Abstract
This work describes the effect of heat treatment on temperature response and recovery stress of Ti-Ni-Cu shape memory alloy. The materials used in this study are Ti-41.7Ni-8.5Cu (at%) alloys which have different cold working ratio (10, 40% ). Heat treatment temperatures of wire specimen are varied from 623 K to 773 K. Heating-cooling tests after pre-strain ranged from 1% to 3% at the isothermal temperature of 263K, are carried out to investigate the thermomechanical behavior of Ti-Ni-Cu alloy. The temperature response is decreased with increasing pre-strain and decreasing heat treatment temperature. However, the recovery stress becomes larger with increasing pre-strain and decreasing heat treatment temperature. On the other hand, there is little effect of heat treatment temperature, cold working ratio and pre-strain on transformation temperature hysteresis.
