Abstract
The microstructure of V– XFe alloys ( X=0, 2, 5 and 7 at.%) irradiated as thin foils at 625°C with 50 KeV V + ions to damage doses ranging from 2.5 to 40 dpa at averaged dose rate of 5 × 10 −3 dpa/s has been investigated. Data on mean void diameter, void number density, void volume fraction (Δ V/ V) and total dislocation length per unit volume have been obtained. From these data the sink strengths for voids and dislocations were found and the void swelling bias factor (SBF) as a function of iron content was determined. Both Δ V/ V and SBF reveal maxima at about 5 at.% Fe. For an interpretation of a decrease in Δ V/ V and SBF at iron contents above 5 at.%, in the present work, the model developed previously is generalized to account for the diffusivity dependence on alloy composition.
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