形变温度对Ti-Ni合金超弹性弹簧形变行为的影响  

Effect of Deformation Temperature on Deformation Behavior of Ti-Ni Alloy Superelasticity Spring

作　　者：牛艳娥[1] 贺志荣[2] 

机构地区：[1]榆林职业技术学院机电工程系,陕西榆林719000 [2]陕西理工学院材料科学与工程系,陕西汉中723003

出　　处：《热加工工艺》2016年第20期121-123,共3页Hot Working Technology

摘　　要：采用拉伸试验和应力应变循环试验研究了形变温度及应力应变循环对Ti-Ni50.8超弹性弹簧形变行为的影响。结果表明当形变温度在247K以下时Ti-Ni50.8弹簧呈形状记忆性,形变温度在247K以上时呈超弹性特性。623~773K退火态Ti-Ni50.8弹簧室温下可获得良好超弹性。当退火温度超过873K后,超弹性衰减。在应力-应变循环早期,弹簧应变恢复率衰减很快,随循环次数增加,衰减变慢。Ti-Ni50.8弹簧预先应力应变循环训练可增强其变形稳定性。The effects of deformation temperatures and stress-strain cycle on the deformation characteristics of Ti-Ni50.8 superelasticity spring were investigated by tensile test and stress-strain cycling test. The results show that Ti-Ni50.8 alloy spring shows shape memory effect with deformation temperature below 247 K, and it shows superelasticity with deformation temperature above 247 K. The good superelasticity property at room temperature can be obtained for 623-773 K annealed Ti-Ni50.8 alloy spring, and when the annealed temperature is over 873 K, the superelasticity property of the alloy spring weakens. The strain recovery rate of the spring decays rapidly at the early of stress-strain cycle, and then slowly with cycle numbers increasing. The prior stress-strain cyclic training can enhance the deformation stability of Ti-Ni50.8 spring.

关 键 词：Ti-Ni50.8合金 弹簧 超弹性 形状记忆效应 形变 

分 类 号：TG156.2[金属学及工艺—热处理]