Abstract
The microstructures of VTi, VCrTi, and VTiSi alloys were characterized by transmission electron microscopy after neutron irradiation in the Fast Flux Test Facility (FFTF) at 420 and 600°C up to 114 dpa. Two types of irradiation-induced precipitates were identified, i.e., Ti 2O and Ti 5(Si,P) 3. Thermal precipitates of Ti(O,N,C) were also observed in all unirradiated and irradiated specimens. Copious precipitation of the Ti 5(Si,P) 3 phase was associated with superior resistance to void swelling. In specimens with significant swelling, Ti 5(Si,P) 3 precipitation was negligible. Ductility is significantly reduced when the precipitation of Ti 2O and Ti 5(Si,P) 3 is pronounced. These observations indicate that initial composition, fabrication processes, and irradiation-induced precipitation are interrelated and are important factors to consider in developing an optimized alloy.
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