热循环对Ni_(47)Ti_(44)Nb_9合金马氏体相变和记忆性的影响

Effects of Thermal Cycles on Martensitic Transformation and Shape Memory Effect of Ni 47 Ti 44 Nb 9 Alloy

用电阻、恢复率同步测量的方法，研究了热循环对Ｎｉ４７Ｔｉ４４Ｎｂ９合金马氏体相变和记忆性的影响，并通过Ｘ－射线衍射、金相观察等方法对其微观机理进行了探讨。结果表明，随着热循环次数的增加，合金Ｍｓ明显下降；但热循环不能诱发Ｒ相变，并对合金记忆性无明显影响。

The influence of thermal cycles on martensitic transformation and shape memory effect of Ni 47 Ti 44 Nb 9 alloy was studied by simultaneous measurement of electrical resistance and shape memory change. To classify the micromechanism,the metallograph and X ray diffraction were used.The results showed that the alloy's M s decreased with the increase of the cycling number. But thermal cycles couldn't introduce 'R' phase or greatly change the alloy's SME.