On the basis of the random walk of point defects in concentrated alloys, the annihilation kinetics of point defects in a face-centered cubic alloy were studied by means of computer simulation. In particular, the effect of the degree of order was considered by using the pair model to describe atomic interactions. The simulations covered almost the entire temperature range within which short-range order or short-range clustering occurred. Due to a special treatment, the escape probability for various trap structures could be determined as a function of the annealing time. Further evaluation yielded the trapping time of point defects for wide ranges of parameters such as the alloy composition and the mobility ratio of the components. Empirical functions were derived which described these dependences. The relationship between the activation energy for the annihilation of point defects and that for the self-diffusion of atoms in real alloys was found, and yielded a basis for studying diffusion properties by investigating point defect annihilation.

G.Yu: Acta Metallurgica et Materialia, 1995, 43[10], 3851-60