A new model was developed for radiation-induced grain boundary migration and radiation-induced segregation in austenitic Fe-Cr-Ni alloys. It was assumed that the radiation-induced segregation was induced by the diffusion and annihilation of excess point defects at the grain boundary, and that radiation-induced grain boundary migration occurred due to the rearrangement of atoms on one of the interfacial planes via the annihilation of point defects. The calculated results indicated that the region of radiation-induced segregation was enlarged by radiation-induced grain boundary migration, and asymmetrical concentration profiles were observed around the migrated grain boundary. The present model could explain the radiation-induced segregation behavior, with or without, grain boundary migration; as compared with previous experimental results.

A New Model for Radiation-Induced Grain Boundary Segregation with Grain Boundary Movement in Concentrated Alloy System. N.Sakaguchi, S.Watanabe, H.Takahashi: Journal of Materials Science, 2005, 40[4], 889-93