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

Akito Takasaki, K. F. Kelton

Research output: Contribution to journalArticle

48 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)295-300
Number of pages6
JournalJournal of Alloys and Compounds
Volume347
Issue number1-2
DOIs
Publication statusPublished - 2002 Dec 16

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

Keywords

  • Gas-solid reaction
  • Hydrogen absorbing materials
  • Transition metal alloys
  • X-ray diffraction

ASJC Scopus subject areas

  • Metals and Alloys

Cite this

High-pressure hydrogen loading in Ti45Zr38Ni17 amorphous and quasicrystal powders synthesized by mechanical alloying. / Takasaki, Akito; Kelton, K. F.

In: Journal of Alloys and Compounds, Vol. 347, No. 1-2, 16.12.2002, p. 295-300.

Research output: Contribution to journalArticle

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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.

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