胥冬琴,彭华备,刘刚,文玉华

• 1:四川大学材料成型及控制工程系

摘要(Abstract)：

采用OM、TEM和XRD方法研究了不同退火温度的热机械处理对Fe-14Mn-5Si-8Cr-4Ni合金中α′马氏体逆转变及合金形状记忆效应的影响。结果表明:当在773～1173 K之间退火时,Fe-14Mn-5Si-8Cr-4Ni合金的形状回复率随退火温度的升高先增加后降低,在923 K达到最大值88%;当退火温度低于923 K时,变形引入的α′马氏体仍大量残留在奥氏体基体中;当退火温度高于1073 K时,α′马氏体消失;热机械处理引入的α′马氏体能有效阻止再次变形过程中不同方向和不同区域应力诱发ε马氏体的交叉碰撞,使应力诱发马氏体以区域化的方式形成,进而显著提高合金的形状记忆效应。

关键词(KeyWords)： 形状记忆合金;热机械处理;α′马氏体;退火温度;区域化形成

Abstract:

Keywords:

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

作者(Author): 胥冬琴,彭华备,刘刚,文玉华

DOI: 10.13289/j.issn.1009-6264.2011.03.009

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