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Abstract The interaction between misfit dislocation dipoles in the nanoscale coating layer and the nanowire is investigated. The analytical solutions of complex potential functions in the coating layer and the nanowire are derived by means of the complex variable method. With the aid of the Peach-Koehler formula, the explicit expression of the image force and the mismatch stress acting on the screw dislocation dipoles are given. The results show that the impact of the interface stress and the mismatch stress on the motion of misfit dislocation dipoles is very significant. Under certain conditions, the presence of the interface stress and mismatch stress can change the interaction mechanism between the misfit dislocation dipoles and nanowire. Compared to the macroscale linear materials, the equilibrium position of misfit dislocation dipoles in the nanoscale coating layer will increase for considering the interface effect, the coating layer is more easy to generate misfit dislocation dipoles. The equilibrium postion of misfit dislocation dipoles in the nanoscale coating layer will increase for considering the effect of nanowire lattice mismatch. It can be seen, we can control the generation of misfit dislocation dipoles by reducing the effect of nanowire lattice mismatch.
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Received: 08 September 2011
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2012, Vol. 33 
