Fe-Mn-Si-Cr-Ni形状记忆合金超弹性的研究  

A Study on the Pseudoelasticity of Fe based Shape Memory Alloy

作　　者：张初阳[1] 王小祥[1] 

机构地区：[1]浙江大学

出　　处：《材料科学与工程》1999年第2期42-45,共4页Materials Science and Engineering

摘　　要：用拉伸实验研究了Ｆｅ－１５．２Ｍｎ－６Ｓｉ－８．３Ｃｒ－７Ｎｉ、Ｆｅ－１６Ｍｎ－５Ｓｉ－９Ｃｒ－４Ｎｉ和３１７Ｌ不锈钢的应力应变曲线。结果表明，铁基形状记忆合金存在显著的超弹性。其应力应变曲线上，卸载时的曲线和再加载时的曲线相比有明显的滞后。合金卸载时存在极大的非线性回弹εｓｂ，εｓｂ随变形量的增加而增加，而超弹性应变εＳＥ在小变形量下随变形量的增加而增加，当总变形量超过一定值时，εＳＥ不再增加。Ｆｅ－１５．２Ｍｎ－６Ｓｉ－８．３Ｃｒ－７Ｎｉ的最大超弹性应变εＳＥ可达到０．７５％。应力诱发马氏体与母相之间界面移动产生超弹性，超弹性受化学驱劝力和母相对马氏体相的弹性约束控制。热形成马氏体和母相强度对超弹性影响不大。Tensile tests are carried out in Fe 15 2Mn 6Si 8 3Cr 7Ni、Fe 16Mn 5Si 9Cr 4Ni and 317L stainless steel. It is shown that Fe based shape memory alloys exhibite apparently pseudoelasticity. There are apparent hysteresis loop between unloading and reloading stress strain curve of Fe based shape memory alloy and large non linear springback strain ε sb during unloading. ε sb and pseudoelastic strain ε SE increase with increasing total strain ε 1 and ε SE saturate when ε t is high.The maxium pseudoelastic strain ε SE of alloy 1 is 0 75%. In alloy 2 ε SE is not higher than 0 45%. The movement of the interface bwtween stress induced martensite and parent phase determines the pseudoelasticity. there are two orgions of the pseudoelasticity: the chemical driving force (Δ G ) and the elastic constrained force of the surrounding parent phase. pseudoelasticity are not influenced by pre existing thermal martensite and the intensity of parent phase

关 键 词：超弹性 形状记忆合金 铁锰硅合金 

分 类 号：TG139.6[一般工业技术—材料科学与工程]