The effect of interface stress upon the interaction between a screw dislocation and a coated nano-inhomogeneity was investigated within the framework of surface elasticity. By using the complex variable function method, the stress fields in the inhomogeneous materials and the image force acting on the screw dislocation were derived analytically. The results indicated that, when the radius of the coated inhomogeneity was reduced to nanometers, the influence of interface stress on the motion of the dislocation near the inhomogeneity became significant and the image force acting on the screw dislocation depended upon the coated inhomogeneity size, which differs from the classical solution. The results were expected to be helpful in understanding the motion mechanism of the dislocation and relevant physical phenomena in three-phase nano-composite materials.

Size-Dependent of Interaction Between a Screw Dislocation and a Coated Nano-Inhomogeneity. D.X.Lei, Z.Y.Ou: Procedia Engineering, 2011, 14, 1629-36