通过光学显微分析、XRD、TEM、EDS、DSC、SEM和压缩试验等方法研究了Co48Ni24+xGa28-x(x=0,2,4,6)高温形状记忆合金的微观组织、相变行为、力学性能及形状记忆性能.结果表明,该合金系室温下是由非调制的四方马氏体相和面心立方的γ相组成的双相合金.随Ni含量增加,γ相的体积分数增加,合金的马氏体相变温度升高,这主要归因于马氏体相电子浓度和尺寸因素的综合影响.γ相显著阻碍了马氏体相晶界面的相对滑动,因此随γ相含量增加,合金的抗压强度和压缩变形率逐渐升高.但γ相降低形状记忆性能,随γ相含量增加,合金的最大形状记忆回复应变从1.7％(x=0)降至0.4％(x=6).
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