Dislocation Dissociation and Dislocation Core Structures in F.C.C.-Based Tetragonal Superstructures

Firstly, the dependences of fault energy γ on displacement for (111), (010) and (110) planes in the L1₀ structure have been calculated using central-force potentials. Secondly, for some dissociation schemes of dislocations in this structure, the core structure of the corresponding partial dislocations has been calculated. The implications of these results for the deformation of L1₀ alloys and compounds, in particular, TiAl are discussed.