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Immersion density measurements have been performed on a series of titanium alloys irradiated in EBR-II to a fluence of 5 × 1022n/cm2 (E >0.1 MeV) at 450 and 550°C. The materials irradiated were the near-alpha alloys Ti-6242S and Ti-5621S, the alpha-beta alloy Ti-64, and the beta alloy Ti-38644. Swelling was observed in all alloys with the greater swelling being observed at 550°C. Microstructural examination revealed the presence of voids in all alloys. Ti-38644 was found to be the most radiation resistant. Ti-6242S and Ti-5621S also displayed good radiation resistance, whereas considerable swelling and precipitation were observed in Ti-64 at 550°C.
swelling, titanium alloys, neutron irradiation, microstructure, fusion reactor materials
Engineer, Westinghouse Hanford Company, Richland, Washington