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Abstract
The image effects on dislocations situated near and parallel to a grain boundary are examined as a function of the grain boundary misorientation in b.c.c. iron on the basis of the anisotropic theory of elasticity. It is pointed out that screw dislocations are generally repelled from any grain boundary, the only exception occurring when the Burgers vector is parallel to the rotation axis of the two crystals: in this case there is no image force. Isoenergy curves are drawn for all other situations.