Evolution of misfit dislocation network and tensile properties in Ni-based superalloys: a molecular dynamics simulation

The structural evolution of dislocation network is closely related to γ′ rafting and tensile properties. In this work, the effects of strain rate and temperature on the structural evolution of interface dislocation network in Ni-based superalloys are studied by molecular dynamics simulations. The correlation between the evolution of dislocation network and tensile properties is also explored. The results indicate that the dislocation network shows different degrees of deformation and damage at various strain rates and temperatures. The γ′ rafting depends on the damage structure of dislocation network at various strain rates and temperatures. Moreover, the tensile properties of interface in Ni-based superalloys are closely related to the evolution of dislocation network and dislocation motion mechanisms.