Formation of impurity atmospheres and their influence on swelling and creep rates i n interstitial solid solutions

Taking into account the interactions between interastitials, the equilibrium impurity atmospheres around edge dislocations in interstitial solid solutions have been calculated. The impurity concentrations in atmospheres were obtained as a function of the distance to the dislocation core, the temperature, and the mean impurity concentration in the specimen. With use of the numerical methods calculated were the intrinsic point defect fluxes onto dislocations surrounded by the impurity atmospheres. It has been established that the efficiences of the dislocation absorption of interstitials (Zi) and vacancies (Zv) are decreasing as compared to the crystal without impurities, and the Zi decreases more rapidly than Zv. As a result, the impurity concentration increase leads to the decreasing in the dislocation preference factor B, the swelling rate S and the radiation creep rate εγ. 10 refs., 5 figs