Hydrogen absorption in Ti45Zr35Ni17Cu3Ti45Zr35Ni17Cu3 amorphous and quasicrystalline alloy powders

Ti45Zr35Ni17Cu3Ti45Zr35Ni17Cu3 amorphous and icosahedral quasicrystalline (I-phase) powders were synthesized by mechanical alloying (MA) and subsequent annealing, the phase structure and hydrogen absorption properties of two powders were investigated. XRD analysis indicated that the MAed powder was an amorphous phase and annealed powder was an I-phase. Two alloy exhibited excellent hydrogen adsorption property and started to absorb hydrogen without induction time. PCT measurement showed that the plateau pressure of the amorphous powders was obviously higher than that of the I-phase powders. After the first hydrogen cycling, the partial amorphous phase changed to (Zr,Ti)H2(Zr,Ti)H2 phases, and the I-phase was steady. Similar hydride phases Ti2ZrH4Ti2ZrH4 and (Zr,Ti)H2(Zr,Ti)H2 were also formed after the second hydrogen cycling for the amorphous and I-phase alloy powders.