Multiscale computational approach of grain size effect on plastic deformation

Tsuru, Tomohito   ; Aoyagi, Yoshiteru*; Shimokawa, Tomotsugu*; Kaji, Yoshiyuki  

Recent progress in grain boundary engineering allows the effective control of grain scale and microstructure in metallic systems, improving bulk material properties. It has been possible to produce nano-crystalline and ultrafine-grained metals with submicron grain size. Mechanical properties of the nano structured metals cannot be predicted based on assumptions of the average quantity of collective motion of dislocations, and therefore it is increasingly necessary to understand the role of each grain and its effect on the plastic deformation. In the present study, a multiscale computational modelling based on atomistic and crystal plasticity (CP) analysis is developed to capture the effect of grain size and macroscopic mechanical properties.