热机械训练影响TiNiCu记忆合金DSC曲线特征的研究

利用示差扫描量热法(DSC)研究了加热伸长、冷却收缩和加热收缩、冷却伸长2种TiNiCu双向记忆效应弹簧训练过程中相变特征。研究结果表明，训练前升温时，DSC曲线表现出吸热峰由多个小峰组成，随着训练次数的增加，峰的个数减少，具有稳定双向记忆效应的试样中，升温时只出现1个锐利的峰。这是因为在训练过程中引入特定取向的位错，产生一定的应力场，使得马氏体变体的取向比较一致，相变点基本相同所导致。并由于位错的引入，引起相变点As和Af下降。

Effect of Thermo-Mechanical Training on Characterization of DSC Curves of TiNiCu Shape Memory Alloys

Transformation characters of two kinds of TiNiCu two-way shape memory effect (TWSME) spring during excension and contraction training were investigated by DSC measurement during thermo-mechanical training. One of the TWSME spring could extend upon heating and contract upon cooling, the other could contract upon heating and extend upon cooling. The results showed that before training the profile of endothermic peaks were composed of several small peaks. With training the amount of the small peaks decreased. After the stabilized TWSME induced into the TiNiCu alloy, there was only one sharp peak appear. This can attribute to the dislocations structures creates an anisotropic stress field, which guides the orientation of martensite variants very similar. And the dislocations also leads to the decrease of As and Af.