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Abstract

The results of investigations into radiation-enhanced diffusion in alloys are only compatible with the predictions of the modified two interstitial model. According to this model, the migration activation energies of point defects decrease with increasing high energy particle flux. The migration activation energy of interstitials and vacancies is determined, as a function of the magnitude of the high energy particle flux, from measurements of radiation-enhanced self diffusion and of the radiation damage rate in nickel. It is shown that the dynamic steady state defect concentrations resulting from the chemical rate equations are artificial concentrations, which will not be achieved in finite times. Dynamic quasi-steady state concentrations of vacancies and interstitials and of interstitial clusters, resulting from the simple rate equations, agree with experimental data. Dislocations or large interstitial clusters, acting as sinks for point defects, cannot be treated using simple rate equations. The implications of these results for the formation of radiation-induced structures, swelling and irradiation creep are discussed.

Additional information

Authors: SCHÜLE W, JRC Ispra (IT)
Bibliographic Reference: Paper presented: International Conference on Radiation Materials Science, Alushta (SU), May 22-25, 1990
Availability: Available from (1) as Paper EN 35892 ORA
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