The formation of the L12 phase in an A3B intermetallic solid solution was investigated by using Monte Carlo simulations. The ordering was modelled using a simple atomic exchange mechanism which was based upon a face-centered cubic Ising model with appropriate values for the pairwise atomic interactions. It was shown that the ordering kinetics occurred on 2 time-scales: nucleation and growth of ordered domains, and the annealing of antiphase boundaries between the domains. The model was applied to the L12-ordered Ni3Al phase under various irradiation conditions. It was demonstrated that the migration and annihilation of antiphase boundaries largely determined the temporal evolution of the L12 phase.

Kinetics of Antiphase Domain Boundaries during an L12 Order-Disorder Phase Transformation - a Monte Carlo Simulation. C.Abromeit, S.Matsumura: Philosophical Magazine A, 2002, 82[11], 2287-302