Motion of misfit dislocation in an Ni/Ni3Al interface was studied in periodic simulation cells subjected to applied shear stress. Three different motion mechanisms of the misfit dislocation were observed. The simulation results show that at low stress, the motion of misfit dislocation occurs through the nucleation and propagation of the double kinks; however, at higher stress, the motion of misfit dislocation was obstructed by an intrinsic stacking fault. The simulation results suggest that the stability of the Ni/Ni3Al interface strongly relates to the interaction of the misfit dislocations that were perpendicular to each other.

Motion of Misfit Dislocation in an Ni/Ni3Al Interface: a Molecular Dynamics Simulations Study. H.X.Xie, C.Y.Wang, T.Yu: Modelling and Simulation in Materials Science and Engineering, 2009, 17[5], 055007