Thermo-mechanical coupling is an intrinsic property of first order martensitic transformation. In this paper, we study the temperature evolution during phase transition at a wider strain rates from quasi static to impact loading to reveal the thermodynamic nature of the strain rate effect of phase transition materials. Based on the laws of thermodynamics and the principle of maximum dissipated energy, a thermal-mechanically coupled model was proposed. The model shows that, in the quasi static case, the temperature profile grades around the moving phase boundary, while for the dynamic case, thermal response of the specimen can be reached homogeneously due to random nucleation. The predicted results of the model are in good agreement with the experimental results, suggesting that the interaction between the self-heating effect and the temperature dependence of phase transition behavior plays a leading role in the process of the transformation deformation mechanism associated with the loading rate.

热力耦合是一阶马氏体转变的固有特性。在本文中，我们研究了在从准静态到冲击载荷的较宽应变速率下，相变过程中的温度演化过程，以揭示相变材料的应变速率效应的热力学性质。基于热力学定律和最大耗散能量原理，提出了一种热力耦合模型。该模型表明，在准静态情况下，温度分布在移动相边界附近逐渐变大；而在动态情况下，由于随机成核作用，可以均匀地达到样品的热响应。模型的预测结果与实验结果吻合良好，