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

Title: Sharp volumetric billboard based characterization and modeling of complex 3D Ni/Al high energy ball milled composites

; ;
Publication Date:
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
Grant/Contract Number:
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Mechanics of Materials
Additional Journal Information:
Journal Volume: 108; Journal Issue: C; Related Information: CHORUS Timestamp: 2017-12-18 09:08:59; Journal ID: ISSN 0167-6636
Country of Publication:

Citation Formats

Yushu, Dewen, Lee, Sangmin, and Matouš, Karel. Sharp volumetric billboard based characterization and modeling of complex 3D Ni/Al high energy ball milled composites. Netherlands: N. p., 2017. Web. doi:10.1016/j.mechmat.2017.02.008.
Yushu, Dewen, Lee, Sangmin, & Matouš, Karel. Sharp volumetric billboard based characterization and modeling of complex 3D Ni/Al high energy ball milled composites. Netherlands. doi:10.1016/j.mechmat.2017.02.008.
Yushu, Dewen, Lee, Sangmin, and Matouš, Karel. Mon . "Sharp volumetric billboard based characterization and modeling of complex 3D Ni/Al high energy ball milled composites". Netherlands. doi:10.1016/j.mechmat.2017.02.008.
title = {Sharp volumetric billboard based characterization and modeling of complex 3D Ni/Al high energy ball milled composites},
author = {Yushu, Dewen and Lee, Sangmin and Matouš, Karel},
abstractNote = {},
doi = {10.1016/j.mechmat.2017.02.008},
journal = {Mechanics of Materials},
number = C,
volume = 108,
place = {Netherlands},
year = {Mon May 01 00:00:00 EDT 2017},
month = {Mon May 01 00:00:00 EDT 2017}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.mechmat.2017.02.008

Save / Share:
  • 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
  • Because of their low density, relatively high melting point, high elevated temperature strength and excellent oxidation resistance, Al{sub 3}Ti intermetallic is a good candidate to be exploited as the structural material for elevated temperature purpose. In this article, the structures and constituents of a quaternary alloy based on Al{sub 67}Mn{sub 8}Ti{sub 25} with 2 at% Nb addition prepared by melt-spinning and high-energy ball milling have been studied. The authors found that adding certain amounts of Nb into the single phase L1{sub 2}Al{sub 67}Ti{sub 25}Mn{sub 8} alloy can form a new type of Al{sub 3}Ti-based alloy, which has the L1{sub 2}more » matrix and DO{sub 22}Al{sub 3}(Ti,Nb) second phase in the cast state. Rapid solidification by melt spinning of this alloy is not effective for microstructural control. It is also composed of L1{sub 2} matrix with the DO{sub 22} phase precipitated along the grain boundaries at the free side of the ribbon. In the case of high-energy ball milling, the second phase dissolves into the matrix, accompanying with the disordering of the L1{sub 2} structure. When the milling time reaches 13 h, the structure is completely disordered, forming a FCC solid solution. By further milling to 30 h, the powder is purely amorphous.« less
  • Although it has been shown that the hydrogen storage kinetics of metal hydrides can be significantly improved by the addition of transition metal-based catalysts, relatively little attention has been paid to the impact that the form in which these catalysts are introduced during synthesis has on the resulting structure and how this alters performance. Two mixtures of MgH 2 doped with Ni were prepared via high-energy ball-milling under identical conditions, one using a pure Ni nanopowder catalyst and the other using anhydrous NiCl 2. The resulting Ni catalyst particles of the NiCl 2-doped material were 10-100 times smaller, as wellmore » as more uniform in size and shape. Electron tomography revealed that the additive form also altered its incorporation and 3D spatial distribution, with Ni particles limited to the outer surface in the NiCl 2-doped case. The significantly lower desorption performance measured in the NiCl 2-doped material is attributed to regions of MgCl 2 acting as barriers between the MgH 2 and Ni, hindering the ability of the latter to effectively catalyze the reactions. Finally, this work demonstrates the hazards in assuming different catalyst forms produce similar final structures and highlights the potential of catalyst form as a synthesis tool for optimizing the material structure and performance.« less
  • 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 amore » complex process involving growth of the nanocrystalline phase along with crystallization of the amorphous matrix phase.« less