Abstract
Swelling behavior and microstructural evolution of V-Ti, V-Cr-Ti, and V-Ti-Si alloys were investigated after irradiation at 420–600°C up to 114 dpa. The alloys exhibited swelling maxima between 30 and 80 dpa and swelling decreased on irradiation to higher dpa. This is in contrast to the monotonically increasing swelling of binary alloys that contain Fe, Ni, Cr, Mo, and Si. Precipitation of dense Ti 5Si 3 promotes good resistance to swelling of the Ti-containing alloys, and it was concluded that Ti of > 3 wt% and 400–1000 wppm Si are necessary to effectively suppress swelling. Swelling was minimal in V-4Cr-4Ti, identified as the most promising alloy based on good mechanical properties and superior resistance to irradiation embrittlement. V-20Ti doped with B exhibited somewhat higher swelling because of He generation. Lithium atoms, generated from transmutation of 10B, formed γ-LiV 2O 5 precipitates and did not seem to produce undesirable effects on mechanical properties.
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