Abstract Scope |
In the search of strong and ductile materials, one strategy is introducing interfaces, such as grain boundaries (GBs), twin boundaries, or phase boundaries to resist dislocation motions. This strategy is always accompanied by a decrease in material ductility although it does lead to a significant enhancement in material strength. Recently, several strategies to overcome this strength-ductility trade-off dilemma have been proposed and successfully demonstrated in experiments. Due to the length-scale limitation, a fully atomistic model usually can only accommodate small nanograins with sizes up to 10-20 nm. In contrast, starting from the principles of statistical mechanics, our concurrent atomistic-continuum (CAC) approach can accommodate grain sizes of hundreds of nanometers while maintaining the long-range dislocation slip and the atomically structured interfaces all within one model. In this talk, we will present our recent development of an adaptive CAC for investigating the microscale slip transfer across GBs and interfaces in polycrystalline structures. |