加载应变及速率对NiTi记忆合金超弹性的影响  

Effect of Strain and Loading Rate on the Mechanical Response of NiTi Shape Memory Alloy

作　　者：姜江[1] 陆德平[1] 陆磊[1] 谢仕芳[1] 姜大强[2] 郝世杰[2] 蒋小华[2] 

机构地区：[1]江西省科学院江西省铜钨新材料重点实验室,南昌330029 [2]中国石油大学(北京)材料科学与工程学院,北京102249

出　　处：《江西科学》2018年第1期21-25,共5页Jiangxi Science

基　　金：国家青年自然科学基金项目(51401240;51471187;51401096);江西省科学院普惠制项目(2013-XTPH1-33);江西省青年科学基金资助项目(20171ACB21068);江西省重点研发计划项目(20171BBH80009)

摘　　要：NiTi形状记忆合金具有诸多功能特性,如超弹性、高阻尼性和形状记忆效应等,因而得到广泛应用。然而,以往关于超弹性的研究多关注于循环稳定后记忆合金的力学响应,而针对循环稳定前力学响应及由之引发的新特性研究较少。着重研究记忆合金在前几次加卸载过程中,拉伸应变及速率对应力-应变相应的影响,并观察到一些未见报道的变化规律。NiTi shape memory alloys exhibit shape memory effect, superelasticity and high dampingdue to reversible thermoelastic martensitic transformation, and thus have assumed tremendous importance in the fields of science and engineering. Previous study on superelasticity focus on the stablemechanical response of a NiTi shape memory alloy after cycling training. However, some new response and new performance will occur before the tensile cycling training, which is usually ignored inmost provious researches. In this work, the effect of strain and loading rate on the response of NiTishape memory alloys within the first few tensile cycles was studied, and some new phenomena wasobserved.

关 键 词：超弹性 NITI 形状记忆合金 循环拉伸测试 

分 类 号：TB34[一般工业技术—材料科学与工程]