Abstract

Classical fluctuational theory is modified to describe nucleation processes in a dissipative system, namely alloys under irradiation. The nucleation rate equations for void nucleation in the presence of both vacancies and self interstitials differ significantly from those for vacancies only, but have the same general form. Consideration of the effects of mobile inert gas atoms as well as vacancies and self interstitials on void nucleation rates requires a much different formalism, which considers multiple nucleation paths. The critical point-nodal line theory of Poincaré is used to identify the probable paths of activation and thereby greatly simplify the calculation. The resulting predicted void nucleation rates are found in reasonable agreement with experimental results.

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