Ni53.2Mn22.6Ga24.2单晶的两步热弹性马氏体相变及其应力应变特性  

Two-step thermoelastic martensitic transformation and stress-strain characteristic of Ni_(53.2)Mn_(22.6)Ga_(24.2) single crystal

作　　者：崔玉亭[1,2] 游素琴[1] 武亮[1] 马勇[1] 陈京兰[3] 潘复生[2] 吴光恒[3] 

机构地区：[1]重庆师范大学物理与信息技术学院,重庆400047 [2]重庆大学材料科学与工程学院,重庆400044 [3]中国科学院物理研究所北京凝聚态物理国家实验室,北京100080

出　　处：《物理学报》2009年第12期8596-8601,共6页Acta Physica Sinica

基　　金：教育部科学技术研究计划重点项目(批准号:207096);中国博士后科学基金(批准号:20060400197);重庆市科技攻关计划(批准号:CSTC2008AC4011)资助的课题~~

摘　　要：对具有两步完全热弹性的Ni53.2Mn22.6Ga24.2单晶的物性采用多种测量手段进行了表征,特别研究了不同温度下的应力-应变特性.研究表明,热诱发的中间马氏体相变应变远大于马氏体相变应变.在较低的形变温度下,沿单晶母相[001]方向的压应力诱发的是两步马氏体相变,材料表现出赝弹性;在较高的形变温度下,只能观察到一步马氏体相变,材料展现出完全超弹性特性.此外,利用热力学理论分别计算了诱发马氏体相变和中间马氏体相变的临界应力与形变温度的关系,与实验测量得到的结果相符.Physical properties of the two-step complete thermoelastic Ni53.2Mn22.6Ga24.2 single crystal are investigated by various measuring methods,especially,the stress-strain characteristic at different temperatures is studied. The results show that at low deformation temperatures the pressing stress along the [001] direction of the parent phase would induce a two-step martensitic transformation,and the alloy exhibits pseudoelastic characteristics. But at relatively high temperatures,the alloy exhibits complete superelastic characteristics,and only one-step martensitic transformation is observed. Furthermore,the dependence of critical stress on the deformation temperature for the martensitic transformation and intermartensitic transformation is calculated by the thermodynamic theory,and the result is consistent with that of two-step martensitic transformation obtained by experiment.

关 键 词：马氏体相变 形状记忆效应 应变 超弹性 

分 类 号：TG139.6[一般工业技术—材料科学与工程]