Generalized stacking faults in model lattice of ordered Fe-Si alloys

The energies of the generalized stacking faults lying on {110} and {112} planes are calculated for Fe-Si alloys with the DO₃ long-range order for concentrations 10–25 at. % Si. In the used model, the interaction between atoms is described by the series of three central interatomic potentials fitted to experimental data. The lattice relaxations perpendicular to the stacking fault plane are considered. The displacement vectors corresponding to stable antiphase boundaries are found and some consequences for the structure of superdislocations in the DO₃ superlattice are mentioned.The author is indebted to Dr. F.Kroupa and Dr. L.Lejek for valuable discussion.