A review was first presented of various possible core structures and related deformation phenomena, followed by the most important features of the dislocation cores that were found in computer simulations of L12, L10, DO19 and DO22 intermetallic compounds. Contrary to the case of elemental close-packed metals, the cores of the dislocations in these close-packed intermetallics were frequently non-planar and exhibited very high Peierls stresses. The main reason for this was the crystal structure. The L10 and DO22 structures were tetragonal, and therefore the close-packed directions in the {111) planes were not all equivalent. The present analysis showed that, beside the crystallography, the most important parameter which controlled the dislocation core structure was the ordering energy. This effect was mediated via its influence upon the energy of the stacking fault-like planar defects that were present in the cores and play a role in dislocation dissociation.

Atomic Structure of Dislocations in Intermetallics with Close-Packed Structures: a Comparative Study. V.Vitek: Intermetallics, 1998, 6[7-8], 579-85