It was shown that the dependence of self-interstitial cluster diffusivity in Fe–Cr alloys on Cr concentration correlated with that of swelling in these alloys under neutron irradiation; namely, with increasing Cr concentration the cluster diffusivity first decreased and then increased. The origin of such behaviour lay in a relatively long-ranged, ~1nm, attractive interaction between Cr atoms and crowdions. The minimum diffusivity was realized for ~11at%Cr, where all crowdions constituting the cluster interacted with Cr atoms, but the interaction fields of different Cr atoms did not overlap.

On the Correlation between Self-Interstitial Cluster Diffusivity and Irradiation-Induced Swelling in Fe–Cr Alloys. D.Terentyev, L.Malerba, A.V.Barashev: Philosophical Magazine Letters, 2005, 85[11], 587-94