[en] Titanium aluminides (Ti₃Al and TiAl) have received considerable attention as potential low density, high strength and creep resistant materials for high-temperature applications. For years, significant progress in improving the ambient temperature properties have been made, but the application temperature of these alloys is limited to less than 1,000 C for their relatively low high-temperature strength and poor oxidation resistance. Additions of niobium are known to increase the liquidus temperature and improve the properties of TiAl alloys. The needs for improving the limiting temperature of high-temperature structural materials are widespread. With a view to possible development of advanced intermetallic alloy for use above 1,000 C, a systematic study has been performed in the authors research group on the phase diagram, crystallographic structures, and oxidation and mechanical behavior of Ti-Al-Nb ternary alloys. The present paper is primarily concerned with the development of new Ti-Al-Nb intermetallic alloys based on their fundamental studies, which will be briefly reviewed here