应用朗道理论 ,通过引进两个序参量 ,即马氏体转变百分数Φ和平均应变ε,将自由能密度函数按Φ和ε展开 ,讨论了外应力对初始相变温度TC、马氏体转变百分数和马氏体转变性质的影响。研究了Φ和温度T之间的关系 ,所得结论易与实验结果直接比较 Applying Landau theory, the free energy density function is developed by Φ and ε by introducing two order parameters, namely the percentage of martensite transformation Φ and the average strain ε. The effects of external stress on initial transformation temperature TC, martensite transformation Effect of percentage and martensitic transformation properties. The relationship between Φ and temperature T has been studied. The conclusions drawn are easy to compare directly with the experimental results