定义了一个能反映形状记忆合金超弹性和形状记忆效应的概念：形状记忆因子. 利用相变过程中自由能与马氏体体积分数之间的微分关系，推导了形状记忆因子演化方程. 从细观力学角度建立了一个考虑马氏体择优取向过程的形状记忆合金三维本构模型. 与功能相同的现有模型相比，该模型具有更简单的数学表述和清晰的物理意义.
The conception of shape memory factor is defined to describe the superelasticity and shape memory effect of shape memory alloys. From the differential relationship between martensite fraction and free energy during phase transformation, a shape memory factor evolvement equation is established. Based on micromechanics theory, a 3-dimension constitutive model with considering the process of martensitic reorientation is developed, which possesses simpler mathematics form and clearer physics meaning than the previous models with the same functions.
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