Modelling of irradiation-induced reordering in Ni3Al on the basis of the migration of point defects |
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| Affiliation: | 1. EURATOM/UKAEA Fusion Association, Culham Science Centre, Oxfordshire OX14 3DB, UK;2. Department of Physics, Imperial College, Exhibition Road, London SW7 2AZ, UK;1. CECM–CNRS, 15 rue Georges Urbain, F-94407 Vitry-sur-Seine Cedex, France;2. INSTN, CE Saclay, F-91191 Gif-sur-Yvette Cedex, France;1. DGA/CREA, 16 bis avenue Prieur de la Côte d''Or, F- 94212 Arcueil Cédex, France;2. CNRS/IMP, Université, 52 avenue de Villeneuve, F- 66860 Perpignan cedex, France;3. AÉROSPATIALE — CCr, 12 rue Pasteur, BP76, F- 91152 Suresnes, France;1. Laboratoire de Spectronomie, Equipe Couches Minces, Département de Physique, Faculté des Sciences de Rabat, B.P. 1014, Rabat, Maroc |
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| 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 L12 Ni3Al 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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