The effects of ballistic jumps on the thermal and total diffusion of solvent and solute atoms in dilute face-centered cubic alloys under irradiation were studied. Generalized 5-frequency models were introduced for the diffusion components that resulted from vacancy migration, and it was shown that ballistic jumps produced de-correlation effects that had a moderate impact upon self-diffusion but could enhance or suppress solute diffusion by several orders of magnitude. These could lead to new irradiation-induced transformations; especially in the case of sub-threshold irradiation conditions. It was also shown that the mutual effect of thermal and ballistic jumps resulted in a non-additivity of partial diffusion coefficients: the total diffusion coefficient under irradiation could be less than the sum of the thermal and ballistic diffusion coefficients. The predictions were supported by kinetic Monte Carlo simulations. This could be extended so as to take

account of the effect of ballistic jumps on the diffusion of dumb-bell interstitials in dilute alloys.

Self-Diffusion and Solute Diffusion in Alloys under Irradiation - Influence of Ballistic Jumps. J.M.Roussel, P.Bellon: Physical Review B, 2002, 65[14], 144107 (9pp)