纳米晶NiTiFe形状记忆合金的超弹稳定性  

Superelastic stability of nanocrystalline NiTiFe shape memory alloy

作　　者：王涛涛 郭方敏[2] 贺志荣[1] 艾桃桃[1] 叶俊杰 邹祥宇[1] 唐玲[1] 刘艳[1] WANG Tao-tao;GUO Fang-min;HE Zhi-rong;AI Tao-tao;YE Jun-jie;ZOU Xiang-yu;TANG Ling;LIU Yan(School of Materials Science and Engineering,Shaanxi University of Technology,Hanzhong 723001,China;Department of Materials Science and Engineering,China University of Petroleum Beijing,Beijing 102249,China;Xi’an Saitesimai Titanium Industry Co Ltd,Xi’an 710200,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]中国石油大学(北京)新能源与材料学院,北京102249 [3]西安赛特思迈钛业有限公司,陕西西安710200

出　　处：《材料热处理学报》2022年第12期65-72,共8页Transactions of Materials and Heat Treatment

基　　金：陕西理工大学人才启动科研基金资助项目(SLGRCQD2107)。

摘　　要：传统NiTiFe形状记忆合金因低的屈服强度而显著降低其马氏体相变的超弹稳定性,本文通过大变形冷拔和低温退火制备了不同尺寸纳米晶Ni47Ti50Fe3(at%)合金丝材,在不同温度下,通过应变量为6%的10次拉伸循环实验研究了纳米晶NiTiFe合金力致B19′相变超弹稳定性与晶粒尺寸和变形温度的关系。结果表明:不同尺寸纳米晶NiTiFe合金在不同温度下循环变形后的残余变形均随循环变形次数的增加而增大;循环拉伸后的残余应变随晶粒尺寸的减小而减小,呈现晶粒尺寸依赖性;循环拉伸后的残余应变随变形温度的降低而减小,呈现温度依赖性。Because of the low yield strength of traditional NiTiFe shape memory alloys, its superelastic stability of martensitic transformation is significantly reduced. In this paper, nanocrystalline Ni47 Ti50 Fe3(at%) alloy wires with different grain sizes were prepared by large deformation cold drawing and low-temperature annealing. The relationship between the superelastic stability of stress-induced B19′ martensitic transformation of the nanocrystalline NiTiFe alloy and the grain size and deformation temperature was studied by ten tensile cycles at different temperatures with a strain of 6%. The results show that the residual strain of the nanocrystalline NiTiFe alloy with different grain sizes after cyclic deformation at different temperatures increases with the increase of the number of tensile cycles. The residual strain after tensile cycles decreases with the decrease of grain size, showing a grain size dependence. The residual strain after tensile cycles decreases with the decrease of deformation temperature, showing a temperature dependence.

关 键 词：NiTiFe形状记忆合金 纳米晶 超弹性 温度依赖性 

分 类 号：TG139.6[一般工业技术—材料科学与工程]