抄録
In order to improve the performance of actuator using shape memory alloy, we studied the effects of aging-treatment on transformation temperature difference and temperature hysteresis of Ti-Ni-Cu shape memory alloy. The chemical composition of specimen is Ti-41.7Ni-8.5Cu (at%) and cold working ratio (CW) is 10% and 40%. Aging temperature is 673K, and aging time is varied from 3.6ks to 1800ks. In the case of CW=10%, the transformation temperatures have a little dependence on aging time. However, in the case of CW=40%, As and Mf increase with increasing of aging time. This difference is caused by the variation of dislocation density by aging and the difference of sensitivity to dislocation density of each transformation temperature. Moreover, the temperature response (Af -As) of CW=40% increases with increasing aging time.
