李晓兰,胥冬琴,文玉华,彭华备,余勤旭

• 1:四川大学材料成型及控制工程系

摘要(Abstract)：

采用电阻法和OM等手段研究了不同温度区间的热循环对Fe-14Mn-5.5Si-8Cr-5Ni合金微观组织和形状记忆效应的影响。结果表明:298 K～353 K、520 K、773 K和77 K～773 K热循环1次后,合金形状回复率均大幅度提高;298～773 K循环5次后的形状回复率提高了26%,77～773 K热循环5次后的形状回复率提高了36%。热循环显著减少了因淬火热应力导致的热诱发ε马氏体量,并且热诱发ε马氏体的逆转变向基体引入了大量的堆垛层错。与固溶态相比,热循环后再变形不仅使α'马氏体的数量显著减少,而且应力诱发ε马氏体以区域化的方式形成,因而合金的形状记忆效应显著提高。77～773 K的热循环比298～773 K的热循环更能显著提高合金形状记忆效应的原因是由于其引入了更多的堆垛层错。

关键词(KeyWords)： 形状记忆合金;形状记忆效应;热循环;热诱发ε马氏体

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(50501015,50871072);; 四川省青年基金(2010A01-436)

作者(Author): 李晓兰,胥冬琴,文玉华,彭华备,余勤旭

DOI: 10.13289/j.issn.1009-6264.2012.08.005

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