TiNiCu形状记忆合金双向记忆效应研究  

Investigation on the two way shape memory effect in a TiNiCu shape memory alloy

作　　者：王治国[1] 祖小涛[1] 傅平[2] 戴晶怡[2] 封向东[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621900 [3]四川大学物理系,四川成都610064

出　　处：《功能材料》2003年第3期281-283,共3页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(10175042);中物院基金(99040536)

摘　　要：　研究了热机械训练温度及定型处理温度对TiNiCu形状记忆合金弹簧双向记忆效应的影响。研究结果表明:在纯马氏体状态进行训练时,双向记忆恢复率随训练次数的增加而增加,并在一定的训练次数后达到饱和;在纯奥氏体状态进行训练,双向记忆恢复率随训练次数迅速增加到某一最大值后随训练次数的增加而减小;在马氏体和奥氏体混合相进行训练时,双向记忆恢复率随训练次数先增加而后减小。经过400～550℃×1h/AC定型处理及热机械训练后最大形状记忆恢复率随定型处理温度升高先增大然后减小。由于马氏体再取向时引入的位错有利于双向记忆效应,热诱发和应力诱发的马氏体变体数量不同,引起了在不同状态训练诱发的双向记忆效应随训练次数变化的差异。The focus of this study is the influence of thermomechanical training on martensite, austenite and martensite+austenite and the influences of annealing and thermomechanical training on the two-way shape memory effect of TiNiCu alloys. The results showed that when the TiNiCu springs are thermomechanically trained at martensite. there is an increase of the recovery rate to a saturated value; when the TiNiCu springs are thermomechanically trained at austenite and martensite+austenite, there is an increase of the recovery rate to a maximum value and then it decreases with ongoing training. With increasing annealing temperature, the maximum recovery rate increases first then decreases. Dislocations generated by martensite reorientation are effective in developing two-way memory effect. The magnitude of thermo-induced or stress-induced martensite variants are different, so that the magnitude of the dislocations are different too. The recovery rate has different rule with increasing thermomechanical training cycles at different training temperature.

关 键 词：TINICU 形状记忆合金 双向记忆效应 弹簧 定型处理 热机械训练温度 

分 类 号：TG139.6[一般工业技术—材料科学与工程]