skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Amorphization and crystallization processes of the ball-milled Al-Y-Fe-TM alloys (TM=Ni, Co, Cu, and Fe) (Prop. 2003-037)

Abstract

High-energy ball milling was used to synthesize aluminum-based alloys containing amorphous and nanocrystalline phases to investigate the compositional effects of transition metals (TM) on the amorphization and crystallization processes of the ball-milled Al{sub 85}Y{sub 7}Fe{sub 5}TM{sub 3} alloys (TM = Ni, Co, Cu, and Fe) were investigated. The crystallization kinetics of the ball-milled Al-Y-Fe-TM nanocomposite powders were studied using differential scanning calorimetry (DSC). The DSC results of Al{sub 83}Y{sub 7}Fe{sub 5}Ni{sub 5} show that the crystallization temperature and the activation energy of crystallization are 668 K and 310 kJ/mol, respectively. In-situ high-temperature X-ray diffraction showed that the crystallization was a complex process involving growth of the nanocrystalline phase along with crystallization of the amorphous matrix phase.

Authors:
 [1];  [2];  [2];  [2];  [1];  [1]
  1. University of Tennessee, Knoxville (UTK)
  2. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); High Temperature Materials Laboratory
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
931612
DOE Contract Number:
DE-AC05-00OR22725
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Non-Crystalline Solids; Journal Volume: 352; Journal Issue: 38-39
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; MILLING; ALUMINIUM BASE ALLOYS; AMORPHOUS STATE; CRYSTALLIZATION; YTTRIUM ALLOYS; IRON ALLOYS; NICKEL ALLOYS; COBALT ALLOYS; COPPER ALLOYS; ACTIVATION ENERGY

Citation Formats

Wilson, Timothy W., Choo, Hahn, Porter, Wallace D, Speakman, Scott A, Fan, Chang, and Liaw, Peter K. Amorphization and crystallization processes of the ball-milled Al-Y-Fe-TM alloys (TM=Ni, Co, Cu, and Fe) (Prop. 2003-037). United States: N. p., 2006. Web. doi:10.1016/j.jnoncrysol.2006.07.004.
Wilson, Timothy W., Choo, Hahn, Porter, Wallace D, Speakman, Scott A, Fan, Chang, & Liaw, Peter K. Amorphization and crystallization processes of the ball-milled Al-Y-Fe-TM alloys (TM=Ni, Co, Cu, and Fe) (Prop. 2003-037). United States. doi:10.1016/j.jnoncrysol.2006.07.004.
Wilson, Timothy W., Choo, Hahn, Porter, Wallace D, Speakman, Scott A, Fan, Chang, and Liaw, Peter K. Sun . "Amorphization and crystallization processes of the ball-milled Al-Y-Fe-TM alloys (TM=Ni, Co, Cu, and Fe) (Prop. 2003-037)". United States. doi:10.1016/j.jnoncrysol.2006.07.004.
@article{osti_931612,
title = {Amorphization and crystallization processes of the ball-milled Al-Y-Fe-TM alloys (TM=Ni, Co, Cu, and Fe) (Prop. 2003-037)},
author = {Wilson, Timothy W. and Choo, Hahn and Porter, Wallace D and Speakman, Scott A and Fan, Chang and Liaw, Peter K},
abstractNote = {High-energy ball milling was used to synthesize aluminum-based alloys containing amorphous and nanocrystalline phases to investigate the compositional effects of transition metals (TM) on the amorphization and crystallization processes of the ball-milled Al{sub 85}Y{sub 7}Fe{sub 5}TM{sub 3} alloys (TM = Ni, Co, Cu, and Fe) were investigated. The crystallization kinetics of the ball-milled Al-Y-Fe-TM nanocomposite powders were studied using differential scanning calorimetry (DSC). The DSC results of Al{sub 83}Y{sub 7}Fe{sub 5}Ni{sub 5} show that the crystallization temperature and the activation energy of crystallization are 668 K and 310 kJ/mol, respectively. In-situ high-temperature X-ray diffraction showed that the crystallization was a complex process involving growth of the nanocrystalline phase along with crystallization of the amorphous matrix phase.},
doi = {10.1016/j.jnoncrysol.2006.07.004},
journal = {Journal of Non-Crystalline Solids},
number = 38-39,
volume = 352,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2006},
month = {Sun Jan 01 00:00:00 EST 2006}
}
  • Thick films of the Ni{sub 11}Co{sub 11}Fe{sub 66}Zr{sub 7}B{sub 4}Cu composition were synthesized via screen printing of the ball-milled ribbons of the above composition for possible use as planar inductors. The ribbons were obtained by rapid solidification. The resulting ribbon samples were annealed at 300 deg. C for 2 h to cause embrittlement. They were found to have soft magnetic properties (4{pi}M{sub s}{approx}13 kG, {delta}H{approx}100 Oe, and H{sub c}<0.5 Oe). The brittle ribbons were ball milled using tungsten carbide vials and stainless steel balls in an inert atmosphere for various milling times. The sample milled for 10 h was foundmore » to have a 4{pi}M{sub s} of about 13 kG and a coercivity of about 73 Oe with an average particle size of about 5 {mu}m. The screen printed (as prepared and aligned) samples showed a linewidth ({delta}H) of about 1000 Oe. Similar values were obtained for screen printed films annealed for 1 h at 200 and 400 deg. C.« less
  • Amorphous Mg{sub 2}Ni alloy was prepared by high energy ball-milling starting with polycrystalline Mg{sub 2}Ni which was prepared with the help of a metallurgy method by using a SPEX 8000D mill. The microstructural and phase structure characterization of the prepared materials was performed via scanning electron microscopy, transition electron microscope and X-ray diffraction. The thermal stabilities were investigated by differential scanning calorimetry. The apparent activation energies were determined by means of the Kissinger method. The first and second crystallization reactions take place at ∼ 255 °C and ∼ 410 °C, and the corresponding activation energy of crystallization is E{sub a1}more » = 276.9 and E{sub a2} = 382.4 kJ/mol, respectively. At 3 MPa hydrogen pressure and 250 °C, the hydrogen absorption capacities of crystalline, partially and fully amorphous Mg{sub 2}Ni alloy are 2.0 wt.%, 3.2 wt.% and 3.5 wt.% within 30 min, respectively. - Graphical Abstract: We mainly focus on the amorphization behavior of crystalline Mg{sub 2}Ni alloy in the high energy ball-milling process and the crystallization behavior of the amorphous Mg{sub 2}Ni alloy in a follow-up heating process. The relationship of milling, microstructure and hydrogenation properties is established and explained by models. - Highlights: • Amorphous Mg{sub 2}Ni has been obtained by high energy ball milling the as-cast alloy. • The amorphization behavior of polycrystalline Mg{sub 2}Ni is presented. • The crystallization behavior of the amorphous Mg{sub 2}Ni alloy is illustrated. • Establish the relationship of milling, microstructure and hydrogenation properties.« less
  • Nanocrystalline Fe{sub {ital x}}Cu{sub 100{minus}{ital x}} solid solutions ({ital x}{lt}60) with single-phase fcc structure have been prepared by mechanical alloying. The average grain size of the powders (6--20 nm) depends on the composition of the material. Varying the composition changes the grain size reversibly. This can be explained by the underlying mechanism of plastic deformation and solution hardening during mechanical alloying coupled with the recovery behavior of the material.
  • We report the effect of decrease in the grain size on the structural, magnetic and exchange bias (EB) behavior in ball milled Ni{sub 50-x}Co{sub x}Mn{sub 38}Sb{sub 12} (x=0 and 5) Heusler alloys. The existence of a wide range of grain sizes in the ball milled samples results in dramatic changes in the structural and magnetic properties. For x=0, a large EB field of 3.2 kOe is observed in the ball milled sample, compared to a value of 245 Oe of the bulk sample. This increase is attributed to the enhanced exchange coupling between the soft and hard magnetic particles.
  • Electrical and Hall resistivity studies have been carried out on a newclass of melt-spun, Al-/ital T/-/ital R/, Al-rich (above 75 at. %) ternaryamorphous alloys in order to study the possible correlation between theirelectronic and enhanced mechanical properties. We find for all these alloys(over 26 of them) the room-temperature Hall coefficient has a /ital negative/sign and increases significantly in magnitude with the (/ital T/-/ital R/)content, which indicates a decrease in the effective carrier concentration.This is consistent with the suggestion that the observed remarkable mechanicalproperties in these alloys are due to the enhanced strength of the additionallocal Al-/ital T/ and AL-/ital R/more » bonds. In these alloys the electricalresistivity at room temperature increases from about 65 ..mu cap omega.. cm for thebinary Al/sub 90/(/ital R/)/sub 10/ amorphous alloys to over 250..mu cap omega.. cm on further substitution of Al with less than 15 at. % of/ital T/ elements. From a systematic study the importance of /ital s/-/ital d/scattering mechanism and a crossover in the electronic properties from /ital s/-to /ital d/-band amorphous metal with /ital T/ substitution are discussed.« less