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 language | English |
|---|---|
| Pages (from-to) | 457-460 |
| Number of pages | 4 |
| Journal | Journal of Non-Crystalline Solids |
| Volume | 334-335 |
| DOIs | |
| Publication status | Published - 2004 Mar 15 |
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ASJC Scopus subject areas
- Ceramics and Composites
- Electronic, Optical and Magnetic Materials
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Hydrogenation of Ti-Zr-Ni quasicrystals synthesized by mechanical alloying. / Takasaki, Akito; Huett, V. T.; Kelton, K. F.
In: Journal of Non-Crystalline Solids, Vol. 334-335, 15.03.2004, p. 457-460.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Hydrogenation of Ti-Zr-Ni quasicrystals synthesized by mechanical alloying
AU - Takasaki, Akito
AU - Huett, V. T.
AU - Kelton, K. F.
PY - 2004/3/15
Y1 - 2004/3/15
N2 - 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.
AB - 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.
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U2 - 10.1016/j.jnoncrysol.2003.12.023
DO - 10.1016/j.jnoncrysol.2003.12.023
M3 - Article
VL - 334-335
SP - 457
EP - 460
JO - Journal of Non-Crystalline Solids
JF - Journal of Non-Crystalline Solids
SN - 0022-3093
ER -