外应力对热弹性马氏体相变的影响

The Influence of the External Applied Stress on the Thermoelastic Martensitic Tansformation

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 。

Introducing two order parameters, i. e.,the percent Φ of transformed martensite and the mean strain ε ,and spreading out a free energe density function according to Φ and ε ,this paper is mainly to discuss the influence of external applied stress σ on the initial phase transition temperature T C , the amount of the transformed martensite and the nature of the martensitic transformation by making use of Landaus phenomenological theory. The relations between Φ and temperature T has been investigated. The obtained conclusion can directly be compared with experimental results.