The long-range stress fields which were generated in deformed polycrystals by grain boundaries and junction lines, and the corresponding redistribution of impurity atoms due to elastic interaction with the stress fields, were considered. The effect was evaluated at 270C for deformed body-centered cubic polycrystals which contained P impurity. It was assumed that, under neutron irradiation, the impurity atoms were in interstitial positions and formed mixed P-Fe dumb-bells which had a relaxation volume of about one atomic volume of the host crystal. Redistribution resulted in impurity conglomeration around grain junction lines. The local P concentration was more than 50% higher then its mean value in bands which were as wide as 10% of the grain size.

Local Segregation at the Grain Junction - Elastic Singularity and its Effect on Radiation Embrittlement. A.A.Zisman, V.V.Rybin: Materials Science Forum, 1999, 294-296, 153-6