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根据相界面摩擦原理 ,在推导出计算Ni2 MnGa系统热动力学参量的一般表示式的基础上 ,结合马氏体相变温度分别在室温以下、室温附近、室温以上三种非正配分比Ni2 MnGa单晶自发相变应变和交流磁化率随温度变化的测量结果 ,计算了三种样品马氏体相变过程中界面摩擦所消耗的能量 .结果进一步表明正是相变过程中的界面摩擦导致了相变的热滞后 ,而三种样品马氏体相变过程的摩擦耗能和相变热滞后存在较大差别的原因在于三种样品马氏体相变生成物具有不同的结构
Based on the principle of phase interface friction, based on the derivation of the general formula for calculating the thermodynamic parameters of Ni2 MnGa system, combining the martensite transformation temperatures below room temperature, around room temperature and above room temperature, The energy consumed by interfacial friction during the martensitic transformation of the three samples was calculated by the measurement results of the spontaneous phase transformation strain and the AC susceptibility of the single crystal with temperature changes. The results further show that it is the interfacial friction in the phase transition However, the reason for the large difference between the frictional energy loss and the phase transition thermal hysteresis in the martensitic transformation processes of the three samples lies in the fact that the martensitic transformation products of the three samples have different structures