| Abstract Scope |
Under extreme thermomechanical conditions, many structural alloys failure by intergranular cavities, whose growth can be controlled by grain boundary diffusion or constrained by creeping flow of neighboring materials. Both theoretical and computational methods are presented here, together with several representative case studies in modern engineering applications and advanced manufacturing. First, we show that the competition of above processes dictates the operation window of solid-state additive manufacturing techniques. Second, the cavity kinetics can be further combined with hydrogen transport and reaction analyses, which helps establish a micromechanical framework for microstructure-explicit analysis of the high temperature hydrogen attack problem. Third, we develop a simple rationalization of the dependence of ductility on stress triaxiality with applications in superplasticity and metallic glasses. |