1.18 - Radiation-Induced Segregation

Abstract

The main experimental results on radiation-induced segregation (RIS) are described. RIS can be modeled at different scales. Continuous methods are based on the thermodynamics of irreversible processes in which partial diffusion coefficients are estimated from diffusion experiments. To compensate for the lack of diffusion data, a multiscale approach has been developed. Atomic jump frequencies are parameterized from first-principles calculations, and the partial diffusion coefficients deduced using diffusion theories. While the procedure is well established for dilute alloys, more empirical methods are used for concentrated alloys. The atomic jump frequency models can be introduced in atomic-scale simulation methods.