Ti-50．75at％Ni形状记忆合金绞线超弹性试验研究

Pest and analysis on hyperelastic behavior of Ti-50.75at%Ni shape memory alloys strands

为了在常温条件下更充分地利用TiNi形状记忆合金绞线的超弹性性能，以Ti-50．75％（原子分数）Ni形状记忆合金（SMA）丝和绞线两种形式试件进行了室温条件下，加载速率、应变幅值及循环次数等因素对SMA丝和SMA绞线超弹性性能影响的试验。试验表明SMA以绞线的形式使用时能够大幅度提高其极限应变能力，相对SMA丝来说更适合应用于大变形时提供足够的恢复力；SMA绞线相对SMA丝具有更强大的超弹性性能；SMA绞线的残余应变量要比SMA丝的小得多，这也是使它具有较高的超弹性性能的主要因素之一．从而验证了SMA以绞线形式使用可以提供更强的超弹性性能．

In the normal temperature conditions, to make sufficient use of the hyperelastic character of strands made up of shape memory alloys, the experimentations on samples of SMA thread and strands which composition is Ti-50.75at%Ni were accomplished in room temperature. It is showed that, compared with the SMA thread, the capability of maximal strain of the SMA strands carry to a new and higher level, and the residual deformation is almost eliminated. Consequently, the hyperelastic character of SMA strands is better than SMA thread.