STATISTICAL THEORY FOR GRAIN BOUNDARY SELF-DIFFUSION IN METALS,

A disordered liquid-like defect model for grain boundary self-diffusion in metals is described. This model is based upon a simple liquid lattice approach formulated for liquid metals in a previous document and reviewed in the first section of the current document. The model assumed for the disordered defect in the grain boundary consists of four atoms which occupy six defect sites. It is shown that this model yields reasonable values for the energies of atoms in the region of the defect and the D sub o factor in the expression for the coefficient of self-diffusion along the grain boundary. Author