Disclination dipole-dislocation interaction in the interface of an elastically heterogeneous bilayer

The equilibrium positions of an edge dislocation gliding in the interface between two solids of different elastic coefficients have been determined in the neighborhood of a disclination dipole lying in a boundary separating two grains located in the upper phase. From the study of the Peach–Koehler force applied on the dislocation, the effects of the shear moduli and Poisson ratios of the two phases on the stability of the dislocation have been characterized. It is found that the stable positions do not depend on the dipole strength and are observed only when the two solids are elastically heterogeneous. A condition on the elastic coefficients of both solids has been finally determined for which stable equilibrium positions exist in the interface.