Reordering kinetics of ion-disordered Ni3Al

A study of the reordering kinetics of ion-irradiated Ni3Al is presented. Th e development of long-range order during annealing treatments is measured b y quantitative electron diffractometry. According to the temperature depend ence of the observed kinetics, the reaction is dominated by son-equilibrium vacancies. As a consequence, the kinetics can be calibrated versus the abs olute number of atomic jumps necessary to establish the observed degree of order. In order to analyse the experimental data, Monte Carlo simulations a re performed. It is shows that, beside the temperature dependence of the dr iving force, the ordering efficiency of the vacancy jumps itself is tempera ture dependent due to different mobilities of the atomic species.