Multiscale modelling of plastic flow localization in irradiated materials

摘要: The irradiation of metals by energetic particles causes significant degradation the mechanical properties1,2, most notably an increased yield stress and decreased ductility, often accompanied plastic flow localization. Such effects limit lifetime pressure vessels in nuclear power plants3, constrain choice materials for fusion-based alternative energy sources4. Although these phenomena have been known many years1, underlying fundamental mechanisms their relation to field not clearly demonstrated. Here we use three-dimensional multiscale simulations irradiated to reveal localization in defect-free channels. We observe dislocation pinning irradiation-induced clusters defects, subsequent unpinning as defects are absorbed dislocations, cross-slip latter is increased. width channels limited interaction among opposing dipole segments remaining defect clusters.