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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.43  No.8 (2002)  >  pp.2165-2168

MATERIALS TRANSACTIONS
<<Previous article Vol.43  No.8 (2002)   pp.2165 - 2168 Next article>>

Hydrogen Pressure-Composition Isotherms for Ti45Zr38Ni17 Amorphous and Quasicrystal Powders Produced by Mechanical Alloying

Akito Takasaki1), Van T. Huett1) and Kenneth F. Kelton1)
1) Department of Physics, Washington University

Pressure-composition isotherms (PCTs) for amorphous and icosahedral (i) quasicrystal powders produced by mechanical alloying of Ti45Zr38Ni17 powder mixtures were measured at temperatures of 473 K and 523 K at low-hydrogen pressures, lower than 0.1 MPa. Sloping plateau-like features on PCTs were observed at equilibrium hydrogen pressures lower than 1 kPa, below an H/M (hydrogen to metal atom ratio)≈1.2 and ≈1 for the amorphous and i-phase powders respectively. The plateau-like region for the i-phase powder was steeper and narrower than that for the amorphous powder, implying some small differences between the local structures of the i-phase and the amorphous phase. After the PCT measurements, an increase in the nearest-neighbor atom spacing and an expansion of the quasilattice were observed for the amorphous and i-phase powders respectively. Impurities from some unsynthesized elemental material and a Ti2Ni type phase were also present. These also absorbed hydrogen, shown by an expansion of their crystal lattices. However, no crystal hydride formation was observed in any of the powders.


Keyword:
quasicrystal, amorphous, mechanical alloying, pressure-composition isotherm, hydrogen absorption, Ti2Ni phase, titanium-zirconium-nickel alloy

Received: May 17, 2002
Accepted: June 28, 2002 , Published online: September 06, 2005
Copyright (c) 2005 The Japan Institute of Metals

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