热机械训练影响TiNiCu记忆合金DSC曲线特征的研究  

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

作　　者：王治国[1] 祖小涛[1] 吴继红[1] 戴晶怡[2] 傅平[2] 杨树正[3] 

机构地区：[1]电子科技大学应用物理系,四川成都610054 [2]中国工程物理研究院电子工程研究所,四川绵阳621907 [3]四川师范学院物理系,四川南充637000

出　　处：《稀有金属材料与工程》2004年第10期1052-1055,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(10175042);中国工程物理研究院基金(99040536);四川省杰出青年基金资助课题

摘　　要：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。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.

关 键 词：TINICU形状记忆合金 热机械训练 双向记忆效应 DSC 

分 类 号：TG139.6[一般工业技术—材料科学与工程]