一定応力下におけるFeMnSi基形状記憶合金の形状回復特性

抄録

FeMnSi-based shape memory alloy (SMA) is expected to be utilized for pipe installations and large structural members. Since the shape recovery action in these applications must evolve under a stress, it is important to grasp the shape recovery behavior under a controlled stress. In this study, the shape recovery behavior of FeMnSi-based SMA under a constant stress is investigated in detail, and the interpretation based on the mechanism of stress-induced martensitic transformation, which controls the shape recovery action of FeMnSi based SMA, is conducted. The stress applied to oppose the reverse transformation decreases the degree of shape recovery and increases shape recovery temperature. On the other hands the stress applied to assist the reverse transformation increases the degree of shape recovery and decreases recovery temperature. The effect of the type and amount of prestrain on the shape recovery force is also studied. The degree of shape recovery and shape recovery force shown for FeMnSi-based SMA should be useful in designing pipe joints as well as structural members with knowledge of the results and the interpretation presented in this study.