Abstract
The kinetics of reordering under irradiation was investigated using a chemical reaction model in the case of vacancy- or interstitial-controlled mechanisms. We have calculated the theoretical temperature dependence of the steady-state degree of order in L1 2 Ni 3Al using the results of recent investigations of point defect properties, in various regimes of point defect annihilation. In a given annihilation regime, the temperature dependence of the steady-state degree of order shows a clear difference between interstitial and vacancy mechanisms. An important result is that a significant reordering can only be related to vacancy diffusion, except when the mutual recombination is the main annihilation process.
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