运用马氏体相变拓扑模型研究了Ni2MnGa合金中相界面位错结构及马氏体相变晶体学,并将计算结果与马氏体相变唯象理论进行了对比.当选择相变位错b+1D1/+1和晶格不变应变位错bL=0.186[111-]M作为吸收共格应变的界面缺陷,且扭转角ω=3.2.时,惯习面Hp(2)的晶面指数为｛0.691-0.117 0.713｝p,与台阶台面的倾角为42.000°；两相的位向关系为:(111)p偏离(101)M 0.317.,[110-]p偏离[111-]M约3.200°.上述计算结果与基于马氏体相变唯象理论的估算值非常接近,表明Burgers矢量长度较小的界面缺陷在相变过程中更容易被激活,由此计算所获得的理论结果也更符合马氏体相变唯象理论基于不变平面的假设.另外,还用马氏体相变拓扑模型计算并获得了马氏体相变唯象理论所无法获得的相界面缺陷网结构参数,说明这种模型比唯象理论更普适、更优越.
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