Precipitate coarsening induced by point-defect recombination in alloys under irradiation
Identifieur interne : 000312 ( Main/Exploration ); précédent : 000311; suivant : 000313Precipitate coarsening induced by point-defect recombination in alloys under irradiation
Auteurs : K. Urban [France] ; G. Martin [France]Source :
- Acta Metallurgica [ 0001-6160 ] ; 1982.
Abstract
A new theory for the coarsening of precipitates in irradiated alloys is proposed. It is shown that point-defect recombination at the precipitate-matrix interface leads to a reduction of the solute solubility and to a novel driving force for coarsening. The basic coarsening equations are derived from a Fokker-Planck equation. An analytical solution assuming quasi-steady-state conditions and a fully numerical solution are presented. The results agree well with each other. Taking the results of the classical coarsening theory as reference, irradiation leads with increasing mean precipitate radius to a modification of coarsening in three phases: 1.(1) acceleration of coarsening accompanied by a widening of the size distribution2.(2) a retardation of coarsening together with a narrowing of the distribution3.(3) a gradual approach to classical behaviour.
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DOI: 10.1016/0001-6160(82)90016-5
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