Radiation-induced segregation
Résumé
We present the main experimental and modeling results on radiation-induced segregation (RIS). Modeling of RIS is carried out at different scales. Continuous methods rely on the thermodynamics of irreversible processes for which one determines diffusion coefficients and diffusion driving forces from either diffusion experiments or a multiscale calculation method. The multiscale approach has greatly developed due to the lack of experimental diffusion data, and the progress of first principles methods and diffusion theories. One parametrizes atomic jump frequencies from first-principles calculations, and deduce the partial diffusion coefficients relying on diffusion theories. While the procedure is well established for dilute alloys, one relies on more empirical diffusion models for most of the concentrated alloys. From the parameterized atomic jump frequencies, we may develop multiscale simulations of RIS including the elastic interactions between the point defect sink microstructure and point defects.