Model description of grain boundary diffusion processes in nano- and microcrystalline solid systems

The simple model of grain and phase boundaries diffusion into polycrystalline solid system with nano- and micro grain dimensions is proposed. There are considered different types of diffusion regimes which are realized by definite correlations between volume and grain boundary diffusion lengths and average grain sizes. The study shows the temperature regimes where the diffusion along triple junctions is the control stage of structural processes in metal materials. Keywords: metal materials, solid polycrystalline, diffusion, nano, polycrystalline