冷轧对NiTi记忆合金相变行为及记忆效应的影响  

Effect of Cold Rolling Reduction on the Phase Transformation Behavior and Recoverable Properties of NiTi Shape Memory Alloys

作　　者：于学勇[1] 任龙[1] 杨莉[1] 郭国林[1] 

机构地区：[1]常熟理工学院机械工程学院,江苏常熟215500

出　　处：《常熟理工学院学报》2015年第4期72-74,82,共4页Journal of Changshu Institute of Technology

摘　　要：通过低温DSC测试仪、金相显微镜和拉伸试验机,研究Ni Ti形状记忆合金冷轧变形量对马氏体相变行为和形状恢复率的影响.结果表明:冷轧变形生成的应力诱发马氏体和取向不同的丝织构及高密度位错,使得马氏体相变时界面迁移的阻碍作用增加,抑制了相变的发生;随冷轧变形量的增大合金的形状恢复率降低.This paper makes a research into NiTi shape memory alloy effects of cold deformation recovery rate on the martensitic transformation behavior and shape via the low temperature DSC tester, optical microscope and tensile testing machine. The results show that the stress generated by the cold rolled deformation induces martensite and orientation of different silk structures and high density of dislocations, enables the martensite phase transformation interface migration inhibition to increase, and inhibits the occurrence of phase transition. With the increase of cold rolling deformation, the alloy shape recovery rate is reduced.

关 键 词：镍钛形状记忆合金 相变 织构 形状恢复率 

分 类 号：TG139.6[一般工业技术—材料科学与工程]