The influence of parent phase chemistry on the marmem behaviour of Cu–Al–Ni and Cu–Zn–Al alloys has been studied. The essential differences in the nature of thermoelastic martensites in the two systems were observed metallographically and it was attempted to improve the imperfect shape recovery of Cu–Zn–Al alloys by thermal cycling. It was observed that both aluminium and nickel raised the recovery temperature of the alloys under investigation. The lattice invariant deformation mode in the Cu–Al–Ni system was found to be twinning, but in the Cu–Zn–Al system it was found to be stacking faults. Improved marmem behaviour of Cu–Zn–Al alloys was achieved by thermal cycling.
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