大变形量对Fe-Mn-Si-Cr-Ni形状记忆合金微观组织和转变温度的影响  

Influence of Deformation on Microstructure and Transformation Temperature of Shape Memory Alloy Fe-Mn-Si-Cr-Ni

作　　者：于学勇[1] 华征潇[1] 潘毅[1] 程凤军[2] 李宁[2] 

机构地区：[1]常熟理工学院机电系,江苏常熟215500 [2]四川大学制造学院,四川成都610065

出　　处：《热加工工艺》2006年第20期64-66,共3页Hot Working Technology

摘　　要：通过Fe-Mn-Si-Cr-Ni和Fe-Mn-Si-Cr-Ni-Co合金变形量的大小和形变的类型来研究马氏体的转变特征。形变类型及变形量为:冷轧(变形量为17%和28%);拉丝(最后一道拉丝应变量为18%)。并通过热膨胀法测量合金相转变起始温度和转变终了温度,合金的相组成和微观结构特征通过XRD、SEM和AFM观察。结果表明,冷变形过程会导致应力诱发ε、α'马氏体的形成,甚至使热马氏体的Ms温度低于室温,并研究了230℃以上高温时,马氏体逆转变的温度特征。The characteristics of the martensitic transformation in a Fe-Mn-Si-Cr-Ni alloy and Fe-Mn-Si-Cr-Ni-Co alloy were investigated in terms of the amount and type of deformation,which is cold rolling （with 17% and 28% reduction of area）, and wire drawing （with 18% reduction of area in the last pass）. The temperature of start and finish of the phase transformations was measured by dilatometry. The constitution and microstructure of the alloy was characterized by XRD, SEM and AFM. The results show that the cold forming processes can lead to the formation of e and of martensites, even the start temperature of thermal martensite is helow room temperature. The characteristic temperature of the reverse transformation of martensite above 230 ℃ was also studied.

关 键 词：形状记忆合金 马氏体转变 形变 热膨胀 

分 类 号：TG115.213[金属学及工艺—物理冶金] TG225.25[金属学及工艺—金属学]