热处理对TiNi形状记忆合金回复稳定性能的影响  

Effect of heat treatment on stability of recovery properties of TiNi shape memory alloy

作　　者：李艳锋[1] 米绪军[1] 尹向前[1] 高宝东[1] 

机构地区：[1]北京有色金属研究总院有色金属材料制备加工国家重点实验室,北京100088

出　　处：《材料热处理学报》2011年第8期11-14,共4页Transactions of Materials and Heat Treatment

摘　　要：研究了热处理对TiNi合金回复稳定性能的影响。结果表明,马氏体相变温度Msσ和Mfσ随热机械循环次数增加而上升,而马氏体逆相变温度Asσ和Afσ随热机械循环次数的增加而下降。随着热机械循环次数的增加,相变温度逐步稳定。退火温度小于500℃,热机械循环下TiNi合金的回复性能稳定,退火温度达550℃时,TiNi合金组织长大,应力诱发马氏体变形时容易发生滑移,回复应变随热机械循环次数增加而下降,回复稳定性能变差。Effects of heat treatment on stability of recovery properties of TiNi alloy were studied.The results show that Msσ and Mfσ increase with increasing number of thermo-mechanical cycles,while Asσ and Afσ decrease contrarily.The transformation temperatures become steady with increasing number of thermo-mechanical cycles.The stability of recovery properties is well with thermo-mechanical cycling when the heat treatment temperature is below 500 ℃.The grain of the TiNi alloy grows when the heat treatment temperature reaches 550 ℃.The coarse grain will be prone to slip during stress induced martensite deformation,and it will result in the decrease of recoverable strain with increasing number of thermo-mechanical cycles.

关 键 词：形状记忆合金 TINI合金 相变温度 回复应变 

分 类 号：TG139.6[一般工业技术—材料科学与工程]