热机械循环方法对训练NiTi合金双程形状记忆效应的影响  

Influence of Thermomechanical Cyclic Methods on Training NiTi Alloy for Two-way Shape Memory Effect

作　　者：罗洪艳[1] 牟波[1] 廖彦剑[1] 侯文生[1] 杨军[1] 郑小林[1] 

机构地区：[1]重庆大学生物工程学院,重庆400044

出　　处：《材料导报》2009年第12期55-58,共4页Materials Reports

基　　金：重庆市自然科学基金(CTST2007BB5146;2007BB5165);重庆市"十一五"科技重大专项"新型医疗器械"(CSTC2008AA5010)

摘　　要：采用4种典型的热机械循环方法训练获取具有双程形状记忆效应的镍钛合金丝,从双程形状回复量、高温相形状、低温相形状和相变温度的变化等方面系统研究了训练方法对双程形状记忆效应训练效果的影响。结果表明,在不同训练方法中镍钛合金丝被加载应变时所处的物质相态的差异是造成不同训练效果的主要原因,其中在马氏体相变过程中因加载引入的位错最有利于双程形状记忆效应的形成。The influence of different training methods on producing two-way shape memory effect in NiTi alloy is investigated. Four typical thermornechanical cyclic methods are adopted to train NiTi wire to establish two-way shape memory effect and assessed in terms of two-way recoverable deformation, changes in the hot shape, cold shape and transformation temperatures. The results indicate that loading NiTi wire at different material phases is the main reason for different training effects obtained by these methods. In particular, the dislocations introduced by loading during the martensite transformation are the most advantageous to the formation of two-way shape memory effect.

关 键 词：NITI合金 热机械循环训练方法 双程形状记忆效应 

分 类 号：TG139.6[一般工业技术—材料科学与工程]