TiNiFe形状记忆合金热变形行为的研究  

Hot Deformation Behavior of TiNiFe Shape Memory Alloys

作　　者：尹向前[1] 王淑娟[1] 李艳锋[1] 解浩峰[1] 米绪军[1] 

机构地区：[1]北京有色金属研究总院有色金属材料制备加工国家重点实验室,北京100088

出　　处：《稀有金属》2012年第6期851-857,共7页Chinese Journal of Rare Metals

基　　金：国家科技部973项目(2010CB735811)资助

摘　　要：针对TiNiFe形状记忆合金,在Gleeble-3500热模拟试验机上对其进行了高温压缩实验,研究了TiNiFe合金在温度为750～1050℃、应变速率为0.01～10.00 s-1条件下的热变形行为。结果表明,流变应力受到变形温度和应变速率的显著影响,在相同变形温度条件下,流变应力随应变速率的提高而增大;在相同应变速率条件下,流变应力随变形温度的升高而降低。并采用双曲正弦模型确定了该合金的应力指数n和变形激活能Q,建立了相应的热变形本构关系。经实验验证,所建立的本构关系能够很好的反映TiNiFe合金的实际热变形行为特征。The characteristics of thermal deformation behavior of TiNiFe shape memory alloys were investigated by thermal simulation with Gleeble-3500 thermal simulation machine. The range of deformation temperatures in the test was from 750 to 1050 ℃ and that of strain rates was 0.01 to 10.00 s-1. The results showed that the flow stress increased with the decrease of deformation temperatures and the increase of strain rates. The hot deformation constitutive relation was established on the basis of Arrhenius-type hyperbolic-sine mathematics model. The predicted values of the model agreed well with the experimental data.

关 键 词：形状记忆合金 热模拟 变形激活能 本构关系 

分 类 号：TG139.6[一般工业技术—材料科学与工程]