TiNi单晶形状记忆合金制备及组织和性能研究  

Single Crystal of TiNi Shape Memory Alloy and Its Microstructures and Properties

作　　者：王乐酉[1] 朱明[1] 毛协民[2] 李重河[2] 范荣辉[1] 

机构地区：[1]北京有色金属研究总院加工工程研究中心,北京100088 [2]上海大学材料科学与工程学院,上海200072

出　　处：《稀有金属》2008年第3期279-283,共5页Chinese Journal of Rare Metals

摘　　要：在自行设计的高温度梯度定向凝固装置中,采用改进后的Bridgeman法,用特制的引晶器,成功拉制出Ti-50.8%Ni形状记忆合金单晶。做了结构和组织的观察,并使用DSC,SEM,XRD等方法对其相变及记忆性能等进行相应的分析研究。结果表明:这种钛镍形状记忆合金具有柱状单晶显微组织特征,消除了横向晶界;塑性加工性能、记忆稳定性、冷热循环次数均有较大提高。In a directional solidification equipment with high temperature gradient, single crystal specimens of the Ti-50.8 % Ni shape memory alloy （ SMA ） were prepared successfully by the modified Bridgeman method with special seeding. The shape memory effect and phase transition and microstructure were investigated by means of differential scanning calorimeter（DSC）, X-ray diffraction （ XRD ）, scanning electron microscope （SEM）, and so on. The results showed that the microstructure of the specimen of TiNi shape memory alloy was a single crystal with column structure. And its plastic work performance, memory stability and number of cycle of hot-cold were improved obviously.

关 键 词：单晶 定向凝固 TINI 形状记忆合金 

分 类 号：TG139.6[一般工业技术—材料科学与工程]