365 / 2019-02-28 08:56:10

Point defect sink strength of low-angle tilt grain boundaries: a phase field dislocation climb model

Radiation; Grain boundaries; Dislocation climb; Sink strengths; Point defect

全体主题 > High Pressure Physics and Materials Science

Evaluating the capability of a grain boundary of absorbing point defects is primarily important for the applications of radiation resistant materials. The point defect sink strength of low-angle symmetrical tilt grain boundaries is investigated by phase field dislocation climb model under irradiation. The results indicate that sink strength of grain boundary is not only determined by the long-range point defect diffusion but also the short-range point defect absorption by the dynamic climbing of grain boundary dislocations. All of the study findings prove that the microstructure evolution of grain boundaries is essential to evaluate radiation-resistant ability of materials.