An earlier master-equation approach, and kinetic cluster methods, were applied to the study of the kinetics of L10-type ordering in alloys; including the formation of twinned structures that were characteristic of cubic-tetragonal phase transitions. A microscopic model of interatomic deformational interactions was suggested which generalized a similar model, for dilute alloys, to the case of concentrated alloys. The model was used to simulate A1 → L10 transformations, after quenching an alloy from the disordered A1 phase to the single-phase L10 state, for a number of alloy models with differing chemical interactions, temperatures, concentrations and tetragonal distortions. A number of peculiar features were found in the transient microstructures and the transformation kinetics; many of which agreed well with experimental data. The simulations also demonstrated the interaction-dependent alignment of antiphase boundaries, in near-equilibrium twinned bands, which was observed in some experiments.Kinetics of Formation of Twinned Structures under L10-Type Orderings in Alloys. K.D.Belashchenko, I.R.Pankratov, G.D.Samolyuk, V.G.Vaks: Journal of Physics - Condensed Matter, 2002, 14[3], 565-89