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

Akito Takasaki, K. F. Kelton

Research output: Contribution to journalArticle

49 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

Keywords

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

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Fingerprint Dive into the research topics of 'High-pressure hydrogen loading in Ti<sub>45</sub>Zr<sub>38</sub>Ni<sub>17</sub> amorphous and quasicrystal powders synthesized by mechanical alloying'. Together they form a unique fingerprint.

  • Cite this