High-pressure hydrogen loading in Ti45Zr38Ni17 amorphous and quasicrystal powders synthesized by mechanical alloying

Akito Takasaki, K. F. Kelton

研究成果: Article

48 引用 (Scopus)

抄録

Amorphous and icosahedral phase (i-phase) powders, synthesized directly by mechanical alloying (MA) and after subsequent annealing, respectively, are hydrogenated at a temperature of 573 K and an initial pressure of 3.8 MPa. The i-phase powder contains a Ti2Ni-type phase (fcc structure, lattice parameter, a = 1.23 nm) as a minor phase. Hydrogen cycling for the i-phase powder decreases the coherence length and enhances the formation of an fcc hydride phase, namely (Ti, Zr)H2. The amorphous powder, which transforms to the fcc hydride after hydrogenation, is transformed primarily into a Ti2Ni-type crystal phase and a small amount of the i-phase after hydrogen desorption. Hydrogen cycling and mechanical alloying in a hydrogen gas atmosphere dramatically reduces the loading time of hydrogen for both the i-phase and the amorphous powders.

元の言語English
ページ(範囲)295-300
ページ数6
ジャーナルJournal of Alloys and Compounds
347
発行部数1-2
DOI
出版物ステータスPublished - 2002 12 16

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Quasicrystals
Mechanical alloying
Powders
Hydrogen
Hydrides
Phase structure
Hydrogenation
Lattice constants
Desorption
Gases
Annealing
Crystals
Temperature

ASJC Scopus subject areas

  • Metals and Alloys

これを引用

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T1 - High-pressure hydrogen loading in Ti45Zr38Ni17 amorphous and quasicrystal powders synthesized by mechanical alloying

AU - Takasaki, Akito

AU - Kelton, K. F.

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N2 - Amorphous and icosahedral phase (i-phase) powders, synthesized directly by mechanical alloying (MA) and after subsequent annealing, respectively, are hydrogenated at a temperature of 573 K and an initial pressure of 3.8 MPa. The i-phase powder contains a Ti2Ni-type phase (fcc structure, lattice parameter, a = 1.23 nm) as a minor phase. Hydrogen cycling for the i-phase powder decreases the coherence length and enhances the formation of an fcc hydride phase, namely (Ti, Zr)H2. The amorphous powder, which transforms to the fcc hydride after hydrogenation, is transformed primarily into a Ti2Ni-type crystal phase and a small amount of the i-phase after hydrogen desorption. Hydrogen cycling and mechanical alloying in a hydrogen gas atmosphere dramatically reduces the loading time of hydrogen for both the i-phase and the amorphous powders.

AB - Amorphous and icosahedral phase (i-phase) powders, synthesized directly by mechanical alloying (MA) and after subsequent annealing, respectively, are hydrogenated at a temperature of 573 K and an initial pressure of 3.8 MPa. The i-phase powder contains a Ti2Ni-type phase (fcc structure, lattice parameter, a = 1.23 nm) as a minor phase. Hydrogen cycling for the i-phase powder decreases the coherence length and enhances the formation of an fcc hydride phase, namely (Ti, Zr)H2. The amorphous powder, which transforms to the fcc hydride after hydrogenation, is transformed primarily into a Ti2Ni-type crystal phase and a small amount of the i-phase after hydrogen desorption. Hydrogen cycling and mechanical alloying in a hydrogen gas atmosphere dramatically reduces the loading time of hydrogen for both the i-phase and the amorphous powders.

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KW - Hydrogen absorbing materials

KW - Transition metal alloys

KW - X-ray diffraction

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