Microstructures in Ti-Al intermetallic compounds irradiated at 673 K in HFIR

Four kinds of Ti-Al intermetallic compounds were made from powder metallurg ical processing using mechanical alloying or plasma rotating electrode proc essing. One consisted of alpha (2)-Ti3Al single phase, and the others consi sted of alpha (2)-Ti3Al and gamma -TiAl duplex phases. These intermetallic compounds were irradiated at 673 K to the fluence of 5.16x10(25) n/m(2) (E> 1 MeV) in the high flux isotope reactor. After irradiation, transmission el ectron microscopy was carried out. Cavities were observed in both the alpha (2)-Ti3Al- and gamma -TiAl-phases. The nucleation behavior of cavities in the alpha (2)-Ti3Al- and gamma -TiAl-phases was influenced by chemical comp osition and fabrication processes. (C) 2000 Elsevier Science B.V. All right s reserved.