A dislocation near an interface between elastically anisotropic materials was subjected to an image force, attractive or repulsive, depending on the elastic constants of crystals on both sides of the interface and the geometry of the configuration studied. A study was made of the effect of image force on dislocations for bicrystals composed of two hexagonal materials (Zn-X where X was Be, Co, or Hf). The elastic interaction energy was calculated using the theory of Barnett and Lothe. The configuration is: a dislocation parallel to the interface with the Burgers vector b = a/3[¯21•0] and an interface which was defined by a rotation axis R = [00•1] and rotation angles in the interval [0°, 90°]. The interaction energies obtained were summarized in iso-energy maps. For a dislocation located in the crystal 1, if the crystal 2 was harder than the crystal 1 (μ2 > μ1), the elastic interaction energy was positive, therefore the dislocation was submitted to a repulsive image force.

Dislocation – Interphase Boundary Interaction in HCP Bicrystals Zn-X, X = Be, Co, Hf. A.Ayadi, A.Ouchtati, O.Khalfallah: IOP Conference Series - Materials Science and Engineering, 2010, 13[1], 012023