Abstract

Abstract By monitoring the rate of the Zener relaxation, in situ measurements of the dynamic concentration of point defects associated with the bombardment by fast neutrons at intermediate temperatures (0.3–0.4 Tm ) have been obtained for a Ag-30 at. % Zn alloy. Enhancements of the atomic mobility by factors ranging from 3 to over 104 were found in the temperature range studied (40°C to 160°C) for a flux of 6 × 1011 fast neutrons/cm2 ·sec. These enhancements are discussed in terms of a stationary state model for the defect supersaturation. Information about the emission of “free” defects by the cascades and the generation rate of dislocation sinks for these defects by cascade collapse has been derived. L'accélération de la mobilité atomique qui résulte de l'irradiation par des neutrons a été mesurée directement sous flux, dans un alliage Ag-30 at. % Zn, à l'aide de mesures de relaxation mécanique. Des facteurs d'accélération de 3 à 104 out été trouvés, à des températures de 0, 3–0,4 Tf , dans un flux de 6 × 1011 neutrons rapides/cm2 · sec. Ces résultats sont discutés dans le cadre des modèies qui décrivent l'état stationnaire de sursaturation dynamique de défauts. Des précisions sur l'émission de défauts “libres” par les cascades et sur l'efficacité des cascades en temps que puits s'en déduisent.

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