中文摘要：

利用X射线衍射研究了CoNiZ（Z=Si,Sb,Sn,Ga等）合金在不同热处理条件下的相组成.当Z元素为Sn,Sb时,材料是完全的B2结构;但Z为Si时,材料变成面心立方的γ相.形成B2还是γ相由电子浓度和原子尺寸效应两种因素共同决定.而CoNiGa的研究结果表明,在合金中除了形成B2结构的同时还容易形成γ相,常表现出两相共存的特性.对材料进行不同方式的热处理可以使合金中两相的含量有所消长,γ相含量的多少对CoNiGa合金的马氏体相变有很大的影响.分析指出,两相共存及其所带来的物性变化是CoNiGa铁磁性形状记忆合金非常有利用价值的物理性质.

英文摘要：

Structures of CoNiZ （ Z = Si, Sn, Sb, Ga） alloys have been investigated. We found that CoNiZ alloys have B2 structure with Z = Sn or Sb, but when Z = Si, the structure is fcc γ phase. When B2 structure coexists with γ phase in CoNiGa alloys, γ phase affects the temperature of martensitic transformation greatly. The structure of the alloy is determined by beth the electron concentration and the size effect. The coexistence of two phases in the CoNiGa alloys can be changed by various heat treatment conditions. These results indicate that the martensitic transformation behaviors can be adjusted just by heat treatments, other than by modifying the composition as being done conventionally for other ferromagnetic shape memory materials.