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经典形核理论告诉我们,当新相自母相中形核时,总自由能变化为其中-△G_▼为单位体积自由能的变化,V为新相的核心体积,A为表面自由能(其与曲率无关),A为新相生成所增加的表面积。 在固态相变中,由于新相的结构与母相不尽相同,造成弹性畸变。所以,仅考虑体积自由能和表(界)面能的变化不足以描述固态中的形核,还需考虑弹性应变能E_e,即
The classical nucleation theory tells us that when the new phase nucleates in the self-mother phase, the total free energy can change as - ΔG_ ▼ as the change in free energy per unit volume, V as the core volume of the new phase, and A as the surface free energy Which has nothing to do with the curvature), A is the surface area increased by new phase formation. In the solid state phase change, due to the new phase of the structure and the mother of different, resulting in elastic distortion. Therefore, considering only the change of the free energy of the surface and the surface energy of the surface (boundary) is not enough to describe the nucleation in the solid state, the elastic strain energy E_e needs to be considered, that is,