应力约束条件下Ti49.8Ni50.2合金的逆相变行为
Reverse Martensitic Transformation of Ti49.8Ni50.2 Alloy under Stress Constraint Condition
摘 要
对经8.25%预应变后的Ti49.8Ni50.2合金在不同恒应力(10,60,110,160,210,260和310 MPa)约束下的逆相变行为进行了研究.结果表明:约束应力使得储存在马氏体中的弹性能释放,导致逆相变温度(A′s,A′f)升高;应力约束条件下马氏体在逆相变过程中,由于发生了塑性变形,引起了回复应变的减少;相变温度的升高和回复应变的减少均与约束应力成线性关系;还推导出了变应力约束条件下逆相变产生的回复应力和马氏体转变量的计算公式.
应力约束
逆马氏体相变
TiNi shape memory alloy
stress constraint
reverse martensitic transformation
Abstract
The reverse martensitic transformation of 8.25% pre-strained Ti49.8Ni50.2 alloy wire constrained at different constant stresses was investigated.The results show that the reverse martensitic transformation start temperature A′s and finish temperature A′f increased linearly with the increase of constant stress,which was thought to be related with the release of elastic energy of martensite,while the reverse transformation span and martensitic transformation rate were almost not changed.On the other side,linear relationship was also discovered in the recoverable strain and residual strain versus constant stress curves.The reverse transformation in elastic restraint was analyzed and the calculation formula of recovery stress and martensitic transformation rate were deduced.
中图分类号 TG139.6
所属栏目 材料性能及其应用
基金项目 国家自然科学基金资助项目(50471021)
收稿日期 2008/2/22
修改稿日期 2008/7/15
网络出版日期
作者单位点击查看
备注尹向前(1982-),男,湖南娄底人,硕士研究生.
引用该论文: YIN Xiang-qian,LI Yan-feng,GAO Bao-dong,MI Xu-jun. Reverse Martensitic Transformation of Ti49.8Ni50.2 Alloy under Stress Constraint Condition[J]. Materials for mechancial engineering, 2009, 33(2): 74～77
尹向前,李艳锋,高宝东,米绪军. 应力约束条件下Ti49.8Ni50.2合金的逆相变行为[J]. 机械工程材料, 2009, 33(2): 74～77
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参考文献
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【2】舟久保,熙康.形状记忆合金[M].千东范,译.北京:机械工业出版社,1992:143-210.
【3】Strnadel B,Ohashi S,Ohtsuka H,et al.Cyclic stress-strain characteristics of Ti-Ni and Ti-Ni-Cu shape memory alloys[J].Materials Science and Engineering,1995,A202:148-156.
【4】高万夫.约束态相变中TiNi形状记忆合金的马氏体自拉伸过程[J].材料研究学报,2006,20(3):319-322.
【5】Li Y,Cui L S,Xu H B,et al.Constrained phase-transformation of a TiNi shape memory alloy[J].Metallurgical and Mater Trans,2003,34(2):219-223.
【6】刘晓鹏,金伟,曹名州,等.TiNi合金约束相变行为研究[J].金属学报,2004,40(2):130-134.
【7】Wu S K,Lin H C,Lin T Y.Electrical resistivity of Ti-Ni binary and Ti-Ni-X(X=Fe,Cu) ternary shape memory alloys[J].Materials Science and Engineering,2006,40:536-539.
【8】Min Piao,Kazuhiro Otsuka,Shuichi Miyazaki,et al.Mechanism of the as temperature increase by pre-deformation in thermoelastic alloys[J].Materials Transactions,1993,30(10):919-929.
【9】Tanaka K.A thermomechanical sketch of shape memory effect: one-dimension tensile behavior[J].Res Mechanica,1986,18(13):171-176.
【10】Brinson L C.One-dimension constitutive behavior of shape memory alloys: thermomechanical derivation with non-constant material functions and redefined martensite internal variable[J].Intell Mater Syst and Struct,1993,16(4):229-223.
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