Abstract
Abstract The morphology of a multi-phase structure under irradiation is determined by the counteraction of precipitate dissolution due to cascade mixing and re-precipitation due to freely-migrating irradiation-induced point defects. A stability limit should occur when the precipitate volume change rates due to the two processes match each other. Work is reviewed which determines the stability limit for a Cu-Ni-Fe alloy and derives the effective cascade size from this stability limit. Consideration of the detection limit for precipitate dissolution focusses attention to the magnitude of the dissolution rate. A new method for determining dissolution rates by atom probe analysis is described. Measured data are compared with cascade mixing rates as determined in ion beam mixing experiments. It is shown that precipitate dissolution rates might be larger than cascade mixing rates.
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