预应变对Fe-Mn-Si记忆合金中应力诱发εM形态的影响  

Effect of Pre-strain on Morphology of Stress Induced ε Martensite in an Fe-Mn-Si Shape Memory Alloy

作　　者：乔志霞[1] 刘永长[2] 王江宏[1] 孟毅[1] 王东爱[1] 

机构地区：[1]天津商业大学机械工程学院,天津300134 [2]天津大学材料科学与工程学院,天津300072

出　　处：《材料科学与工程学报》2008年第1期46-48,52,共4页Journal of Materials Science and Engineering

基　　金：国家自然科学基金资助项目(50401003);天津市自然科学基金资助项目(033608811)

摘　　要：利用拉伸试验方法测定了Fe-25%Mn-4.5%Si-1%Cr-2%Ni合金预应变对可恢复应变量的影响,并用X射线衍射分析方法考察了应力诱发ε马氏体(εM)体积分数随预应变量的变化关系。结果表明,当预应变大于5%而小于8%时,尽管应力诱发ε马氏体量仍然随预应变的增大而增多,而可恢复应变量却在预应变超过5%后随之迅速降低。利用透射电子显微镜对不同变形量试样中应力诱发εM形貌进行观察得知,预应变量由小及大,诱发出的εM形态变化很大,从而对记忆效应产生不同的影响。The effect of pre-strain on shape recovery strain in an Fe-25 % Mn-4.5 % Si-1% Cr-2 % Ni shape memory alloy was investigated by tensile testing, and at the same time the relationship between the amount of stress induced ε martensite （εM） and pre-strain was determined by X-ray diffraction analysis. It was shown that the shape recovery strain decreases rapidly with increasing pre-strain when the deformation is above 5%, although the amount of stress induced εM still increases with increasing pre-strain in the range of 5% to 8%. Transmission electron microscope （TEM） observation on the stress induced εM in specimens of different pre-strain showed that morphology of εM changes greatly with different pre-strain, which would have great influence on the shape memory effect in the alloy.

关 键 词：FE-MN-SI形状记忆合金 预应变量 透射电镜 应力诱发εM 

分 类 号：TG139.6[一般工业技术—材料科学与工程]