一种新型形状记忆合金的相组成

Constitotional Phases in A New Shape Memory Alloy

采用光学显微镜、扫描电镜、透射电镜和Ｘ射线衍射仪研究了新型形状记忆合金Ｎｉ４７Ｔｉ４３Ｎｂ９Ａｌ１的相组成及其结构。结果表明，室温下该合金由具有Ｂ２结构的ＴｉＮｉ相和具有体心立方结构的β－Ｎｂ相组成；β－Ｎｂ相多呈椭球状分布于合金基体中，其尺寸在０．２～１．２μｍ之间。添加到合金中的铝在ＴｉＮｉ相和β－Ｎｂ相中的分布相差较大，铝主要固溶于β－Ｎｂ相。

The constitutional phases and microstructure of Ni47Ti43Nb9Al1 alloy have been studied by means of optical microscopy,SEM,TEM and X-ray diffraction.It has been shown that the microstructure of the alloy consists of two phases:TiNi matrix with B2 structure and β-Nb with bcc structure.The β-Nb particles of 0.2-1.2μm appear to be cllipsoid-like and dispersed in the matrix.Moreover,the distribution of Al in the alloy is not uniform.