Effects of Quenching Temperature on Microstructure, Performance and Phase Transition Point of CuAlNi Shape Memory Alloy

A new CuAlNi shape memory alloy was prepared by adding Mn and B elements based on CuAlNi alloy, and then quenched at different temperatures to study the effects of quenching temperature on the microstructure, phase structure, hardness, resistivity as well as phase transition temperature. The results show that the microstructure of alloy after quenching at different temperatures was martensite with structure of M18R. As the temperature increased, the martensite laths became wider and straighter; but the hardness of alloy had no significant difference; the resistivity of as-quenched alloy decreased first, then increased, and reached minimum value at 700 ℃; the transition temperature decreased first, then increased, and reached maximum value at 800 ℃.