Characterization of copper-based shape memory alloy with zinc and aluminum

Copper-based shape memory alloy with zinc and aluminum was manufactured, plastically deformed, heat treated and characterized in terms of the physico-mechanical, structural and micro-structural investigation. Typical martensitic microstructure with twins is revealed by the optical and electron microscopy. The presence of marten site in the structure was further confirmed through an X-ray diffraction. Toughness and hardness of the alloy are investigated, too. Optimal properties are obtained for the condition of the alloy that was subjected to the heat treatment according to the following scheme: annealing at 8500C and 9000C (10 min) + quenched in water + aging at 4000C (1 hour) + air cooling.