温度对医用TiNi形状记忆合金丝微观组织和力学行为的影响  

Effects of Temperature on Microstructure and Mechanical Behaviour of Biomedical TiNi Shape Memory Alloy Wire

作　　者：李明高[1] 孙大千[1] 邱小明[1] 孙德新[1] 殷世强[1] 

机构地区：[1]吉林大学,吉林长春130025

出　　处：《稀有金属材料与工程》2007年第6期998-1001,共4页Rare Metal Materials and Engineering

基　　金：吉林省自然科学基金项目(20000518)资助

摘　　要：采用透射电镜和拉伸试验研究了温度对医用TiNi形状记忆合金(TiNiSMA)丝微观组织和力学性能的影响。结果表明,TiNiSMA微观组织和力学性能对温度变化极为敏感。对TiNiSMA进行短时加热处理,随加热温度升高,TiNiSMA组织由冷拔态纤维状组织逐渐转变为板条状马氏体群组织,且组织粗化,位错密度下降;TiNiSMA抗拉强度和超弹性能下降,塑性增加,当加热温度超过400℃时这种趋势更加显著。Effects of temperature on the microstructure and mechanical behaviour of TiNi shape memory alloy （TiNi SMA） wire have been studied by means of transmission electron microscopy （TEM） and tensile tests. The results show that the microstructure and mechanical properties of TiNi SMA are extremely sensitive to temperature. The fibrous structure of cold-drawn TiNi SMA is gradually translated to the plate martensitic structure, in which the grains were coarsened and the dislocation density decreased with the increase of heating temperature. The tensile strength and super-elasticity of the TiNi SMA decreased but the plasticity increases with the increase of temperature. These changes of the microstructure and mechanical behaviour were more conspicuous when the heating temperature was more than 400℃.

关 键 词：TINI形状记忆合金 温度 微观组织 力学行为 

分 类 号：TG139.6[一般工业技术—材料科学与工程]