The enhancement of solute diffusion by solute additions was considered. Attention was focused upon a little-studied kinetic effect which led to solute enhancement. This arose from the kinetics of encounters, of a solute atom with a vacancy, in the presence of other solute atoms. The face-centered cubic random alloy model was used in the dilute limit. Monte Carlo techniques were used to calculate the solute diffusion enhancement factors, B1 and B2. The solute correlation factors, upon which the enhancement factors relied in this model, were calculated to very high precision by using long runs and by averaging over very large numbers of atoms. It was found that there was fair agreement with the Manning and Holdsworth-Elliott kinetic treatments; and excellent agreement with Moleko et al.’s self-consistent theory.

Calculation of Enhancement Factors for Solute Diffusion in the FCC Dilute Random Alloy. M.J.Brown, I.V.Belova, G.E.Murch: Philosophical Magazine, 2004, 84[11]. 1105-12