退火温度对Ti-51.1Ni形状记忆合金超弹性的影响  

Effect of annealing temperature on superelasticity of Ti-51. 1Ni shape memory alloy

作　　者：冯辉[1] 贺志荣[1] 王芳[2] 刘康凯[1] 杜雨青 Feng Hui;He Zhirong;Wang Fang;Liu Kangkai;Du Yuqing(School of Materials Science and Engineering, Shaanxi University of Technology, Hanzhong Shaanxi 723001,China;Library, Shaanxi University of Technology, Hanzhong Shaanxi 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：《金属热处理》2019年第3期120-123,共4页Heat Treatment of Metals

基　　金：国家重点研发计划(2016YFE0111400);汉中市科技计划(HZGXW1602);陕西理工大学研究生创新基金(SLGYCX1830)

摘　　要：用拉伸试验研究了退火温度(T_a)对Ti-51. 1Ni形状记忆合金超弹性的影响。结果表明:随T_a升高,Ti-51. 1Ni合金的应力诱发马氏体相变临界应力σ_M先降低后升高,极小值550 MPa在400℃退火后取得,极大值660 MPa在600℃退火后取得; 350～700℃退火态Ti-51. 1Ni合金的超弹性残余应变ε_r均较小(0. 27%～0. 36%);随应力-应变循环次数增加,350～700℃退火态Ti-51. 1Ni合金保持超弹性,应力应变滞后回线面积和ε_r减小,超弹性及其稳定性提高;要使该合金获得优异、稳定的超弹性,应对其进行500～600℃退火处理和应力-应变循环试验。Effect of annealing temperature(Ta) on the superelasticity of Ti-51. 1 Ni shape memory alloy was investigated by tensile test. The results show that with increase of Ta,the critical stress of stress-induced martensitic transformation σM decreases firstly and then increases,the minimum of 550 MPa can be obtained when the alloy is annealed at 400 ℃,the maximum of 660 MPa can be obtained when the alloy is annealed at 600 ℃. The superelasticity residual strain εr of the Ti-51. 1 Ni alloy annealed at 350-700 ℃ is very small( 0. 27%~ 0. 36%).With the increase of stress-strain cycling number,the Ti-51. 1 Ni alloy annealed at 350-700 ℃ keeps superelasticity,the hysteresis loop area of stress-strain cycles and εr decrease,and the superelasticity and its stability increase. In order to obtain excellent and stable superelasticity in the Ti-51. 1 Ni alloy,the annealing treatment at 500-600 ℃ and the stress-strain cycling test should be carried out for the alloy.

关 键 词：Ti-51.1Ni形状记忆合金 退火 超弹性 应力诱发马氏体相变 超弹性残余应变 

分 类 号：TG113.25[金属学及工艺—物理冶金]