Abstract

Abstract Phase diagrams for representing complete equilibrium (CE) and para-equilibrium (PE) in ternary A-B-H systems are presented and discussed with special reference to the Ti-Cu-H system. Transitions from PE to CE resulting from hydriding-dehydriding cycles can be understood with the aid of the superimposed phase diagrams. Local equilibrium, which is an intermediate stage between CE and PE, gives rise to a new form of hysteresis, chemical hysteresis, in alloy-hydrogen systems. In these alloy systems chemical hysteresis will supplement plastic hysteresis, usually present in all low temperature transitions in metal-hydrogen systems.

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