Hydrogenation of Ti-Zr-Ni quasicrystals synthesized by mechanical alloying

Akito Takasaki, V. T. Huett, K. F. Kelton

Research output: Contribution to journalConference article

32 Citations (Scopus)

Abstract

Mechanical alloying of a Ti45Zr38Ni17 powder mixture formed an amorphous phase, but subsequent annealing caused the formation of an icosahedral (i) quasicrystal phase with a small amount of the Ti2Ni-type crystal phase. After high-pressure hydrogenation at 573 K at a hydrogen pressure of 3.8 MPa, the amorphous phase transformed to a TiH 2-type hydride, while the i-phase was structurally stable even after the hydrogenation. The maximum hydrogen concentration for the high-pressure hydrogenation was the same (hydrogen-to-metal atom ratio ≈1.5) for the i-phase and amorphous powders, suggesting structural similarities between the i-phase and the amorphous phase. Pressure-composition isotherms (PCTs), measured under low-pressure hydrogenation at a temperature of 423 K, showed sloping plateau-like features at equilibrium hydrogen pressures lower than 1 kPa for both the i-phase and amorphous powders. The plateau-like region for the i-phase powder was steeper and narrower than that for the amorphous powder, indicating a slight difference in site energy distribution of hydrogen in the i-phase and the amorphous phase.

Original languageEnglish
Pages (from-to)457-460
Number of pages4
JournalJournal of Non-Crystalline Solids
Volume334-335
DOIs
Publication statusPublished - 2004 Mar 15
Event8th International Conference on Quasicrystals - Bangalore, India
Duration: 2002 Sep 82002 Sep 13

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Materials Chemistry

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