scanning electron microscopy. Up to 850 deg. C processing temperature, a 300-{mu}m nickel interlayer completely restricts the diffusion of titanium to stainless steel. However, the nickel interlayer cannot block the diffusion of Ti to the stainless side and {lambda} + {chi} + {alpha}-Fe, {lambda} + FeTi and {lambda} + FeTi + {beta}-Ti phase mixtures are formed at the SS-Ni interface, when bonding was processed at 900 deg. C and above. These reaction products were confirmed by X-ray diffraction. A maximum tensile strength of {approx} 270 MPa and shear strength of {approx} 194 MPa, along with 6.2% ductility, were obtained for the diffusion bonded joint processed at 850 deg. C. Fracture surface observation in SEM using EDS demonstrates that failure occurred through the Ni-Ti interface of the joints when processed up to 850 deg. C and through the SS-Ni interface when processed at and above 900 deg. C.

Kundu, S. [Department of Metallurgy and Materials Engineering, Bengal Engineering and Science University, Shibpur, Howrah - 711103 (India)], E-mail: erskundu@yahoo.com; Chatterjee, S. [Department of Metallurgy and Materials Engineering, Bengal Engineering and Science University, Shibpur, Howrah - 711103 (India)], E-mail: schatterjee46@yahoo.com

2008-05-15T23:59:59.000Z

289

ALS Beamlines Directory  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

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290

ALS Beamlines Directory  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

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291

ALS Chemistry Lab  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

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292

ALS Chemistry Lab  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May JunDatastreamsmmcrcalgovInstrumentsrucLasDelivered‰PNGExperience4AJ01) (See95TI07)Operations During theALSSafety Safety for Users ALS

293

E-Print Network 3.0 - alloy ni-mn-ga single Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Mathematics 35 Lattice dynamics and phonon softening in Ni-Mn-Al Heusler alloys Xavier Moya, Llus Maosa,* and Antoni Planes Summary: as 10% have been re- ported in single...

294

Bulk Migration of Ni/NiO in Ni-YSZ during Reducing Conditions  

SciTech Connect (OSTI)

Understanding the migration of Ni/NiO in Ni-YSZ can potentially help to design a better solid oxide fuel cell (SOFC) anode. We have observed that extensive hydrogen reduction and methane steam reforming of Ni-YSZ caused bulk migration of Ni/NiO to at least ~ 5 µm deeper from the Ni-YSZ surface. No significant bulk migration effects were detected after simple thermal treatments in non-reducing/non-reforming environment. Surface analysis of a single zirconia grain in the first 10-20 nm region from annealed, hydrogen reduced and methane steam reformed Ni-YSZ shows Ni-enriched surface supporting earlier claims of Ni exsolution. 3D-EBSD analysis of thermally treated sample before exposing it to reducing and reforming environment indicated mixed NiO/YSZ phase with some porosity and random grain orientation. The surface analysis and mapping were carried out using ToF-SIMS and AES whereas EDS maps on FIB sliced areas on Ni-YSZ were utilized for the bulk analysis. The results provide additional information related to complex reactions occurring in SOFC during internal reforming conditions.

Saraf, Laxmikant V.; Baer, Donald R.; Lea, Alan S.; Zhu, Zihua; Strohm, James J.; Sitzman, S. D.; King, David L.

2010-02-09T23:59:59.000Z

295

Darlington AL O'Reillys AL  

E-Print Network [OSTI]

CanungraCk Darlington AL Darlington Coom era R O'Reillys AL Beechmont AL Binna Burra AL BackCk Tyungun AL Numinbah Valley AL NerangR Natural Bridge Numinbah AL Little Nerang Dam AL Albert R Bromfleet AL Benobble AL Wolffdene AL Luscombe AL Wongawallan AL Mt Tamborine Canungra Pimpama R Laheys Lookout

Greenslade, Diana

296

Amorphous Al-transition Metal Alloys as Anode Material for Lithium Ion Battery  

E-Print Network [OSTI]

Al based alloy powders (Al??Ni?Y?Co?Fe?) are produced by spray atomization method. High energy ball milling is done to modify the surface topology and particle size for better electrochemical performance. X ray diffraction ...

Wang, C.Y.

297

High Nb, Ta, and Al creep- and oxidation-resistant austenitic stainless steel  

DOE Patents [OSTI]

An austenitic stainless steel HTUPS alloy includes, in weight percent: 15 to 30 Ni; 10 to 15 Cr; 2 to 5 Al; 0.6 to 5 total of at least one of Nb and Ta; no more than 0.3 of combined Ti+V; up to 3 Mo; up to 3 Co; up to 1 W; up to 0.5 Cu; up to 4 Mn; up to 1 Si; 0.05 to 0.15 C; up to 0.15 B; up to 0.05 P; up to 1 total of at least one of Y, La, Ce, Hf, and Zr; less than 0.05 N; and base Fe, wherein the weight percent Fe is greater than the weight percent Ni wherein said alloy forms an external continuous scale comprising alumina, nanometer scale sized particles distributed throughout the microstructure, said particles comprising at least one composition selected from the group consisting of NbC and TaC, and a stable essentially single phase fcc austenitic matrix microstructure, said austenitic matrix being essentially delta-ferrite-free and essentially BCC-phase-free.

Brady, Michael P (Oak Ridge, TN) [Oak Ridge, TN; Santella, Michael L (Knoxville, TN) [Knoxville, TN; Yamamoto, Yukinori (Oak Ridge, TN) [Oak Ridge, TN; Liu, Chain-tsuan (Oak Ridge, TN) [Oak Ridge, TN

2010-07-13T23:59:59.000Z

298

Dopant location identification in Nd3+ -doped TiO2 nanoparticles  

E-Print Network [OSTI]

Dopant location identification in Nd3+ -doped TiO2 nanoparticles W. Li Department of Materials. The identification of dopant position and its local environ- ment are essential to explore the effect of doping. X and Technology, Gaithersburg, Maryland 20899, USA C. Ni Department of Materials Science and Engineering

Frenkel, Anatoly

299

Effect of Composition on the Solidification Behavior of Several Ni-Cr-Mo and Fe-Ni-Cr-Mo Alloys  

E-Print Network [OSTI]

simulate the solidifi- cation behavior of dissimilar welds made between AL-6XN and Ni-base filler metals.[3 differential thermal analysis (DTA) samples and welded specimens. This explains the in- variance of the amount of eutectic constituent observed in the microstructure in the welded and DTA conditions. Multicomponent

DuPont, John N.

300

E-Print Network 3.0 - al si ca Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Summary: and Gibbs 1976). 12;KROEKER ET AL.: OXYGEN-17 NMR OF GLASSY AND CRYSTALLINE TITANITE 575 CaTiSiO5 glass... ; Lee and Stebbins 2000; Zhao et al. 2000). The spectra for...

Note: This page contains sample records for the topic "ni ti al" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


301

Developing TiAIN Coatings for Intermediate Temperature-Solid Oxide Fuel Cell Interconnect Applications  

SciTech Connect (OSTI)

TiN-type coatings have potential to be used as SOFC interconnect coatings SOFC because of their low resistance and high temperature stability. In this research, various (Ti,Al)N coatings were deposited on stainless steels by filtered-arc method. ASR and XRD tests were conducted on these coatings, and SEM/EDAX analysis were conducted after ASR and XRD tests. SEM/EDAX analyses show that (Ti,Al)N remains stable at temperature up to 700°C. It is also indicated that Al has beneficial effect on the stability of TiN type coatings. At 900°C, (Ti-30Al)N is fully oxidized and some of (Ti-50Al)N coating still remains as nitride. The analyses on cross-sectional samples show that these coatings are effective barrier to the Cr migration. In summary, (Ti.Al)N coatings are good candidates for the SOFC interconnect applications at 700°C. The future directions of this research are to improve the stability of these coatings by alloy-doping and to develop multi-layer coatings.

Liu, X. (West Virginia University); Johnson, C.D.; Li, C. (West Virginia University); Xu, J. (West Virginia University); Cross, C.

2007-02-01T23:59:59.000Z

302

High-rate and low-temperature synthesis of TiO2, TiN, and TiO2/TiN/TiO2 thin films and study of their optical and interfacial characteristics  

E-Print Network [OSTI]

High-rate and low-temperature synthesis of TiO2, TiN, and TiO2/TiN/TiO2 thin films and study with unbalanced magnetrons, we deposited advanced inorganic functional thin films such as TiO2, TiN, and TiO2/Ti sputtering. The TiO2 101 and TiN 100 thin films were stoichiometric and polycrystalline but highly oriented

Boo, Jin-Hyo

303

Simulations of Plug-in Hybrid Vehicles Using Advanced Lithium Batteries and Ultracapacitors on Various Driving Cycles  

E-Print Network [OSTI]

NiCoAl Graphite/ NiCoMnO2 Graphite/Iron Phosph. LiTiO/NiMnO2 LiTiO/ NiMnO2 Graphite/ NiCo Graphite/ NiCo Graphite/

Burke, Andy; Zhao, Hengbing

2010-01-01T23:59:59.000Z

304

Experimental determination of band offsets of NiO-based thin film heterojunctions  

SciTech Connect (OSTI)

The energy band diagrams of NiO-based solar cell structures that use various n-type oxide semiconductors such as ZnO, Mg{sub 0.3}Zn{sub 0.7}O, Zn{sub 0.5}Sn{sub 0.5}O, In{sub 2}O{sub 3}:Sn (ITO), SnO{sub 2}, and TiO{sub 2} were evaluated by photoelectron yield spectroscopy. The valence band discontinuities were estimated to be 1.6?eV for ZnO/NiO and Mg{sub 0.3}Zn{sub 0.7}O/NiO, 1.7?eV for Zn{sub 0.5}Sn{sub 0.5}O/NiO and ITO/NiO, and 1.8?eV for SnO{sub 2}/NiO and TiO{sub 2}/NiO heterojunctions. By using the valence band discontinuity values and corresponding energy bandgaps of the layers, energy band diagrams were developed. Judging from the band diagram, an appropriate solar cell consisting of p-type NiO and n-type ZnO layers was deposited on ITO, and a slight but noticeable photovoltaic effect was obtained with an open circuit voltage (V{sub oc}) of 0.96?V, short circuit current density (J{sub sc}) of 2.2??A/cm{sup 2}, and fill factor of 0.44.

Kawade, Daisuke; Sugiyama, Mutsumi, E-mail: mutsumi@rs.noda.tus.ac.jp [Faculty of Science and Technology/Research Institute for Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda 278-8510 (Japan); Chichibu, Shigefusa F. [Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba, Sendai 980–8577 (Japan)

2014-10-28T23:59:59.000Z

305

ALS Evidence Confirms Combustion Theory  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

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306

ALS Scientific Advisory Committee Charter  

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307

ALS Scientific Advisory Committee Charter  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May JunDatastreamsmmcrcalgovInstrumentsrucLasDelivered‰PNGExperience4AJ01) (See95TI07)Operations DuringALS DoctoralALS RevealsScientific

308

ALS Scientific Advisory Committee Charter  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May JunDatastreamsmmcrcalgovInstrumentsrucLasDelivered‰PNGExperience4AJ01) (See95TI07)Operations DuringALS DoctoralALS

309

A Low Noise NbTiN-based 850 GHz SIS Receiver for the  

E-Print Network [OSTI]

the 350 micron atmospheric window. This frequency band lies entirely above the energy gap of niobium (700 that consists of two Nb/AlN/NbTiN tunnel junctions, NbTiN thin-film microstrip tuning elements, and a Nb window was deployed at the CSO. It used a novel 1 µm thick Silicon Nitride membrane which support an all

310

Characterizations of a CERN NbTi Reference Wire at LBNL  

E-Print Network [OSTI]

et al. , report number LBNL-62392 Characterizations of aNbTi Reference Wire at LBNL ? A. Godeke † D. R. Dietderich,tests – and analysis – between LBNL, BNL and Fermilab within

Godeke, A.; Dietderich, D.R.; Higley, H.C.; Liggins, N.L.

2007-01-01T23:59:59.000Z

311

ALD Produced B{sub 2}O{sub 3}, Al{sub 2}O{sub 3} and TiO{sub 2} Coatings on Gd{sub 2}O{sub 3} Burnable Poison Nanoparticles and Carbonaceous TRISO Coating Layers  

SciTech Connect (OSTI)

This project will demonstrate the feasibility of using atomic layer deposition (ALD) to apply ultrathin neutron-absorbing, corrosion-resistant layers consisting of ceramics, metals, or combinations thereof, on particles for enhanced nuclear fuel pellets. Current pellet coating technology utilizes chemical vapor deposition (CVD) in a fluidized bed reactor to deposit thick, porous layers of C (or PyC) and SiC. These graphitic/carbide materials degrade over time owing to fission product bombardment, active oxidation, thermal management issues, and long-term irradiation effects. ALD can be used to deposit potential ceramic barrier materials of interest, including ZrO{sub 2}, Y{sub 2}O{sub 3}:ZrO{sub 2} (YSZ), Al{sub 2}O{sub 3}, and TiO{sub 2}, or neutron-absorbing materials, namely B (in BN or B{sub 2}O{sub 3}) and Gd (in Gd{sub 2}O{sub 3}). This project consists of a two-pronged approach to integrate ALD into the next-generation nuclear plant (NGNP) fuel pellet manufacturing process:

Alan Weimer

2012-11-26T23:59:59.000Z

312

Ti (II) Mediated Reactions in Organic Chemistry  

E-Print Network [OSTI]

' #12;Generation of Ti(II) from Ti(IV) · Bercaw accessed and characterized the first Ti'X -X Generation of Ti(II) via Reductive Alkylation · Ti(IV) converted to Ti(II) via reductive/Acetylene Functionalizations · Reductive Couplings #12;Advantages of Titanium · Titanium (IV) reagents are cheap and readily

Johnson, Jeff S.

313

Bimetallic Ni-Rh catalysts with low amounts of Rh for the steam and autothermal reforming of n-butane for fuel-cell applications.  

SciTech Connect (OSTI)

Mono-metallic nickel and rhodium catalysts and bimetallic Ni-Rh catalysts supported on La-Al{sub 2}O{sub 3}, CeZrO{sub 2} and CeMgOx were prepared and evaluated for catalyzing the steam and autothermal reforming of n-butane. The binary Ni-Rh supported on La-Al{sub 2}O{sub 3} catalysts with low weight loading of rhodium exhibited higher H{sub 2} yields than Ni or Rh alone. The Ni-Rh/CeZrO{sub 2} catalyst exhibited higher performance and no coke formation, compared to the same metals on other supports. A NiAl{sub 2}O{sub 4} spinel phase was obtained on all Ni and Ni-Rh catalysts supported on La-Al{sub 2}O{sub 3}. The presence of rhodium stabilized the spinel phase as well as NiOx species upon reforming while Ni alone was mostly reduced into metallic species. Extended X-ray absorption fine-structure analysis showed evidence of Ni-Rh alloy during preparation and even further after an accelerated aging at 900C in a H{sub 2}/H{sub 2}O atmosphere.

Ferrandon, M.; Kropf, A. J.; Krause, T.; Chemical Sciences and Engineering Division

2010-05-15T23:59:59.000Z

314

ALS Visitors  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

including Ethan Crumlin (at right) about current research in energy storage and battery efficiency. Berkeleyside Editor Lance Knoble toured the ALS and Berkeley Lab with...

315

Giant resonances in Ti-46,Ti-48  

E-Print Network [OSTI]

PHYSICAL REVIEW C 74, 044308 (2006) Giant resonances in 46,48Ti Y. Tokimoto, Y.-W. Lui, H. L. Clark, B. John,* X. Chen, and D. H. Youngblood Cyclotron Institute, Texas A&M University, College Station, Texas 77843, USA (Received 30 June 2006... parameter sets using electro- magnetic B(E2) values [14] and collective model transition potentials successfully reproduced the angular distributions of 0556-2813/2006/74(4)/044308(9) 044308-1 ?2006 The American Physical Society TOKIMOTO, LUI, CLARK, JOHN...

Tokimoto, Y.; Lui, Y. -W; Clark, H. L.; John, B.; Chen, X.; Youngblood, David H.

2006-01-01T23:59:59.000Z

316

Rumpling phenomenon in platinum modified Ni-Al alloys  

SciTech Connect (OSTI)

Surface undulations known as rumpling have been shown to develop at the surface of bond coats used in advanced thermal barrier coating systems. Rumpling can result in cracking and eventual spallation of the top coat. Many mechanisms to explain rumpling have been proposed, and among them is a martensitic transformation. High-temperature x-ray diffraction, differential scanning calorimetry and potentiometry were used to investigate the nature of the martensitic transformation in bulk platinum-modified nickel aluminides. It was found that the martensitic transformation has strong time dependence and can form over a range of temperatures. Cyclic oxidation experiments were performed on the bulk alloys to investigate the effect of the martensitic transformation on surface rumpling. It was found that the occurrence of rumpling was associated with the martensitic transformation. The degree of rumpling was found to increase with an increasing number of cycles and was independent of the heating and cooling rates used. The thickness of the oxide layer at the surface of the samples had a significant impact on the amplitude of the resulting undulations, with amplitude increasing with increasing oxide-layer thickness. Rumpling was also observed in an alloy based on the {gamma}-{gamma}' region of the nickel-aluminum-platinum phase diagram. Rumpling in this alloy was found to occur during isothermal oxidation and is associated with a subsurface layer containing a platinum-rich phase known as a. Rumpling in both alloy systems may be explained by creep deformation of a weakened subsurface layer in response to the compressive stresses in the thermally grown oxide layer.

Zimmerman, Benjamin Joseph

2005-05-01T23:59:59.000Z

317

Transition metal atoms pathways on rutile TiO{sub 2} (110) surface: Distribution of Ti{sup 3+} states and evidence of enhanced peripheral charge accumulation  

SciTech Connect (OSTI)

Charge transfer between metal nanoparticles and the supported TiO{sub 2} surface is primarily important for catalytic applications as it greatly affects the catalytic activity and the thermal stability of the deposited nanoparticles on the surface. Herein, systematic spin-polarized density functional and HSE06 calculations are performed to evaluate the adsorption, diffusion, and charge state of several transition metal monomers on both stoichiometric and reduced rutile TiO{sub 2} (110) surface. Although the presence of oxygen vacancy (O{sub v}) increases the binding of Au, Pt and Pd on the surface, it weakens the interaction thus enhancing the diffusion for Fe, Co, Ni, Ag, and Cu adatoms on the surface. For pristine reduced surface, only a small portion (around 5%) of the excess electrons occupy the topmost surface, which are mainly delocalized at the second nearest and third nearest fivefold coordinated Ti (Ti{sub 5c}) atoms. Excess electrons populating at the Ti{sub 5c} atoms on the basal plane can be transferred to strongly electronegative adsorbates like Au and Pt thus enabling a moderate adsorption at this site, whereas no stable adsorption is found for other less electronegative transition metal adatoms (Ag, Cu, Fe, Co, Ni, and Pd) on the reduced surface and for all the adatoms on stoichiometric surface. This result clarifies the origin of the experimental observation of the adsorption of O{sub 2} and CO molecules at Ti{sub 5c} sites in connection with charge transfer. In addition, the spatial redistribution of the excess electrons around the O{sub v} upon the adsorption of the monomers is thoroughly examined. Our finding of an accumulation of excess electrons at the Ti{sub 5c} sites around the monomers explains the critical role of the perimeter interface of the deposited nanoparticles in promoting the adsorption and activation of reactants observed in experiments.

Cai Yongqing; Bai Zhaoqiang; Chintalapati, Sandhya; Feng Yuanping [Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542 (Singapore); Zeng Qingfeng [School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072 (China)

2013-04-21T23:59:59.000Z

318

Electrically induced insulator to metal transition in epitaxial SmNiO{sub 3} thin films  

SciTech Connect (OSTI)

We report on the electrically induced insulator to metal transition (IMT) in SmNiO{sub 3} thin films grown on (001) LaAlO{sub 3} by pulsed laser deposition. The behavior of the resistivity as a function of temperature suggests that the primary transport mechanism in the SmNiO{sub 3} insulating state is dominated by Efros-Shklovskii variable range hopping (ES-VRH). Additionally, the magnetic transition in the insulating state of SmNiO{sub 3} modifies the characteristics of the ES-VRH transport. Systematic DC and pulsed current-voltage measurements indicate that current-induced joule heating is the fundamental mechanism driving the electrically induced IMT in SmNiO{sub 3}. These transport properties are explained in context of the IMT in SmNiO{sub 3} being related to the strong electron-lattice coupling.

Shukla, Nikhil, E-mail: nss152@psu.edu; Dasgupta, Sandeepan; Datta, Suman [Department of Electrical Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802 (United States); Joshi, Toyanath; Borisov, Pavel; Lederman, David [Department of Physics and Astronomy, West Virginia University, Morgantown, West Virginia 26506-6315 (United States)

2014-07-07T23:59:59.000Z

319

ALS Spectrum  

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320

Proceedings of NAMRI/SME, Vol. 39, 2011 Strength and Microstructure of Laser Fusion Welded Ti-SS  

E-Print Network [OSTI]

welding to diffusion bonding including metal-metal, metal- ceramic, and metal-polymer joints [1 such as stainless steel and titanium, as well as shape memory materials such as NiTi. Many material pairs, however. This study investigates the microstructures and strength of the laser fusion welded titanium-stainless steel

Yao, Y. Lawrence

Note: This page contains sample records for the topic "ni ti al" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


321

Anode-supported thin-film fuel cells operated in a single chamber configuration 2T-I-12  

E-Print Network [OSTI]

on the anode, producing a complex response in fuel cell power output. Under optimized gas compositions and flowAnode-supported thin-film fuel cells operated in a single chamber configuration 2T-I-12 Zongping of anode-supported, thin-film, single chamber fuel cells (SCFCs) have been investigated. Cells, in which Ni

Haile, Sossina M.

322

First-Principles Study of MetalCarbide/Nitride Adhesion: Al/VC vs. Al/VN Donald J. Siegel  

E-Print Network [OSTI]

-oxide ce- ramics. Within this class, the transition metal carbides and ni- trides are a particularly knowledge, there have been only three studies of adhesion between metals and transition metal carbidesFirst-Principles Study of Metal­Carbide/Nitride Adhesion: Al/VC vs. Al/VN Donald J. Siegel

Adams, James B

323

Giant Quadrupole-Resonance in Ni Isotopes  

E-Print Network [OSTI]

Inelastic scattering of 129 MeV alpha particles has been used to excite the giant quadrupole resonance in Ni-58, Ni-60, Ni-62, Ni-64. The resonance was found to exhaust 58 +/- 12%, 76 +/- 14%, 78 +/- 14%, and 90 +/-16% of the E2 energy-weighted sum...

Youngblood, David H.; Lui, YW; Garg, U.; Peterson, R. J.

1992-01-01T23:59:59.000Z

324

ALS Reveals New State of Matter  

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325

Active Oxygen on Au/TiO2 Catalysts DOI: 10.1002/anie.201102062 Active oxygen on a Au/TiO2 catalyst Formation, stability and CO  

E-Print Network [OSTI]

1 Active Oxygen on Au/TiO2 Catalysts DOI: 10.1002/anie.201102062 Active oxygen on a Au/TiO2 are the activation of molecular oxygen, the active site for this reaction step, and the nature of the catalytically active oxygen species present under working conditions.[3;9-15] Stiehl et al. had shown that molecularly

Pfeifer, Holger

326

Structure and hydrogen dynamics of pure and Ti-doped sodium alanate Jorge iguez,1,2  

E-Print Network [OSTI]

Structure and hydrogen dynamics of pure and Ti-doped sodium alanate Jorge Íńiguez,1,2 T. Yildirim,1, Honolulu, Hawaii 96822, USA (Received 2 June 2004; published 3 August 2004) We have studied the structure, energetics, and dynamics of pure and Ti-doped sodium alanate NaAlH4 , focusing on the possibility

Yildirim, Taner

327

ALS 20th Anniversary Celebration  

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328

ALS Doctoral Fellowship in Residence  

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329

ALS Evidence Confirms Combustion Theory  

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330

ALS Evidence Confirms Combustion Theory  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May JunDatastreamsmmcrcalgovInstrumentsrucLasDelivered‰PNGExperience4AJ01) (See95TI07)Operations DuringALS Doctoral Fellowship inALSALSALS

331

Influence of nuclear structure on sub-barrier hindrance in Ni+Ni fusion  

E-Print Network [OSTI]

Fusion-evaporation cross sections for $^{64}$Ni+$^{64}$Ni have been measured down to the 10 nb level. For fusion between two open-shell nuclei, this is the first observation of a maximum in the $S$-factor, which signals a strong sub-barrier hindrance. A comparison with the $^{58}$Ni+$^{58}$Ni, $^{58}$Ni+$^{60}$Ni, and $^{58}$Ni+$^{64}$Ni systems indicates a strong dependence of the energy where the hindrance occurs on the stiffness of the interacting nuclei.

C. L. Jiang; K. E. Rehm; R. V. F. Janssens; H. Esbensen; I. Ahmad; B. B. Back; P. Collon; C. N. Davids; J. P. Greene; D. J. Henderson; G. Mukherjee; R. C. Pardo; M. Paul; T. O. Pennington; D. Seweryniak; S. Sinha; Z. Zhou

2004-02-25T23:59:59.000Z

332

ALS@20  

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333

Novel Au-TiC Catalysts for CO Oxidation and Desulfurization Processes  

SciTech Connect (OSTI)

Recent articles dealing with the physical and chemical properties of novel Au-TiC catalysts are reviewed. High-resolution photoemission, scanning tunneling microscopy and first-principles periodic density-functional calculations were used to study the deposition of gold on a TiC(0 0 1) surface. Gold grows forming two-dimensional (very low coverage) and three-dimensional (medium and large coverage) islands on the carbide substrate. A positive shift in the binding energy of the C 1s core level is observed after the deposition of Au on TiC(0 0 1). The results of the density-functional calculations corroborate the formation of Au-C bonds. In general, the bond between Au and the TiC(0 0 1) surface exhibits very little ionic character, but there is a substantial polarization of electrons around Au that facilitates bonding of the adatoms with electron-acceptor molecules (CO, O{sub 2}, C{sub 2}H{sub 4}, SO{sub 2}, thiophene, etc.). Experimental measurements indicate that Au/TiC(0 0 1) is a very good catalysts for the oxidation of CO, the destruction of SO{sub 2} and the hydrodesulfurization of thiophene. At temperatures below 200 K, Au/TiC(0 0 1) is able to perform the 2CO + O{sub 2} {yields} 2CO{sub 2} reaction and the full decomposition of SO{sub 2}. Furthermore, in spite of the very poor hydrodesulfurization performance of TiC(0 0 1) or Au(1 1 1), a Au/TiC(0 0 1) surface displays a hydrodesulfurization activity higher than that of conventional Ni/MoS{sub x} catalysts. Metal carbides are excellent supports for enhancing the chemical reactivity of gold. The Au/TiC system is more chemically active than systems generated by depositing Au nanoparticles on oxide surfaces.

J Rodriguez; P Liu; Y Takahashi; F Vines; L Feria; E Florez; K Nakamura

2011-12-31T23:59:59.000Z

334

E-Print Network 3.0 - al-fe alloys strukturnyj Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Theory NiAl CoAl FeAl CoGa PdIn VT,1 A Q M 1, 0 128, 0 144... , with transition-metal vacancies (VT) for T-deficient ... Source: Collins, Gary S. - Department of Physics...

335

The Obviative Suffix -ni- In Algonquian  

E-Print Network [OSTI]

the marker -ni- is used specifically when an argument has been established as obviative earlier in the discourse. By tracing -ni- in the morphology of Fox and Kickapoo and in Bloomfield's comparative Algonquian work (Bloomfield 1946), the present paper...

Gathercole, Geoffrey

1979-01-01T23:59:59.000Z

336

(5.5) BRAZING OF METALLIC-INTERMETALLIC LAMINATE (MIL) Ti-6Al-4V/Al3Ti COMPOSITES  

E-Print Network [OSTI]

, appropriate joining techniques must be developed. Welding, diffusion-bonding and brazing are all viable the cooling rates. Furthermore, diffusion-bonding is possible (e.g. Ref. 6, Ref. 7), but long processing times titanium and titanium alloys, makes these (MIL) composites attractive candidates for aerospace and high

Meyers, Marc A.

337

Kinetics of Ni Sorption in Soils: Roles of Soil Organic Matter and Ni Precipitation  

E-Print Network [OSTI]

sorption in soils may be controlled by different reaction mechanisms at various time scales be an important path for Ni sequestration in soils.9 The mechanisms of Ni-LDH formation have been investigatedKinetics of Ni Sorption in Soils: Roles of Soil Organic Matter and Ni Precipitation Zhenqing Shi

Sparks, Donald L.

338

E-Print Network 3.0 - al metal irradiated Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Accelerator Beams , H. Ludewig1 Summary: effects on CTE of super-Invar. Figure 3: "Gum Metal" material characterization in its non-irradiated state... driver. Ti-6Al-4V....

339

E-Print Network 3.0 - al bulk crystals Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

are homogeneously dispersed in the residual glass of the bulk for Tc... consists of titanite (CaTiSiO5) and anorthite (CaAl2Si2O8) crystals that have nucleated heterogeneously......

340

(001) Oriented piezoelectric films prepared by chemical solution deposition on Ni foils  

SciTech Connect (OSTI)

Flexible metal foil substrates are useful in some microelectromechanical systems applications including wearable piezoelectric sensors or energy harvesters based on Pb(Zr,Ti)O{sub 3} (PZT) thin films. Full utilization of the potential of piezoelectrics on metal foils requires control of the film crystallographic texture. In this study, (001) oriented PZT thin films were grown by chemical solution deposition (CSD) on Ni foil and Si substrates. Ni foils were passivated using HfO{sub 2} grown by atomic layer deposition in order to suppress substrate oxidation during subsequent thermal treatment. To obtain the desired orientation of PZT film, strongly (100) oriented LaNiO{sub 3} films were integrated by CSD on the HfO{sub 2} coated substrates. A high level of (001) LaNiO{sub 3} and PZT film orientation were confirmed by X-ray diffraction patterns. Before poling, the low field dielectric permittivity and loss tangents of (001) oriented PZT films on Ni are near 780 and 0.04 at 1?kHz; the permittivity drops significantly on poling due to in-plane to out-of-plane domain switching. (001) oriented PZT film on Ni displayed a well-saturated hysteresis loop with a large remanent polarization ?36??C/cm{sup 2}, while (100) oriented PZT on Si showed slanted P-E hysteresis loops with much lower remanent polarizations. The |e{sub 31,f}| piezoelectric coefficient was around 10.6?C/m{sup 2} for hot-poled (001) oriented PZT film on Ni.

Yeo, Hong Goo, E-mail: hxy162@psu.edu; Trolier-McKinstry, Susan [Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802 (United States)

2014-07-07T23:59:59.000Z

Note: This page contains sample records for the topic "ni ti al" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


341

Formation of Ti-B surface alloys by excimer laser mixing  

SciTech Connect (OSTI)

We have formed a surface Ti-B alloy by excimer laser mixing of a single B layer on a Ti-6Al-4V alloy substrate. Rutherford backscattering spectroscopy indicates a uniform B:Ti ratio of approximately 0.7 in the surface layer. A Boron layer 60 nm thick resulted in an alloy layer approximately 200 nm thick. There is little indication, by either Auger electron spectroscopy or nuclear reaction analysis, of substantial oxygen incorporation in the surface alloy despite the fact that the processing was done in air. Transmission electron microscopy of the surface alloy shows a completely amorphous surface layer underlain by a martensitic structure.

Jervis, T.R.; Nastasi, M.; Hirvonen, J.P.; Zocco, T.G.

1990-01-01T23:59:59.000Z

342

Microstructure and mechanical properties of Ti/AlTiN/Ti-diamondlike carbon composite coatings on steel  

E-Print Network [OSTI]

such as dry high-speed milling, turning, tapping, and drilling, or when minimal lubrication is required of lubricant recycling along with eliminating the need to maintain complicated lubricating systems in modern.1, or even less in air,6­9 oil, and water.10 Metal-containing diamondlike carbon (Me-DLC) is a DLC film

Volinsky, Alex A.

343

AL. I  

Office of Legacy Management (LM)

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344

ALS Visitors  

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345

ALS Visitors  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

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346

Industry @ ALS  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May Jun Jul(Summary)morphinanInformation Desert Southwest Region service area.Portaldefault Sign In AboutIn theIndustry @ ALS

347

ALS Operating Schedule on Google Calendar  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May JunDatastreamsmmcrcalgovInstrumentsrucLasDelivered‰PNGExperience4AJ01) (See95TI07)Operations DuringALS Doctoral FellowshipALS

348

ALS Reveals New State of Matter  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May JunDatastreamsmmcrcalgovInstrumentsrucLasDelivered‰PNGExperience4AJ01) (See95TI07)Operations DuringALS DoctoralALS Reveals New State

349

ALS Reveals New State of Matter  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May JunDatastreamsmmcrcalgovInstrumentsrucLasDelivered‰PNGExperience4AJ01) (See95TI07)Operations DuringALS DoctoralALS Reveals New

350

Thermodynamics of TiO{sub x} in blast furnace-type slags  

SciTech Connect (OSTI)

Equilibrium studies between CaO-SiO{sub 2}-10 pct MgO-Al{sub 2}O{sub 3}-TiO{sub 1.5}-TiO{sub 2} slags, carbon-saturated iron, and a carbon monoxide atmosphere were performed at 1773 K to determine the activities of TiO{sub 1.5} and TiO{sub 2} in the slag. These thermodynamic parameters are required to predict the formation of titanium carbonitride in the blast furnace. In order to calculate the activity of titanium oxide, the activity coefficient of titanium in carbon-saturated iron-carbon-titanium alloys was determined by measuring the solubility of titanium in carbon-saturated iron in equilibrium with titanium carbide. The solubility and the activity coefficient of titanium obtained were 1.3 pct and 0.023 relative to 1 wt pct titanium in liquid iron or 0.0013 relative to pure solid titanium at 1773 K, respectively. Over the concentration range studied, the effect of the TiO{sub x} content on its activity coefficient is small. In the slag system studied containing 35 to 50 pct CaO, 25 to 45 pct SiO{sub 2}, 7 to 22 pct Al{sub 2}O{sub 3}, and 10 pct MgO, the activity coefficients of TiO{sub 1.5} and TiO{sub 2} relative to pure solid standard states range from 2.3 to 8.8 and from 0.1 to 0.3, respectively. Using thermodynamic data obtained, the prediction of the formation of titanium carbonitride was made. Assuming hypothetical TiO{sub 2}, i.e., total titanium in the slag expressed as TiO{sub 2}, and using the values of the activity coefficients of TiO{sub 1.5} and TiO{sub 2} determined, the equilibrium distribution of titanium between blast furnace-type slags and carbon-saturated iron was computed. The value of [pct Ti]/(pct TiO{sub 2}) ranges from 0.1 to 0.2.

Morizane, Y.; Ozturk, B.; Fruehan, R.J. [Carnegie Mellon Univ., Pittsburgh, PA (United States). Dept. of Materials Science and Engineering

1999-02-01T23:59:59.000Z

351

Elastic and anelastic relaxations associated with phase transitions in EuTiO3  

E-Print Network [OSTI]

resonance peaks are totally attenuated (superattenuation). The pinning process is still complete by ~400 K, however. 42 If the twin walls in EuTiO3 are subject to pinning by oxygen vacancies as in LaAlO3, it is likely that their freezing interval will also... resonance peaks are totally attenuated (superattenuation). The pinning process is still complete by ~400 K, however. 42 If the twin walls in EuTiO3 are subject to pinning by oxygen vacancies as in LaAlO3, it is likely that their freezing interval will also...

Spalek, Leszek J.; Saxena, Siddharth S.; Panagopoulos, Christos; Katsufuji, Takuro; Schiemer, Jason A.; Carpenter, Michael A.

2014-08-29T23:59:59.000Z

352

2nd RESPOND project Workshop "Id tifi ti d l f k t b d ti"Identification and analyses of market-based response options  

E-Print Network [OSTI]

pricing A t ti l d t l Nickel-Hydride, Lithium-Ion, Polymer, Metal-air (Zn, Al, Mg) Compressed air energy-based response options aimed at increasing the contribution of variable energy resources such as Wind, technology) ­ Storage of electricity or heat 4 ­ Storage of electricity or heat ­ New demand technologies

353

3d X 3d X SrTiO3Ti 2p 3d  

E-Print Network [OSTI]

XX 3d X 3d X X XX X XX SrTiO3Ti 2p 3d SrTiO3Ti 2p 3d 2p 2p SrTiO3 ts) 2p3/2 (t2g) 2p3/2 (e ) 2p1/2 (eg)2p SrTiO3 3d unit (t2g) (eg) (eg)2p1/2 (t2g)3d (Ti Fe Cu) arb. ( 2g) (Ti, Fe, Cu) y(ansitynten 3d In 3d 468464460456 · Photon Energy (e

Katsumoto, Shingo

354

Present status of the KADoNiS database  

E-Print Network [OSTI]

The "Karlsruhe Astrophysical Database of Nucleosynthesis in Stars" (KADoNiS) project is an online database for experimental cross sections relevant to the $s$ process and $p$ process. It is available under \\http://nuclear-astrophysics.fzk.de/kadonis and consists of two parts. Part 1 is an updated sequel to the well-known Bao et al. compilations from 1987 and 2000, which is online since April 2005. An extension of this $s$-process database to $(n,p)$ and $(n,\\alpha)$ cross sections at $kT$= 30 keV, as in the first version of the Bao compilation, is planned. The second part of KADoNiS is a $p$-process library, which includes all available experimental data from $(p,\\gamma)$, $(p,n)$, $(\\alpha,\\gamma)$, $(\\alpha,n)$, $(\\alpha,\\alpha)$, $(n,\\alpha)$ and $(\\gamma,n)$ reactions in or close to the respective Gamow window. Despite the great number of reactions required for a $p$-process reaction network, experimental data is still scarce and up to now restricted to stable targets. Given here is a short overview about the present status of the KADoNiS database.

I. Dillmann; R. Plag; M. Heil; F. Käppeler; T. Rauscher

2008-06-12T23:59:59.000Z

355

Structure Analysis of a Precipitate Phase in an Ni-Rich High Temperature  

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AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear Security Administrationcontroller systemsBiSiteNeutronStrategicOur Mission Oura metalloproteinofNiTiHf Shape

356

Effects of metallurgical variables on swelling of modified 316 and higher Ni austenitic stainless steels  

SciTech Connect (OSTI)

The effects of solute elements and cold-work on swelling in modified 316 and higher Ni advanced austenitic stainless steels developed for FBR core material were investigated together with the posted model alloys. The Si, P, B, Ti, Nb modified and cold-worked steels exhibited an improved swelling resistance. In the temperature range between 400 and 500 C, the swelling was suppressed significantly by an addition of 0.8 wt% Si. The beneficial effect of Si appears to be reduced in the steels without Ti and Nb tending to form {gamma}{prime} precipitates. In the temperature range between 500 and 600 C, a needle-like phosphide precipitates played an important role in suppressing void growth. Additions of Ti and/or Nb were found to stabilize the phosphide phase and extended the swelling incubation period. In the improved austenitic steels, the synergistic effect of cold-working and P, B, Ti, Nb additions act beneficially to stabilize the dislocation structure and to form finely dispersed precipitates during irradiation.

Shibahara, Itaru; Akasaka, Naoaki; Onose, Shoji [Power Reactor and Nuclear Fuel Development Corp., Oarai, Ibaraki (Japan)

1996-12-31T23:59:59.000Z

357

AlGaN/GaN metal-oxide-semiconductor heterostructure field-effect transistors using barium strontium titanate  

E-Print Network [OSTI]

AlGaN/GaN metal-oxide-semiconductor heterostructure field-effect transistors using barium strontium-effect transistors have been formed by incorporating barium strontium titanate (BST) deposited by rf magnetron in increased leakage. Due to its large dielectric constant, barium strontium ti- tanate [Ba1-xSrxTiO3, (BST

York, Robert A.

358

Sources of stress gradients in electrodeposited Ni MEMS.  

SciTech Connect (OSTI)

The ability of future integrated metal-semiconductor micro-systems such as RF MEMS to perform highly complex functions will depend on developing freestanding metal structures that offer improved conductivity and reflectivity over polysilicon structures. For example, metal-based RF MEMS technology could replace the bulky RF system presently used in communications, navigation, and avionics systems. However, stress gradients that induce warpage of active components have prevented the implementation of this technology. Figure 1, is an interference micrograph image of a series of cantilever beams fabricated from electrodeposited Ni. The curvature in the beams was the result of stress gradients intrinsic to the electrodeposition process. To study the sources of the stress in electrodeposition of Ni we have incorporated a wafer curvature based stress sensor, the multibeam optical stress sensor, into an electrodeposition cell. We have determined that there are two regions of stress induced by electrodepositing Ni from a sulfamate-based bath (Fig 2). The stress evolution during the first region, 0-1000{angstrom}, was determined to be dependent only on the substrate material (Au vs. Cu), whereas the stress evolution during the second region, >1000{angstrom}, was highly dependent on the deposition conditions. In this region, the stress varied from +0.5 GPa to -0.5GPa, depending solely on the deposition rate. We examined four likely sources for the compressive intrinsic stress, i.e. reduction in tensile stress, and determined that only the adatom diffusion into grain boundaries model of Sheldon, et al. could account for the observed compressive stress. In the presentation, we shall discuss the compressive stress generation mechanisms considered and the ramifications of these results on fabrication of electrodeposited Ni for MEMS applications.

Hearne, Sean Joseph; Floro, Jerrold Anthony; Dyck, Christopher William

2004-06-01T23:59:59.000Z

359

Comment on the Evidence for a Monopole Resonance at Approximately 20 Mev in Ni-58  

E-Print Network [OSTI]

be accompanied by a brief abstract and a keyword abstract. Comment on the evidence for a monopole resonance at approximately 20 MeV in 5sNi U. Garg, P. Bogucki, J. D. Bronson, Y. -W. Lui, C. M. Rozsa, * and D. H. Youngblood Cyclotron Institute, Texas AckM... Uniuersity, College Station, Texas 77843 (Received 23 September 1981) Small-angle inelastic a scattering data for "Ni at 129 MeV have been reanalyzed with the giant resonance peak parameters suggested by Bertrand et al. The two components of the giant...

Garg, U.; Bogucki, P.; Bronson, J. D.; Lui, YW; Rozsa, C. M.; Youngblood, David H.

1982-01-01T23:59:59.000Z

360

anketo chosa ni: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Summary: Recent research shows that the resistance switching characteristics of NiO thin film, in combinations conversion into NiSi using Ni-AMD, and discuss the chemistry of...

Note: This page contains sample records for the topic "ni ti al" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


361

anteisei ni kansuru: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Summary: Recent research shows that the resistance switching characteristics of NiO thin film, in combinations conversion into NiSi using Ni-AMD, and discuss the chemistry of...

362

atsumitsu katei ni: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Summary: Recent research shows that the resistance switching characteristics of NiO thin film, in combinations conversion into NiSi using Ni-AMD, and discuss the chemistry of...

363

arikata ni kansuru: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Summary: Recent research shows that the resistance switching characteristics of NiO thin film, in combinations conversion into NiSi using Ni-AMD, and discuss the chemistry of...

364

ataeru eikyo ni: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Summary: Recent research shows that the resistance switching characteristics of NiO thin film, in combinations conversion into NiSi using Ni-AMD, and discuss the chemistry of...

365

aisorui ni taisuru: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Summary: Recent research shows that the resistance switching characteristics of NiO thin film, in combinations conversion into NiSi using Ni-AMD, and discuss the chemistry of...

366

anzensei ni kansuru: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Summary: Recent research shows that the resistance switching characteristics of NiO thin film, in combinations conversion into NiSi using Ni-AMD, and discuss the chemistry of...

367

Dual Phase Li4 Ti5O12–TiO2 Nanowire Arrays As Integrated...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Phase Li4 Ti5O12–TiO2 Nanowire Arrays As Integrated Anodes For High-rate Lithium-ion Batteries. Dual Phase Li4 Ti5O12–TiO2 Nanowire Arrays As Integrated Anodes For...

368

Electrodeposited NiCo/Cu Superlattices  

SciTech Connect (OSTI)

NiCo/Cu superlattices were electrodeposited on polycrystalline Cu substrates from a single electrolyte under potentiostatic control. The X-ray diffraction (XRD) patterns showed that NiCo/Cu superlattices have the same crystal structure and texture as in their substrates. The films exhibited giant magnetoresistance (GMR) or anisotropic magnetoresistance (AMR), depending on the Cu layer thicknesses.

Safak, M.; Alper, M. [Department of Physics, Faculty of Science and Literature, University of Uludag, Goeruekle, Bursa (Turkey)

2007-04-23T23:59:59.000Z

369

Purification and Characterization of [NiFe]-Hydrogenase of Shewanella...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Purification and Characterization of NiFe-Hydrogenase of Shewanella oneidensis MR-1. Purification and Characterization of NiFe-Hydrogenase of Shewanella oneidensis MR-1....

370

As[sub 2]S[sub 3]/Sr(Ti[sub 0.7]Co[sub 0.3])O[sub 3] and As[sub 2]S[sub 3]/Sr(Ti[sub 0.6]Fe[sub 0.4])O[sub 3] strip-loaded waveguides for integrated magneto-optical isolator applications  

E-Print Network [OSTI]

Sr(Ti[sub 0.6]Fe[sub 0.4])O[sub 3] (STF) and Sr(Ti[sub 0.7]Co[sub 0.3])O[sub 3] (STC) room-temperature ferromagnetic oxides were grown epitaxially on LaAlO[sub 3](001), (LaSr)(AlTa)O[sub 3] (001) and Si (001) substrates. ...

Bi, Lei

371

Identification of an incommensurate FeAl{sub 2} overlayer on FeAl(110) using x-ray diffraction and reflectivity  

SciTech Connect (OSTI)

FeAl, like NiAl, crystallizes in the CsCl structure. Consequently the (110) planes contain equal amounts of Fe and Al distributed as interlocking rectangles. Unlike the NiAI(110) surface, which retains the (1{times}l) in-plane symmetry of the bulk, FeAl(l10) reconstructs to form an ordered, incommensurate overlayer. The reconstructed layer introduces x-ray diffraction rods at half-order positions along the [1{bar 1}0] direction, and displaced {plus_minus}0.2905 from integer positions along the [001] direction. Peak widths reveal excellent long range order. Specular reflectivity measurements above and below the Fe K{alpha} edge can be reproduced using a model containing a single reconstructed overlayer with an Fe:Al ratio of 1:2, consistent with FeA{sub I}2.

Baddorf, A.P. [Oak Ridge National Lab., TN (United States); Chandavarkar, S.S. [Tennessee Univ., Knoxville, TN (United States). Dept. of Physics and Astronomy

1995-06-30T23:59:59.000Z

372

ALS Ceramics Materials Research Advances Engine Performance  

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373

ALS Ceramics Materials Research Advances Engine Performance  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May JunDatastreamsmmcrcalgovInstrumentsrucLasDelivered‰PNGExperience4AJ01) (See95TI07)Operations During theALS

374

ALS History: The First 20 Years  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May JunDatastreamsmmcrcalgovInstrumentsrucLasDelivered‰PNGExperience4AJ01) (See95TI07)Operations DuringALS Doctoral Fellowship

375

ALS Operating Schedule on Google Calendar  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May JunDatastreamsmmcrcalgovInstrumentsrucLasDelivered‰PNGExperience4AJ01) (See95TI07)Operations DuringALS Doctoral FellowshipALSALS

376

ALS Reveals New State of Matter  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May JunDatastreamsmmcrcalgovInstrumentsrucLasDelivered‰PNGExperience4AJ01) (See95TI07)Operations DuringALS Doctoral FellowshipALSALSALS

377

ALS Reveals New State of Matter  

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AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May JunDatastreamsmmcrcalgovInstrumentsrucLasDelivered‰PNGExperience4AJ01) (See95TI07)Operations DuringALS Doctoral FellowshipALSALSALSALS

378

ALS Reveals New State of Matter  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May JunDatastreamsmmcrcalgovInstrumentsrucLasDelivered‰PNGExperience4AJ01) (See95TI07)Operations DuringALS Doctoral

379

Oxidation-resistant, solution-processed plasmonic Ni nanochain-SiO{sub x} (x?  

SciTech Connect (OSTI)

Metal oxidation at high temperatures has long been a challenge in cermet solar thermal absorbers, which impedes the development of atmospherically stable, high-temperature, high-performance concentrated solar power (CSP) systems. In this work, we demonstrate solution-processed Ni nanochain-SiO{sub x} (x?Ni nanochain-SiO{sub 2} selective solar thermal absorbers that exhibit a strong anti-oxidation behavior up to 600?°C in air. The thermal stability is far superior to previously reported Ni nanoparticle-Al{sub 2}O{sub 3} selective solar thermal absorbers, which readily oxidize at 450?°C. The SiO{sub x} (x?Ni/SiO{sub x} interface to passivate the surface of Ni nanoparticles and prevent oxidation. X-ray photoelectron spectroscopy and Raman spectroscopy demonstrate that the excess Si in the SiO{sub x} (x?Ni nanostructures to form silicides at the interfaces, which further improves the anti-oxidation properties. As a result, Ni-SiO{sub x} (x?Ni-SiO{sub 2} systems. This oxidation-resistant Ni nanochain-SiO{sub x} (x?

Yu, Xiaobai; Wang, Xiaoxin; Liu, Jifeng, E-mail: Jifeng.Liu@dartmouth.edu [Thayer School of Engineering, Dartmouth College, 14 Engineering Drive, Hanover, New Hampshire 03755 (United States); Zhang, Qinglin [Department of Chemical and Materials Engineering, University of Kentucky, 177 F. Paul Anderson Tower, Lexington, Kentucky 40506 (United States); Li, Juchuan [Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)

2014-08-21T23:59:59.000Z

380

Stoichiometry-driven metal-to-insulator transition in NdTiO{sub 3}/SrTiO{sub 3} heterostructures  

SciTech Connect (OSTI)

By controlling stoichiometry via a hybrid molecular beam epitaxy approach, we report on the study of thin film growth and the electronic transport properties of phase-pure, epitaxial NdTiO{sub 3}/SrTiO{sub 3} heterostructures grown on (001) (La{sub 0.3}Sr{sub 0.7})(Al{sub 0.65}Ta{sub 0.35})O{sub 3} (LSAT) substrates as a function of cation stoichiometry in NdTiO{sub 3}. Despite the symmetry mismatch between bulk NdTiO{sub 3} and the substrate, NdTiO{sub 3} films grew in an atomic layer-by-layer fashion over a range of cation stoichiometry; however amorphous films resulted in cases of extreme cation non-stoichiometry. Temperature-dependent sheet resistance measurements were consistent with Fermi-liquid metallic behavior over a wide temperature range, but revealed a remarkable crossover from metal-to-insulator (M-I) type behavior at low temperatures for all compositions. A direct correlation between cation stoichiometry, transport behavior, and the temperature of M-I transition is established.

Xu, Peng; Phelan, Daniel; Seok Jeong, Jong; Andre Mkhoyan, K.; Jalan, Bharat, E-mail: bjalan@umn.edu [Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455 (United States)

2014-02-24T23:59:59.000Z

Note: This page contains sample records for the topic "ni ti al" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


381

Superior Corrosion Resistance Properties of TiN-Based Coatings on Zircaloy Tubes in Supercritical Water  

SciTech Connect (OSTI)

Thin films of TiN and Ti0.35Al0.65N nanocomposite were deposited on polished Zircaloy-4 tubes. After exposure to supercritical water for 48 h, the coated tubes are remarkably intact, while the bare uncoated tube shows severe oxidation and breakaway corrosion. X-ray diffraction patterns, secondary electron images, backscattered electron images, and energy dispersive X-ray spectroscopy data from the tube surfaces and cross-sections show that a protective oxide, formed on the film surface, effectively prevents further oxidation and corrosion to the Zircaloy-4 tubes. This result demonstrates the effectiveness of thin film ceramics as protective coatings under extreme environments.

Fauzia Khatkhatay; Liang Jiao; Jie Jian; Zhijie Jiao; Hongbin Zhang; Jian Gan; Haiyan Wang; Wenrui Zhang; Xinghang Zhang

2014-08-01T23:59:59.000Z

382

Electroslag surfacing of steel shafting with Ni alloy 625 and 70Cu-30Ni strip  

SciTech Connect (OSTI)

A comprehensive study of electroslag surfacing (ESS) of steel with Ni Alloy 625 and 70Cu-30Ni strip electrodes was conducted to establish the feasibility of replacing forged bearing sleeves on propulsion shafting with integral weld surfacing. The base material was MIL-S-23284, Class 1 steel in the form of 41--66 cm (16--26 in.) diameter shafting and 76 mm (3 in.) thick flat plate. All ESS was carried out at a heat input level of approximately 5.9kJ/mm (150 kJ/in.) using 30 x 0.5 mm (1.2 x 0.02 in.) strip electrodes. Assessments of mechanical properties and microstructure of Ni Alloy 625 surfacing and 70Cu-30Ni surfacing were conducted to establish the structure-property relationships in these complex alloy systems. In addition, a solidification cracking test was developed to determine the relative cracking susceptibilities of these strip surfacing alloys. Although the Ni Alloy 625 surfacing contained small islands of interdendritic MC type carbides and Laves phase, the mechanical properties of this surfacing were satisfactory. The 70Cu-30Ni surfacing required a buttering layer of 30Cu-70Ni or pure Ni to prevent solidification cracking. The inherent ductility-dip sensitivity of 70Cu-30Ni surfacing was overcome by the development of a suitable ESS procedure.

Devletian, J.H.; Gao, Y.P.; Wood, W.E. [Oregon Graduate Inst. of Science and Technology, Portland, OR (United States)

1996-12-31T23:59:59.000Z

383

New Ni Amidinate Source for ALD/CVD of NiNx, NiO and NiSi , Thiloma Perera1  

E-Print Network [OSTI]

to be particularly important in memory as well as logic applications. Nickel silicide (NiSi) is emerging with a metal-insulator-metal (MIM) structure, offer potential applications for the next generation nonvolatile

384

Transformation Cyclic Damage of Near-equiatomic Ni-Ti Yinong Liu1,a  

E-Print Network [OSTI]

distortion. Cycling through this transformation, induced thermally, mechanically or by the combination, shape memory alloys, pseudoelasticity, mechanical behaviour, pseudoelasticity, thermal cycling Abstract. This study investigates the effect of transformation cycling and heat treatment on the property stability

Zheng, Yufeng

385

THE TENSILE BEHAVIOR OF Ti36Ni49Hf15 HIGH TEMPERATURE SHAPE MEMORY ALLOY  

E-Print Network [OSTI]

tensile testing. L and LT represent the length after loading followed by unloading and that after heating

Zheng, Yufeng

386

Experimental Studies on Dynamic Vibration Absorber using Shape Memory Alloy (NiTi) Springs  

SciTech Connect (OSTI)

Shape memory alloy (SMA) springs have been used as actuators in many applications although their use in the vibration control area is very recent. Since shape memory alloys differ from conventional alloy materials in many ways, the traditional design approach for springs is not completely suitable for designing SMA springs. Some vibration control concepts utilizing unique characteristics of SMA's will be presented in this paper.A dynamic vibration absorber (DVA) using shape memory alloy (SMA) actuator is developed for attenuation of vibration in a cantilever beam. The design procedure of the DVA is presented. The system consists of a cantilever beam which is considered to generate the real-time vibration using shaker. A SMA spring is used with a mass attached to its end. The stiffness of the SMA spring is dynamically varied in such a way to attenuate the vibration. Both simulation and experimentation are carried out using PID controller. The experiments were carried out by interfacing the experimental setup with a computer using LabVIEW software, Data acquisition and control are implemented using a PCI data acquisition card. Standard PID controllers have been used to control the vibration of the beam. Experimental results are used to demonstrate the effectiveness of the controllers designed and the usefulness of the proposed test platform by exciting the structure at resonance. In experimental setup, an accelerometer is used to measure the vibration which is fed to computer and correspondingly the SMA spring is actuated to change its stiffness to control the vibration. The results obtained illustrate that the developed DVA using SMA actuator is very effective in reducing structural response and have great potential to be an active vibration control medium.

Kumar, V. Raj; Kumar, M. B. Bharathi Raj; Kumar, M. Senthil [Department of Mechanical Engineering, PSG College of Technology, Coimbatore (India)

2011-10-20T23:59:59.000Z

387

Processing and Characterization of NiTi Porous SMA by Elevated Pressure Sintering  

E-Print Network [OSTI]

metallurgy, sintering, quasi- static loading, impact loading, HIP, Self-propagating High temperature memory alloys (SMAs) from elemental powders. These include conventional sintering, Self-propagating High temperature Synthesis (SHS), and sintering at elevated pressure via a Hot Isostatic Press (HIP). Conventional

388

Effect of ageing treatment on the transformation behaviour of Ti50.9 at.% Ni alloy  

E-Print Network [OSTI]

Engineering, The University of Western Australia, Crawley, WA 6009, Australia Received 20 June 2007; received, The University of Western Australia, Crawley, WA 6009 Australia. Tel.: +61 8 64883132; fax: +61 8 64881024. E

Zheng, Yufeng

389

Effect of ausforming via severe plastic deformation on shape memory behavior of NiTi  

E-Print Network [OSTI]

, pseudelasticity, interplay between plastic deformation via dislocation slip and twinning, and forward and reverse martensitic transformation. The samples are processed at room temperature, i.e. slightly above the austenite finish temperature, and at 450 °C, i...

Kulkarni, Ajay V.

2006-04-12T23:59:59.000Z

390

amorphous ni-ti alloys: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Summary: alloy of composition correspond- ing to the metallic components of the superconduct- ing oxides respectivement. Abstract. - Previous quenching experiments on 2212...

391

The thermomechanical constitutive experimentation of NiTi shape memory alloy strips and rods  

E-Print Network [OSTI]

exothermic reactions. During an exothermic reaction, the heat supplied is decreased to maintain the cooling temperature rate. The exothermic reactions are represented as power valleys on the DSC therinogram. The first exothermic transformations is caused... as the R-phase transforms from parent phase. As the sample continues to cool, the rhombohedral lattice transitions into monoclinic martensite. Thermal cycling and two way training can separate the R-phase and martensite exothermic transformation peaks...

Howard, Stephen David

1995-01-01T23:59:59.000Z

392

Epitaxial growth of NiTiO3 with a distorted ilmenite structure. | EMSL  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

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393

Study of Martensitic Phase transformation in a NiTiCu Thin Film Shape  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

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394

alloying ni33 ti67: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

high strength aluminum alloys. The expense and Aluminum Alloys Exposure to a moist environment degrades the fatigue resistance of all aluminum alloys Acton, Scott 16 HIGHLY...

395

NbTiN Based SIS Multilayer Structures for SRF Applications  

SciTech Connect (OSTI)

For the past three decades, bulk niobium has been the material of choice for SRF cavities applications. RF cavity performance is now approaching the theoretical limit for bulk niobium. For further improvement of RF cavity performance for future accelerator projects, Superconductor ? Insulator - Superconductor (SIS) multilayer structures (as recently proposed by Alex Gurevich) present the theoretical prospect to reach RF performance beyond bulk Nb, using thinly layered higher-Tc superconductors with enhanced Hc1. Jefferson Lab (JLab) is pursuing this approach with the development of NbTiN and AlN based multilayer SIS structures. This paper presents the results on the characteristics of NbTiN films and the first RF measurements on NbTiN-based multilayer structure on thick Nb films.

Valente, Anne-marie; Eremeev, Grigory; Phillips, H.; Reece, Charles; Spradlin, Joshua; Yang, Qiguang; Lukaszew, Rosa

2013-09-01T23:59:59.000Z

396

-and -Coordinated Al in AlC2 . A Combined  

E-Print Network [OSTI]

- and -Coordinated Al in AlC2 - and AlCSi- . A Combined Photoelectron Spectroscopy and ab Initio the structure and chemical bonding in AlC2 - and AlCSi-. AlC2 - was found to have a C2V structure whereas AlCSi- was found to be almost linear, thus establishing -coordination of Al in AlC2 - and -coordination in Al

Simons, Jack

397

ALS Capabilities Reveal How Like Can Attract Like  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

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398

ALS Capabilities Reveal How Like Can Attract Like  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

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399

ALS Capabilities Reveal Multiple Functions of Ebola Virus  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

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400

ALS Scientists Patent Technique To Dramatically Advance Grating-Based  

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Note: This page contains sample records for the topic "ni ti al" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


401

Nickel recovery from electronic waste II Electrodeposition of Ni and Ni–Fe alloys from diluted sulfate solutions  

SciTech Connect (OSTI)

Highlights: • Ni can be recovered from EG wastes as pure Ni or as Ni–Fe alloys. • The control of the experimental conditions gives a certain alloy composition. • Unusual deposits morphology shows different nucleation mechanisms for Ni vs Fe. • The nucleation mechanism was progressive for Ni and instantaneous for Fe and Ni–Fe. - Abstract: This study focuses on the electrodeposition of Ni and Ni–Fe alloys from synthetic solutions similar to those obtained by the dissolution of electron gun (an electrical component of cathode ray tubes) waste. The influence of various parameters (pH, electrolyte composition, Ni{sup 2+}/Fe{sup 2+} ratio, current density) on the electrodeposition process was investigated. Scanning electron microscopy (SEM) and X-ray fluorescence analysis (XRFA) were used to provide information about the obtained deposits’ thickness, morphology, and elemental composition. By controlling the experimental parameters, the composition of the Ni–Fe alloys can be tailored towards specific applications. Complementarily, the differences in the nucleation mechanisms for Ni, Fe and Ni–Fe deposition from sulfate solutions have been evaluated and discussed using cyclic voltammetry and potential step chronoamperometry. The obtained results suggest a progressive nucleation mechanism for Ni, while for Fe and Ni–Fe, the obtained data points are best fitted to an instantaneous nucleation model.

Robotin, B. [Babes-Bolyai University, Faculty of Chemistry and Chemical Engineering, 11 Arany Janos Street, RO-400028 Cluj-Napoca (Romania); Ispas, A. [Fachgebiet Elektrochemie und Galvanotechnik II, Technische Universität Ilmenau, D-98693 Ilmenau (Germany); Coman, V. [Babes-Bolyai University, Faculty of Chemistry and Chemical Engineering, 11 Arany Janos Street, RO-400028 Cluj-Napoca (Romania); Bund, A. [Fachgebiet Elektrochemie und Galvanotechnik II, Technische Universität Ilmenau, D-98693 Ilmenau (Germany); Ilea, P., E-mail: pilea@chem.ubbcluj.ro [Babes-Bolyai University, Faculty of Chemistry and Chemical Engineering, 11 Arany Janos Street, RO-400028 Cluj-Napoca (Romania)

2013-11-15T23:59:59.000Z

402

Highly uniform bipolar resistive switching characteristics in TiO{sub 2}/BaTiO{sub 3}/TiO{sub 2} multilayer  

SciTech Connect (OSTI)

Nanoscale multilayer structure TiO{sub 2}/BaTiO{sub 3}/TiO{sub 2} has been fabricated on Pt/Ti/SiO{sub 2}/Si substrate by chemical solution deposition method. Highly uniform bipolar resistive switching (BRS) characteristics have been observed in Pt/TiO{sub 2}/BaTiO{sub 3}/TiO{sub 2}/Pt cells. Analysis of the current-voltage relationship demonstrates that the space-charge-limited current conduction controlled by the localized oxygen vacancies should be important to the resistive switching behavior. X-ray photoelectron spectroscopy results indicated that oxygen vacancies in TiO{sub 2} play a crucial role in the resistive switching phenomenon and the introduced TiO{sub 2}/BaTiO{sub 3} interfaces result in the high uniformity of bipolar resistive switching characteristics.

Ma, W. J.; Zhang, X. Y.; Wang, Ying; Zheng, Yue, E-mail: zhengy35@mail.sysu.edu.cn, E-mail: wangbiao@mail.sysu.edu.cn [State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics and Engineering, Sun Yat-Sen University, 510275 Guangzhou (China) [State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics and Engineering, Sun Yat-Sen University, 510275 Guangzhou (China); Micro and Nano Physics and Mechanics Research Laboratory, School of Physics and Engineering, Sun Yat-Sen University, 510275 Guangzhou (China); Lin, S. P. [Micro and Nano Physics and Mechanics Research Laboratory, School of Physics and Engineering, Sun Yat-Sen University, 510275 Guangzhou (China) [Micro and Nano Physics and Mechanics Research Laboratory, School of Physics and Engineering, Sun Yat-Sen University, 510275 Guangzhou (China); Sino-French Institute of Nuclear Engineering and Technology, Zhuhai Campus, Sun Yat-Sen University, Zhuhai 519082 (China); Luo, J. M.; Wang, B., E-mail: zhengy35@mail.sysu.edu.cn, E-mail: wangbiao@mail.sysu.edu.cn [State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics and Engineering, Sun Yat-Sen University, 510275 Guangzhou (China); Li, Z. X. [Micro and Nano Physics and Mechanics Research Laboratory, School of Physics and Engineering, Sun Yat-Sen University, 510275 Guangzhou (China)] [Micro and Nano Physics and Mechanics Research Laboratory, School of Physics and Engineering, Sun Yat-Sen University, 510275 Guangzhou (China)

2013-12-23T23:59:59.000Z

403

Formation of mixed oxide powders in flames: Part I. TiO sub 2 --SiO sub 2  

SciTech Connect (OSTI)

Mixed oxide powders, e.g., Al{sub 2}O{sub 3}--TiO{sub 2}, SiO{sub 2}--GeO{sub 2}, and TiO{sub 2}--SiO{sub 2}, are used in industry to produce ceramics, optical fibers, catalysts, and paint opacifiers. The properties of these products depend upon the morphology of the powders. Ceramics and optical fibers are produced using either a uniform mixture of multicomponent particles or a uniform solution. The desired morphology for catalysts is a high surface area and many active sites. TiO{sub 2} coated with a layer of SiO{sub 2} is the desired structure for use as a paint opacifier. In this paper, TiO{sub 2}--SiO{sub 2} mixed oxide powders were synthesized using a counterflow diffusion flame burner. TiCl{sub 4} and SiCl{sub 4} were used as source materials for the formation of oxide particles in hydrogen-oxygen flames. In-situ particle sizes were determined using dynamic light scattering. A thermophoretic sampling method also was used to collect particles directly onto carbon coated grids, and their size, morphology, and crystalline form examined using a transmission electron microscope. A photomultiplier at 90{degree} to the argon ion laser beam was used to measure the light-scattering intensity. The effect of temperature and of Si to Ti concentration ratio on particle morphology was investigated. Strong temperature dependence was observed. At high temperatures, TiO{sub 2} particles were covered with discrete SiO{sub 2} particles. At low temperatures, the structure changes to TiO{sub 2} particles encapsulated by SiO{sub 2}. TEM diffraction pattern measurements showed that the TiO{sub 2} is rutile and the SiO{sub 2} is amorphous silica. At high Si to Ti ratios, SiO{sub 2}-encapsulated TiO{sub 2} particles form. At low Si to Ti ratios, one obtains TiO{sub 2} particles covered with discrete SiO{sub 2} particles.

Hung, C.; Katz, J.L. (Department of Chemical Engineering, The Johns Hopkins University, Baltimore, Maryland 21218 (United States))

1992-07-01T23:59:59.000Z

404

Patterned Growth of TiO2 Nanowires on Titanium Substrates Jong-Yoon Ha1;2  

E-Print Network [OSTI]

and short processing time utilizes the Ti foil both as a substrate and as a metal supply, thus eliminating transport methods. Adachi et al. have reported the synthesis of titania NWs using hydrothermal reactions, these methods typically require complex setups and processes, harsh environmental conditions, and extended

Lin, Liwei

405

Carbon Nanotube Growth Using Ni Catalyst in Different Layouts  

E-Print Network [OSTI]

Vertically aligned carbon nanotubes have been grown using Ni as catalyst by plasma enhanced chemical vapor deposition system (PECVD) in various pre-patterned substrates. Ni was thermally evaporated on silicon substrates ...

Nguyen, H. Q.

406

Energy absorption in Ni-Mn-Ga/ polymer composites  

E-Print Network [OSTI]

In recent years Ni-Mn-Ga has attracted considerable attention as a new kind of actuator material. Off-stoichiometric single crystals of Ni2MnGa can regularly exhibit 6% strain in tetragonal martensites and orthorhombic ...

Feuchtwanger, Jorge

2006-01-01T23:59:59.000Z

407

ag fe ni: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

conduction-band states of NiO 100 thin films grown onto Ag 100 have charac- terized NiO monocrystalline thin films has shown up both onto insulating i.e., MgO, Ref. 21 Marcon,...

408

Good and bad features of Ni-Cd cell designs  

SciTech Connect (OSTI)

Processes for spacecraft Ni-Cd cells are reviewed. Mechanical impregnation is compared against chemical and thermochemical impregnation.

Gross, S.

1996-02-01T23:59:59.000Z

409

Synthesis of superheavy element 120 via {sup 50}Ti+{sup A}Cf hot fusion reactions  

SciTech Connect (OSTI)

Synthesis of superheavy element 120 in terms of the {sup 50}Ti+{sup 249-252}Cf fusion-evaporation reactions is evaluated and discussed. It is found that the reactions of {sup 250,251}Cf({sup 50}Ti,3n){sup 297,298}120 and {sup 251,252}Cf({sup 50}Ti,4n){sup 297,298}120 are relatively favorable with the maximum evaporation-residue cross sections of 0.12, 0.09, 0.11, and 0.25 pb, respectively. However, {sup 252}Cf may be difficult to be target because its spontaneous fission will bring about serious background in the experiment. Fusion probabilities for different target-projectile combinations leading to the formation of surperheavy nucleus {sup 302}120 are estimated with the ''fusion-by-diffusion'' model and presented as a function of the Coulomb parameter Z{sub 1}Z{sub 2}/(A{sub 1}{sup 1/3}+A{sub 2}{sup 1/3}). Among the reactions {sup 50}Ti+{sup 252}Cf, {sup 54}Cr+{sup 248}Cm, {sup 58}Fe+{sup 244}Pu, and {sup 64}Ni+{sup 238}U, the reaction {sup 50}Ti+{sup 252}Cf has the largest fusion probability. Synthesis of superheavy element 120 is of essential importance for determining whether the magic proton shell should be at Z=114 or at higher proton numbers Z=120-126. Therefore, the experiment to produce isotopes with Z=120 in the fusion reactions {sup 50}Ti+{sup 250,251}Cf is of great interest.

Liu, Z. H. [China Institute of Atomic Energy, Beijing 102413 (China); Bao Jingdong [Department of Physics, Beijing Normal University, Beijing 100875 (China); Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator, Lanzhou 730000 (China)

2009-11-15T23:59:59.000Z

410

Howes et al. Reply  

E-Print Network [OSTI]

Howes et al. Reply to Comment on "Kinetic Simulations of Magnetized Turbulence in Astrophysical Plasmas" arXiv:0711.4355

G. G. Howes; S. C. Cowley; W. Dorland; G. W. Hammett; E. Quataert; A. A. Schekochihin; T. Tatsuno

2008-12-12T23:59:59.000Z

411

A=16Mg (1993TI07)  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

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412

A=20Na (1998TI06)  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

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413

A=20O (1998TI06)  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

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414

A=20n (1998TI06)  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

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415

A=3H (1987TI07)  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

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416

A=8Li (2004TI06)  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

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417

Electronic structure mechanism of spin-polarized electron transport in a NiC60Ni system  

E-Print Network [OSTI]

Laboratory, Weapons and Materials Research Directorate, ATTN: AMSRD-ARL-WM, Aberdeen Proving Ground, MD 21005 Abstract The nature of chemical bonding and its effect on spin-polarized electron transport in Ni­C60­Ni couple with metallic electrodes (e. g. Ni and Au), a key requirement for the Kondo effect

Pandey, Ravi

418

X-ray Absorption Measurements on Nickel Cathode of Sodium-beta Alumina batteries: Fe-Ni-CI Chemical Associations  

SciTech Connect (OSTI)

Sections of Na-Al-NiCl2 cathodes from sodium-beta alumina ZEBRA batteries have been characterized with X-ray fluorescence mapping, and XANES measurements to probe the microstructure, elemental correlation, and chemical speciation after voltage cycling. Cycling was performed under identical load conditions at either 240 or 280 °C operating temperature and subsequently quenched in either the charged or discharged state. X-ray fluorescence mapping and XANES measurements were made adjacent to the current collector and ?"-Al2O3 solid electrolyte interfaces to detect possible gradients in chemical properties across the cathode. An FeS additive, introduced during battery synthesis, was found to be present as either Fe metal or an Fe(II) chloride in all cathode samples. X-ray fluorescence mapping reveals an operating temperature and charge-state dependent spatial correlation between Fe, Ni, and Cl concentration. XANES measurements indicate that both Ni and Fe are chemically reactive and shift between metallic and chloride phases in the charged and discharged states, respectively. However the percentage of chemically active Ni and Fe is significantly less in the cell operated at lower temperature. Additionally, the cathode appeared chemically homogeneous at the scale of our X-ray measurements.

Bowden, Mark E.; Alvine, Kyle J.; Fulton, John L.; Lemmon, John P.; Lu, Xiaochuan; Webb-Robertson, Bobbie-Jo M.; Heald, Steve M.; Balasubramanian, Mahalingam; Mortensen, Devon R.; Seidler, Gerald T.; Hess, Nancy J.

2014-02-01T23:59:59.000Z

419

Corrosion resistance and friction of sintered NdFeB coated with Ti/TiN multilayers  

E-Print Network [OSTI]

Corrosion resistance and friction of sintered NdFeB coated with Ti/TiN multilayers Yuanyuan Cheng Polarization Fretting corrosion Ti/TiN multilayers were deposited on sintered NdFeB by radio frequency magnetron sputtering. The film grain size decreased with the number of multilayers in the stack. Corrosion

Volinsky, Alex A.

420

Solidification characterization of a new rapidly solidified Ni-Cr-Co based superalloy  

SciTech Connect (OSTI)

The solidification characterization of a new rapidly solidified Ni-Cr-Co based superalloy prepared by plasma rotating electrode process was investigated by means of optical microscope, scanning electron microscope, and transmission electron microscope. The results show that the solidification microstructure changes from dendrites to cellular and microcrystal structures with decreasing powder size. The elements of Co, Cr, W and Ni are enriched in the dendrites, while Mo, Nb and Ti are higher in the interdendritic regions. The relationships between powder size with the average solid-liquid interface moving rate, the average interface temperature gradient and the average cooling rate are established. Microsegregation is increased with larger powder size. The geometric integrity of MC Prime type carbides in the powders changes from regular to diverse with decreasing powder size. The morphology and quantity of carbides depend on the thermal parameters and non-equilibrium solute partition coefficients during rapid solidification. - Highlights: Black-Right-Pointing-Pointer The relations of solidification thermal parameters with powder size are established. Black-Right-Pointing-Pointer The relation of non-equilibrium solute partition with powder size is investigated. Black-Right-Pointing-Pointer The solidification microstructure is related to thermal parameters. Black-Right-Pointing-Pointer The segregation behavior is linked to non-equilibrium partition coefficients. Black-Right-Pointing-Pointer The morphology and quantity of carbides depend on the above combined factors.

Wu, Kai, E-mail: wk-ustb@163.com [School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083 (China)] [School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083 (China); Liu, Guoquan [School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083 (China) [School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083 (China); State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083 (China); Hu, Benfu [School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083 (China)] [School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083 (China); Li, Feng [Department of Materials Science and Metallurgy, University of Cambridge, Cambridge CB2 3QZ (United Kingdom)] [Department of Materials Science and Metallurgy, University of Cambridge, Cambridge CB2 3QZ (United Kingdom); Zhang, Yiwen [School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083 (China) [School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083 (China); High Temperature Materials Research Institution, CISRI, Beijing 100081 (China); Tao, Yu; Liu, Jiantao [High Temperature Materials Research Institution, CISRI, Beijing 100081 (China)] [High Temperature Materials Research Institution, CISRI, Beijing 100081 (China)

2012-11-15T23:59:59.000Z

Note: This page contains sample records for the topic "ni ti al" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


421

Properties of electroless Ni-W-P amorphous alloys  

SciTech Connect (OSTI)

This paper describes work performed to determine some of the properties of the electroless Ni-W-P amorphous deposits. Phosphorus contents were varied up to 32 at.%, and the amorphous structure was found to be present at phosphorus contents above 5 at.%. Irrespective of P content, all the deposits exhibits excellent adhesion to metallic substrates. The addition of even small amounts of W provided greatly increased hardness compared with the plain Ni-P deposits. The wettability properties of the Ni-W-P deposits were found to be comparable to those of Ni-P and N-B-P deposits but inferior to those of Ni-B deposits.

Zhang Bangwei [Academia Sinica, Shenyang (China). International Centre of Materials Physics] [Academia Sinica, Shenyang (China). International Centre of Materials Physics; [Hunan Univ., Changsha (China). Dept. of Applied Physics; Hu Wangyu; Zhang Qinglong; Qu Xuanyuan [Hunan Univ., Changsha (China). Dept. of Applied Physics] [Hunan Univ., Changsha (China). Dept. of Applied Physics

1996-08-01T23:59:59.000Z

422

Microstructure of electrodeposited Cu-Ni binary alloy films  

SciTech Connect (OSTI)

The codeposition of Cu and Ni in the electrodeposition method without a complexing agent is difficult, since the standard electrode potentials of Cu and Ni differ by approximately 600 mV. In this study, the electrodeposited Cu-Ni alloy films with various compositions were obtained using glycine as the complexing agent. Consequently, composition of the deposited Cu-Ni alloy films can be controlled by bath composition and pH, and the crystallographic structure of all the deposited Cu-Ni alloy films consists of a single solid solution and is not influenced by pH.

Mizushima, Io; Chikazawa, Masatoshi; Watanabe, Tohru [Tokyo Metropolitan Univ. (Japan). Dept. of Industrial Chemistry

1996-06-01T23:59:59.000Z

423

In Situ XAS of Ni-W Hydrocracking Catalysts  

SciTech Connect (OSTI)

Ni-W based catalysts are very attractive in hydrotreating of heavy oil due to their high hydrogenation activity. In the present research, two catalyst samples, prepared by different methods, that exhibit significant differences in activity were sulfided in situ, and the local structure of the Ni and W were studied using X-ray absorption spectroscopy (XAS). The Ni XANES spectra were analyzed using a linear component fitting, and the EXAFS spectra of the WS2 platelets in the sulfided catalysts were modeled. The Ni and W are fully sulfided in the higher activity sample, and there are both unsulfided Ni ({approx}25%) and W (<10%) in the lower activity sample.

Yang, N. [Argonne National Laboratory, Argonne, IL 60439 (United States); Mickelson, G. E.; Greenlay, N.; Bare, Simon R. [UOP LLC, Des Plaines, IL 60016 (United States); Kelly, S. D. [EXAFS Analysis, Bolingbrook, IL 60440 (United States)

2007-02-02T23:59:59.000Z

424

Fabrication of TiO{sub 2} nanocrystallized glass  

SciTech Connect (OSTI)

Nanocrystallization of rutile and anatase was observed in a CaO-B{sub 2}O{sub 3}-Bi{sub 2}O{sub 3}-Al{sub 2}O{sub 3}-TiO{sub 2} crystallized glass. The color of the present crystallized glass was changed by the heat-treatment temperature, and x-ray diffraction (XRD) patterns of the crystallized glass show that the apparent color change is correlated with the formation of titania nanocrystallites. The particle size of crystallites observed in the transmission electron microscope image is comparable to that measured by XRD pattern. In addition, a large change of refractive index between the rutile particles and glass matrix, 0.8 or larger, was obtained. The present titania crystallized glass will be not only a photocatalytic material but also a promising candidate for random lasing devices.

Masai, Hirokazu; Fujiwara, Takumi; Mori, Hiroshi; Komatsu, Takayuki [Department of Applied Physics, Tohoku University, 6-6-05 Aoba, Sendai 980-8579 (Japan); Department of Materials Science and Technology, Nagaoka University of Technology, 1603-1 Kamitomioka, Nagaoka 940-2188 (Japan)

2007-02-19T23:59:59.000Z

425

Calculator Tips for TI-30XA  

E-Print Network [OSTI]

TI-30XA Calculator Tips. Calculator Memory. - To use the memory function, hit the STO key to store a number in either memory 1, 2, or 3. o To store the product of ...

Owen Davis

2013-01-04T23:59:59.000Z

426

ALS Users' Association Charter  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May JunDatastreamsmmcrcalgovInstrumentsrucLasDelivered‰PNGExperience4AJ01) (See95TI07)Operations DuringALSSpectrum PrintUsers' Association

427

ALS Users' Association Charter  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

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428

ALS Activity Reports  

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429

ALS Activity Reports  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

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430

ALS Beamlines Directory  

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431

ALS Beamlines Directory  

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432

ALS Chemistry Lab  

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433

ALS Communications Group  

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434

ALS Staff Photo  

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435

ALS User Meeting  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

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436

ALS User Meeting Archives  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

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437

ALS User Meeting Archives  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May JunDatastreamsmmcrcalgovInstrumentsrucLasDelivered‰PNGExperience4AJ01) (See95TI07)Operations DuringALSSpectrum Print BegunUser Meeting

438

ALS Users' Association Charter  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

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439

ALS Users' Association Charter  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May JunDatastreamsmmcrcalgovInstrumentsrucLasDelivered‰PNGExperience4AJ01) (See95TI07)Operations DuringALSSpectrum Print

440

Stripe-to-bubble transition of magnetic domains at the spin reorientation of (Fe/Ni)/Cu/Ni/Cu(001)  

SciTech Connect (OSTI)

Magnetic domain evolution at the spin reorientation transition (SRT) of (Fe/Ni)/Cu/Ni/Cu(001) is investigated using photoemission electron microscopy. While the (Fe/Ni) layer exhibits the SRT, the interlayer coupling of the perpendicularly magnetized Ni layer to the (Fe/Ni) layer serves as a virtual perpendicular magnetic field exerted on the (Fe/Ni) layer. We find that the perpendicular virtual magnetic field breaks the up-down symmetry of the (Fe/Ni) stripe domains to induce a net magnetization in the normal direction of the film. Moreover, as the virtual magnetic field increases to exceed a critical field, the stripe domain phase evolves into a bubble domain phase. Although the critical field depends on the Fe film thickness, we show that the area fraction of the minority domain exhibits a universal value that determines the stripe-to-bubble phase transition.

Wu, J.; Choi, J.; Won, C.; Wu, Y. Z.; Scholl, A.; Doran, A.; Hwang, Chanyong; Qiu, Z.

2010-06-09T23:59:59.000Z

Note: This page contains sample records for the topic "ni ti al" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


441

An Investigation into the evolution of damage and residual stresses in Ti6Al4V-Al?Ti metal intermetallic laminate (MIL) composites  

E-Print Network [OSTI]

in unidirectional ceramic-matrix composites, Compositesceramics fibers, they are chemically instable with many intermetallic matrices,ceramic reinforcements make them extremely susceptible to even small amounts of chemical interaction with the matrix.

Li, Tiezheng

2006-01-01T23:59:59.000Z

442

An Investigation into the evolution of damage and residual stresses in Ti6Al4V-Al?Ti metal intermetallic laminate (MIL) composites  

E-Print Network [OSTI]

by the self-propagating high- temperature synthesis (SHS) byand self propagating high temperature synthesis [3 - 5] By

Li, Tiezheng

2006-01-01T23:59:59.000Z

443

In-situ Spectroscopy of Water Oxidation at Ir Oxide Nanocluster Drivenby Visible TiOCr Charge-Transfer Chromophore in Mesoporous Silica  

SciTech Connect (OSTI)

An all-inorganic photocatalytic unit consisting of a binuclear TiOCr charge-transfer chromophore coupled to an Ir oxide nanocluster has been assembled on the pore surface of mesoporous silica AlMCM-41. In situ FT-Raman and EPR spectroscopy of an aqueous suspension of the resulting IrxOy-TiCr-AlMCM-41 powder reveal the formation of superoxide species when exciting the Ti(IV)OCr(III) --> Ti(III)OCr(IV) metal-to-metal charge-transfer chromophore with visible light. Use of H218O confirms that the superoxide species originates from oxidation of water. Photolysis in the absence of persulfate acceptor leads to accumulation of Ti(III) instead. The results are explained by photocatalytic oxidation of water at Ir oxide nanoclusters followed by trapping of the evolving O2 by transient Ti(III) centers to yield superoxide. Given the flexibility to select donor metals with appropriate redox potential, photocatalytic units consisting of a binuclear charge-transfer chromophore coupled to a water oxidation catalyst shown here constitute a step towards thermodynamically efficient visible light water oxidation units.

Frei, Heinz; Han, Hongxian; Frei, Heinz

2008-06-03T23:59:59.000Z

444

Electron-Transport Properties of Amorphous (Zr0.64ni0.36)1-Xalx Alloys  

E-Print Network [OSTI]

PHYSICAL REVIEW B VOLUME 39, NUMBER 17 15 JUNE 1989-I Electron transport properties of amorphous (Zro 64Nio 36), ?Al?alloys A. K. Bhatnagar, ' R. Pan, and D. G. Naugle Department ofPhysics, Texas Ad'cM Uniuersity, College Station, Texas 77843...-4242 (Received 28 November 1988; revised manuscript received 16 March 1989) Measurements of the electrical resistivity p(T), thermopower S(T), and Hall coe%cient RH for a series of rapidly quenched Zr-Ni-Al alloys are reported for concentrations from x =0 to 0...

BHATNAGAR, AK; PAN, R.; Naugle, Donald G.

1989-01-01T23:59:59.000Z

445

al-fe-ni apres des: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

1 Semiconductor Scintillator Engineering Websites Summary: Colloquium 13 Epitaxial detector enables 3D integration 0.5 mm 2 m n+ InP scintillator pin InGaAsP-ray (-ray)...

446

E-Print Network 3.0 - aluminum nickelide ni3al Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

been considered a viable material for templated growth... no investigation into how pore growth is affected by confining the pre-anodized aluminum dimensions... to the nanometer...

447

al-7si-ni con adiciones: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

on Climate Change) 12;Cambio climtico 12;Situacion con el Petroleo 12;12;Energia Renovable en PR Solar Eolica Biocombustibles Agua 12;EL PLANETA AZUL 12;EL AGUA EN LA...

448

Thermal and impact reaction initiation of mechanically activated Ni/Al reactive systems  

E-Print Network [OSTI]

, a quartz tube and a high-speed infrared thermography camera (FLIR SC6000 HS) to visualize the ignition

Mukasyan, Alexander

449

LASER SHOCK COMPRESSION AND SPALLING OF REACTIVE NI-AL LAMINATE COMPOSITES  

E-Print Network [OSTI]

] and facilitate the self-propagating high temperature synthesis (SHS). EXPERIMENTAL PROCEDURE The laminates were) were conducted to simulate the behavior of shock-wave propagation in the laminate structures. SEM to investigate the threshold conditions for dynamic mechanical reaction initiation caused by high intensity laser

Meyers, Marc A.

450

al72ni20co8 decagonal quasicrystal: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

range of decagonal tilings, many of which are chiral and have atomic surfaces with fractal boundaries. Two new families of decagonal tilings are presented; one is quarternary...

451

al89la6ni5 amorphous alloy: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Summary: alloy of composition correspond- ing to the metallic components of the superconduct- ing oxides respectivement. Abstract. - Previous quenching experiments on 2212...

452

D2O Adsorption on an Ultrathin Alumina Film on NiAl(110). | EMSL  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmospheric Optical Depth7-1D: Vegetation Proposed Newcatalyst phases onOrganization FY 2012 FYCustomer-Commentsloadvances fromD2O

453

Interface mixing of Al/Fe and Fe/Al bilayer systems and the role of Ti as a  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmospheric Optical Depth7-1D: Vegetation ProposedUsingFunInfrared Land SurfaceVirus-InfectedIntelligentCO2the ARMBatteries. |

454

La-doped BaTiO{sub 3} heterostructures: Compensating the polarization discontinuity  

SciTech Connect (OSTI)

We demonstrate a route to manipulate the polarization and internal electric field of a complex oxide heterostructure using a layering sequence based on the LaAlO{sub 3}-SrTiO{sub 3} interface. By combining sensitive atomic-level mapping of the structure using direct x-ray phase-retrieval methods with theoretical modeling of the electrostatic charge and polarization, we have devised a novel single-domain polar heterostructure. We find that ionic rearrangement results in strain and free energy minimization, and eliminates the polarization discontinuity leading to a two-fold increase of the spontaneous polarization towards the surface of an ultra-thin single-domain BaTiO{sub 3} film.

Kumah, D. P.; Clarke, R., E-mail: royc@umich.edu [Applied Physics Program, University of Michigan, Ann Arbor, Michigan 48109 (United States); Yacoby, Y. [Racah Institute of Physics, Hebrew University, Jerusalem 91904 (Israel); Pauli, S. A.; Willmott, P. R. [Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen PSI (Switzerland)

2013-12-01T23:59:59.000Z

455

ALS Workshop Highlights Diffraction-Limited Storage Ring Opportunities  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

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456

ALS Capabilities Reveal How Like Can Attract Like  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May JunDatastreamsmmcrcalgovInstrumentsrucLasDelivered‰PNGExperience4AJ01) (See95TI07)Operations During theALS Capabilities Reveal How

457

ALS Capabilities Reveal How Like Can Attract Like  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May JunDatastreamsmmcrcalgovInstrumentsrucLasDelivered‰PNGExperience4AJ01) (See95TI07)Operations During theALS Capabilities Reveal

458

ALS Capabilities Reveal How Like Can Attract Like  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May JunDatastreamsmmcrcalgovInstrumentsrucLasDelivered‰PNGExperience4AJ01) (See95TI07)Operations During theALS Capabilities RevealALSALS

459

ALS Capabilities Reveal How Like Can Attract Like  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May JunDatastreamsmmcrcalgovInstrumentsrucLasDelivered‰PNGExperience4AJ01) (See95TI07)Operations During theALS Capabilities

460

ALS Capabilities Reveal Multiple Functions of Ebola Virus  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May JunDatastreamsmmcrcalgovInstrumentsrucLasDelivered‰PNGExperience4AJ01) (See95TI07)Operations During theALS CapabilitiesALSALS

Note: This page contains sample records for the topic "ni ti al" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


461

ALS Capabilities Reveal Multiple Functions of Ebola Virus  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May JunDatastreamsmmcrcalgovInstrumentsrucLasDelivered‰PNGExperience4AJ01) (See95TI07)Operations During theALS CapabilitiesALSALSALS

462

ALS Capabilities Reveal Multiple Functions of Ebola Virus  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May JunDatastreamsmmcrcalgovInstrumentsrucLasDelivered‰PNGExperience4AJ01) (See95TI07)Operations During theALS CapabilitiesALSALSALSALS

463

ALS Technique Gives Novel View of Lithium Battery Dendrite Growth  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May JunDatastreamsmmcrcalgovInstrumentsrucLasDelivered‰PNGExperience4AJ01) (See95TI07)Operations DuringALSSpectrum Print Begun inALS

464

Fusion of radioactive $^{132}$Sn with $^{64}$Ni  

E-Print Network [OSTI]

Evaporation residue and fission cross sections of radioactive $^{132}$Sn on $^{64}$Ni were measured near the Coulomb barrier. A large sub-barrier fusion enhancement was observed. Coupled-channel calculations including inelastic excitation of the projectile and target, and neutron transfer are in good agreement with the measured fusion excitation function. When the change in nuclear size and shift in barrier height are accounted for, there is no extra fusion enhancement in $^{132}$Sn+$^{64}$Ni with respect to stable Sn+$^{64}$Ni. A systematic comparison of evaporation residue cross sections for the fusion of even $^{112-124}$Sn and $^{132}$Sn with $^{64}$Ni is presented.

J. F. Liang; D. Shapira; J. R. Beene; C. J. Gross; R. L. Varner; A. Galindo-Uribarri; J. Gomez del Campo; P. A. Hausladen; P. E. Mueller; D. W. Stracener; H. Amro; J. J. Kolata; J. D. Bierman; A. L. Caraley; K. L. Jones; Y. Larochelle; W. Loveland; D. Peterson

2007-04-05T23:59:59.000Z

465

Proton inelastic scattering on {sup 56}Ni in inverse kinematics  

SciTech Connect (OSTI)

Inelastic proton scattering to the first excited 2{sup +} state at 2.701 MeV in doubly magic {sup 56}Ni was studied at 101 MeV/u in inverse kinematics. The radioactive {sup 56}Ni ion beam was obtained from the SIS heavy ion synchrotron at GSI Darmstadt via fragmentation of a {sup 58}Ni beam, and separation by the fragment separator (FRS). A value B(E2, 0{sup +} {yields} 2{sup +}) = 600 {+-} 120 e{sup 2} fm{sup 4} was obtained which corresponds to a deformation parameter {beta} ({sup 56}Ni) = 0.173 {+-} 0.017.

Kraus, G.; Egelhof, P.; Fischer, C.; Geissel, H.; Himmler, A.; Nickel, F.; Muenzenberg, G.; Schwab, W.; Weiss, A. [GSI, Darmstadt (Germany); Chulkov, L.; Golovkov, M.; Ogloblin, A. [I.V. Kurchatov Inst., Moscow (Russian Federation); Friese, J.; Gillitzer, A.; Koerner, H.J.; Peter, M. [TU, Munich (Germany); Henning, W.; Schiffer, J.P. [Argonne National Lab., IL (United States); Kratz, J.V. [Univ. of Mainz (Germany)

1993-10-01T23:59:59.000Z

466

Structure, Magnetism and Conductivity in Epitaxial Ti-doped ...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Magnetism and Conductivity in Epitaxial Ti-doped -Fe2O3 Hematite: Experiment and density functional theory Structure, Magnetism and Conductivity in Epitaxial Ti-doped -Fe2O3...

467

Oxygen Vacancies and Ferromagnetism in CoxTi–x–y...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Vacancies and Ferromagnetism in CoxTi–x–y. Oxygen Vacancies and Ferromagnetism in CoxTi–x–y. Abstract: Abstract: Cobalt-doped titanium dioxide, or CTO, has...

468

Co-doped Anatase TiO? Heteroepitaxy on Si(001)  

SciTech Connect (OSTI)

Pure anatase TiO? and CoxTi?-x O? (0.01 < x < 0.04) epitaxial thin films were deposited by oxygen-plasma-assisted molecular beam epitaxy (OPA-MBE) on Si(001) for evaluation as a potential dilute magnetic semiconductor material suitable for Si-based spintronic devices. Epitaxial growth on Si(001) was facilitated by the deposition of Ľor ˝ ML Sr metal on the clean Si(001) surface to form an oxidation resistant silicide layer, followed by deposition of a thin SrTiO? buffer layer. Using ˝ ML Sr metal to form the silicide allowed the deposition of 10 ML SrTiO? without oxidation of the Si interface. Epitaxial anatase could be grown on this heterostructure, although use of the oxygen plasma during deposition resulted in significant SiO? formation. Pure anatase films consisted of epitaxial anatase surface particles on a continuous anatase film. For Co-doped films, Co segregation to surface particles of epitaxial anatase was observed by Auger electron spectroscopy and transmission electron microscopy (TEM); faceting of the particles was observed for low Co doping concentrations. Although no secondary phases containing Co were observed in Co-doped anatase films by x-ray diffraction or TEM, x-ray absorption near edge spectroscopy indicated Co was present in the films as a mixture of Co(0), Co(II), and Co(III). All samples were ferromagnetic at room temperature; for lower Co concentrations, the ferromagnetic remanence (9%) and coercive field (100 Oe) were similar to phase-pure Co:TiO? / LaAlO?. However, the presence of Co(0) under strongly oxidizing growth conditions known to oxidize the Si interface implies that under no deposition conditions can Co metal be eliminated while simultaneously protecting the Si interface from oxidation.

Kaspar, Tiffany C.; Droubay, Timothy C.; Wang, Chong M.; Heald, Steve M.; Lea, Alan S.; Chambers, Scott A.

2005-04-01T23:59:59.000Z

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assessment ni kansuru: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

cermets: microstructure and objectives Combustion synthesis, also called self-propagating high- temperature synthesis (SHS), is a method ). The introduction of TiCx...

470

abdomen agudo ni: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

cermets: microstructure and objectives Combustion synthesis, also called self-propagating high- temperature synthesis (SHS), is a method ). The introduction of TiCx...

471

ALS Evidence Confirms Combustion Theory  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

ALS Evidence Confirms Combustion Theory ALS Evidence Confirms Combustion Theory Print Wednesday, 2