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 distribution 2. (2) a retardation of coarsening together with a narrowing of the distribution 3. (3) a gradual approach to classical behaviour.
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