NiTi形状记忆合金相变过程中的超声波声速特性  

Behavior of Ultrasound Velocity of NiTi Shape Memory Alloy during Phase Transformation Process

作　　者：王开圣[1] 赵志敏[1] 汪东华[2] 

机构地区：[1]南京航空航天大学理学院,南京210016 [2]江苏省标准化研究院,南京210029

出　　处：《理化检验（物理分册）》2011年第8期487-489,498,共4页Physical Testing and Chemical Analysis(Part A:Physical Testing)

基　　金：教育部博士点专项基金资助项目(20093218110024);国际合作基金资助项目(BZ2010060)

摘　　要：用超声脉冲反射法测试了NiTi形状记忆合金(SMA)在相变过程中的纵波声速,研究了合金声速随温度变化的规律。结果表明:在非相变温度范围内,NiTi合金声速随温度缓慢变化,但在发生相变的温度范围内,声速的变化趋势发生明显改变;测得NiTi合金的各相变温度与常规电阻法基本一致,与电阻法等其他测量相变温度的方法相比,纵波声速法具有简单易行、测量方便以及对工件无损伤等优点。The ultrasound velocity of longitudinal wave of NiTi shape memory alloy（SMA） had been determined by pulse-echo method and the ultrasound velocity was measured at different temperature.The results show that the ultrasound velocity varied slowly with temperature if no phase transformation was induced,but sudden change in the ultrasound velocity could be observed when phase transformation occured.The phase transformation temperature determined by the ultrasound velocity method had a good consistence with that of the traditional electric resistance method.It could be concluded that the ultrasound velocity method with the advantage of operating conveniently,no damage to parts and so on could be used to examine phase transformation of SMA.

关 键 词：超声波声速 NITI形状记忆合金 相变 相变温度 

分 类 号：TG115.28[金属学及工艺—物理冶金]