窄热滞Ti-Ni-Cu-Cr合金的马氏体相变和形状记忆行为  

Matensitic transformation and shape memory behaviors of Ti-Ni-Cu-Cr alloy with narrow temperature hysteresis

作　　者：贺志荣[1] 王芳[2] 杜雨青 HE Zhirong;WANG Fang;DU Yuqing(School of Materials Science and Engineering, Shaanxi University of Technology, Hanzhong 723001, China;Library, Shaanxi University of Technology, Hanzhong 723003, China)

机构地区：[1]陕西理工大学材料科学与工程学院,陕西汉中723001 [2]陕西理工大学图书馆,陕西汉中723003

出　　处：《功能材料》2022年第6期6191-6199,共9页Journal of Functional Materials

基　　金：国家重点研发计划项目(2016YFE0111400)。

摘　　要：为了开发性能稳定的窄热滞Ti-Ni基形状记忆合金,设计制作了Ti-45Ni-5Cu-0.3Cr(原子分数)形状记忆合金丝,用示差扫描热分析仪和微机控制电子万能试验机研究了退火态和时效态Ti-45Ni-5Cu-0.3Cr合金的马氏体相变和形状记忆行为,探讨了形变温度对该合金形状记忆行为的影响。结果表明,350~700℃/0.5 h退火态和300~600℃/1~50 h时效态Ti-45Ni-5Cu-0.3Cr合金冷却/加热时皆发生A→M/M→A(A-母相B2,CsCl型结构;M-马氏体B19′,单斜结构)一步马氏体可逆相变,马氏体相变温度比较稳定,在14~21℃之间变化;相变热滞较窄,在17~21℃之间变化。室温下,退火态和时效态Ti-45Ni-5Cu-0.3Cr合金皆呈形状记忆效应,且形状记忆行为稳定。随变形温度升高,Ti-45Ni-5Cu-0.3Cr合金的应力应变平台应力增加,残余应变减少,合金特性由形状记忆效应转变为超弹性,转变温度在50~60℃之间。In order to develop a Ti-Ni base shape memory alloy with narrow temperature hysteresis and stable properties,Ti-45Ni-5Cu-0.3Cr(atomic fraction)shape memory alloy wires were designed and manufactured.The matensitic transformation and shape memory behaviors of annealed and aged Ti-45Ni-5Cu-0.3Cr alloy were studied and the effect of the deformation temperature on the shape memory behaviors of the alloy was investigatied by differential scanning calorimeter and microcomputer-controlled electronic universal testing machine.It shows that the one-step reversible matensitic transformation of A→M/M→A(A-parent phase B2,CsCl;M-matensite B19′,monoclinic)occurs in the Ti-45Ni-5Cu-0.3Cr alloy annealed at 350-700℃for 0.5 h and aged at 300-600℃for 1-50 h upon cooling/heating.The martensitic transformation temperature is stable,and changes in the range of 14-21℃.The temperature hysteresis is narrow,and changes in the range of 17-21℃.At the room temperature,both annealed and aged Ti-45Ni-5Cu-0.3Cr alloys exhibit shape memory effect and the shape memory behavior is stable.With the increase of deformation temperature,the stress-strain plateau stress increases,the residual strain decreases,the alloy characteristics change from shape memory effect to superelasticity,and the transition temperature is between 50℃and 60℃in Ti-45Ni-5Cu-0.3Cr alloy.

关 键 词：Ti-45Ni-5Cu-0.3Cr合金 形状记忆合金 退火 时效 马氏体相变 形状记忆效应 

分 类 号：TG113.25[金属学及工艺—物理冶金]