General expressions for diffusion fluxes in binary alloys with allowance for elastic-stress fields and the non-equilibrium state of vacancies were obtained within the framework of the hole-gas model. The microscopic parameters that were included in these expressions were specified in terms of regular solid solutions. The influence of a non-equilibrium grain boundary which, for nanostructured materials was described by the model of chaotically distributed dislocations, upon the activation energy of diffusion in a near-boundary zone was considered. It was shown that even in an average zero field of elastic stresses, there was a change in the effective activation energy. The structure of a diffusion near-boundary zone and its parameters, i.e., characteristic spatial scales and their temperature dependences, were determined.

The Effect of Internal Stresses on Diffusion in Nanostructured Alloys. A.G.Kesarev, V.V.Kondratev: Physics of Metals and Metallography, 2007, 104[1], 1-7