无镍Ti-Nb基合金的形状记忆效应和超弹性  

Shape Memory Effect and Superelasticity of Ni-Free Ti-Nb-based Alloys

作　　者：周正存[1] 郭德稳 杜洁[1] 张义平[1] 顾苏怡[1] 严勇健[1] 

机构地区：[1]苏州市职业大学机电工程学院,江苏苏州215104 [2]安徽国祯环保节能科技股份有限公司研发部,安徽合肥230088

出　　处：《苏州市职业大学学报》2015年第1期1-6,共6页Journal of Suzhou Vocational University

基　　金：江苏省海外留学基金资助项目;青蓝工程资助项目;苏州市职业大学校级资助项目(2013SZDYJ05)

摘　　要：无镍Ti-Nb基合金是具有应用前景的无毒形状记忆合金和超弹性合金.综述无镍Ti-Nb基合金的形状记忆性能和超弹性,结果表明优良形状记忆效应和超弹性的获得,需要有合适的化学成分和适当的热处理.β型Ti-Nb合金从高温β相区快速冷却经过一个马氏体转变,转变成α’马氏体或者α＂马氏体,从β相到α＂相的转变是热弹性马氏体转变,由此而产生形状记忆效应和超弹性.随着Nb含量的增加,马氏体转变温度降低,在所报道的Ti-Nb合金中,Nb含量主要集中范围在22~26（at.%）,这是由于室温超弹性发生在此成分范围.Zr、Sn、O、Al等元素对Ti-Nb基合金的形状记忆性能和超弹性有影响,这些元素的添加降低了Ms,增加了超弹性,超弹性比较好的合金有Ti-22Nb-4Zr（at.%）,可恢复应变最大达4.3%.在添加Al的合金Ti-Nb基合金中,Ti-24Nb-3Al（at.%）合金具有的最大可恢复应变达到4.7%.Ni-Free Ti-Nb-based alloys have potential application as superelastic alloys with non-toxic shape memory. The shape memory behavior and superelasticity of free-Ni Ti-Nb-based alloys are described and discussed in this paper. It is shown that the excellent shape memory behavior and superelasticity can be obtained by a suitable chemical composition and heat treatments. β-Ti-Nb alloys undergo a martensitic transformation when thay are rapidly cooled from the β phase region at high temperatures. This transformation produces α＇or α＂martensite.The transformation from β phase to α＂martensite is a thermoelastic one and thereby produces shape memory effect and superelasticity. The start temperature of martensitic transformation（Ms） decreases with increasing Nb contents. Nb contents are located between 22-26 at.% among the reported Ti-Nb alloys since the superelasticity at room temperature exists when the Ti-Nb alloys have the compositions of 22-26 at.%Nb. The addition of the elements such as Zr,Sn,O and Al have influences on the shape memory effect and superelasticity of Ti-Nb alloys,which decreases Ms and increases superelasticity. Ti-22Nb-4Zr（at.%） and Ti-24Nb-3Al（at.%） possess large recovery strain. The maximum recovery strain is 4.3% for the former and 4.7% for the latter,respectively.

关 键 词：无镍Ti-Nb基合金 形状记忆性能 超弹性 

分 类 号：TG146.23[一般工业技术—材料科学与工程]