Abstract
Abstract The transition by cross-slip from an infinite superdislocation fully dissociated in the primary octahedral slip plane to the Kear-Wilsdorf (KW) configuration, which results from dissociation in the cube cross-slip plane, is examined analytically in the approximation of linear anisotropic elasticity. In the absence of lattice friction, a twofold (or a manifold) configuration that straddles the cube and the octahedral planes is always unstable. Lattice friction may temporarily freeze twofold configurations, but there is no mechanical driving force that tends to favour a nonplanar configuration, irrespective of the application of an external stress. The preference for either of the two planar stable configurations, which is controlled by the antiphaseboundary (APB) energy ratio on these planes, z = γo/γc, and by the deviation from isotropic elasticity, can be modified by an appropriate choice of the shear stresses resolved on the two planes under consideration. The role of the subdissociation of eac...
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