Abstract
Ti–V–Mn based alloys, consisting mainly of the hexagonal C14 Laves and BCC phases, with nominal compositions of Ti0.5V0.4TM0.1Mn, where TM=Nb, Cr, Mo, Ta and Ti0.5V0.5−xNbxMn, where x=0.05 and 0.2, were synthesised by arc melting. It was found that small amounts of Nb substituted for V (x=0.05 and 0.1) resulted in smaller hysteresis between absorption and desorption as well as higher hydrogen dissociation pressures, compared to Ti0.5V0.5Mn. These findings show that Ti0.5–V0.45–Nb0.05–Mn is a suitable alloy to be used in a metal hydride compressor to deliver a pressure of 650bar in the temperature range 303–473K.
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