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 language | English |
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Pages (from-to) | 2748-2752 |
Number of pages | 5 |
Journal | Materials Transactions |
Volume | 43 |
Issue number | 11 |
DOIs | |
Publication status | Published - 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