Effect of absorption-desorption cycles on structure and stability of protides in Ti-Cr-V alloys

Takashi Kazumi, Takuya Tamura, Atsunori Kamegawa, Hitoshi Takamura, Masuo Okada

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

Ti-Cr-V alloys with a BCC structure have high protium capacities, but it is known that the cyclic properties for the alloys change with varying V content. In this paper, the cyclic properties of the Ti-Cr-V alloys are investigated in view of the crystal structure of the β protide phase, which was measured at the point after desorbing at the plateau region and the thermal stability of the γ protide phase, which was measured at the point immediately before desorbing at the desorption region. It was found that the crystal structure of the β phase was changed from BCC phase to BCT phase and the c/a increased with increasing the cycle number. This difference of the crystal structure of the β phase suggests that the lattice can't gradually contract to a-axis direction at absorbing process with increasing the cycle number. Furthermore, it was found that the absorption-desorption cycle process causes the declined slope of the ΔH plots due to existence of the different γ protides of different thermal stabilities. Namely, this result suggests that site energies of protium in the lattice have a distribution after absorption-desorption cycles.

Original languageEnglish
Pages (from-to)2748-2752
Number of pages5
JournalMaterials Transactions
Volume43
Issue number11
DOIs
Publication statusPublished - 2002 Nov

Keywords

  • Body centered cubic
  • Body centered tetragonal
  • Hydrogen storage alloy
  • Slope of ΔH plots
  • Titanium-chromium-vanadium alloy
  • β protide phase
  • γ protide phase

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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