Vacancy transport has a demonstrable impact on the microstructural evolution of polycrystalline metals, but existing models typically require knowledge of the stress state in order to describe lattice site generation and annihilation at interfaces. Using irreversible thermodynamics, the driving forces and equilibrium conditions dictating the response of incoherent interfaces are derived for a pure metal with vacancies under stress-free conditions. A phenomenological set of linear kinetic expressions that guarantees a decrease in the total energy upon diffusion is proposed. A near-equilibrium steady-state analytical solution for grain boundaries is obtained. In the stress-free limit, interface migration and transboundary diffusion are closely coupled, as are the production or annihilation of vacancies and the rigid-body dilation or contraction of the bulk grains. Solutions for various limiting kinetic regimes are also obtained, and the relevance of the kinetic parameters to pore nucleation at grain boundaries is discussed.

中文翻译：

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空位传输和表面吸附对纯金属晶界迁移的影响

空位传输对多晶金属的微观结构演化具有明显的影响，但现有模型通常需要了解应力状态才能描述界面处晶格位点的生成和湮灭。利用不可逆热力学，针对无应力条件下具有空位的纯金属导出了决定非相干界面响应的驱动力和平衡条件。提出了一组唯象线性动力学表达式，保证扩散时总能量的减少。获得了晶界的近平衡稳态解析解。在无应力极限下，界面迁移和跨界扩散紧密耦合，空位的产生或消灭以及块体晶粒的刚体膨胀或收缩也是如此。还获得了各种极限动力学状态的解，并讨论了动力学参数与晶界处孔成核的相关性。