The interaction between Cu-rich precipitates in α-Fe and either vacancies or self-interstitial atoms and their clusters was studied by atomic-scale modelling. Results were compared with predictions of elasticity theory and interpreted in terms of size misfit of precipitates and defects, and the modulus and cohesive energy differences between Fe and Cu. Interstitial defects were repelled by precipitates at large distance but, like vacancies, attracted at small distance. Hence, Cu precipitates in Fe could be sinks for both vacancy and interstitial defects, and could act as strong recombination centres under irradiation conditions. This leads to a tentative explanation for the mixed Cu–Fe structure of precipitates and the absence of precipitate growth under neutron irradiation conditions. More generally, both vacancy and interstitial defects may be strongly bound to precipitates with weaker cohesion than the matrix.

Characteristics of the Interaction of Cu-Rich Precipitates with Irradiation-Produced Defects in α-Fe. A.C.Arokiam, A.V.Barashev, D.J.Bacon, Y.N.Osetsky: Philosophical Magazine Letters, 2005, 85[9], 491-501