Radiation-induced inter-granular segregation in first wall fusion reactor materials

Experimental evidence for phosphorus segregation at grain boundaries in ste els is presented. Theories for irradiation-induced inter-granular segregati on are described. Non-equilibrium segregation (NES) and rate theory approac hes have similar success in predicting phosphorus behaviour in the practica lly important temperature range although site competition and micro-structu ral effects are better accounted for by the NES theory. The need for better data on diffusion constants and point defect-impurity binding energy is em phasised. (C) 2000 Elsevier Science B.V. All rights reserved.