Computational Study of Radiation-Induced Segregation Mechanisms In Metallic Alloys

In this talk, we propose a phase field model for radiation induced segregation in a binary alloy. This model serves as an example of how continuum scale methods rely on accurate quantification of the characteristics of radiation-induced defects, which were examined in Chapter 2. The proposed model allows for the examination of how irradiation conditions can impact the accumulation of radiation-induced defects and the radiation- induced degradation mechanism of radiation-induced segregation. The intent of the proposed phase field model is to provide a method that can be used to examine radiation-induced segregation behavior in binary alloy systems while including as few simplifications to the system as possible. Therefore, the proposed model includes the formation and evolution of defect clusters, the presence of additional defect sinks in the form of dislocations (which also interact with the chemical potentials of the point defect species through an applied stress field), and two different methods of radiation damage insertion, which are intended to simulate either electron beam or ion beam irradiation. In the talk, an examination of the effect of dose rate on the development of RIS is provided as well as a comparison in the RIS behavior of systems modeled using two different radiation damage insertion methods.