TIAL-BASED ALLOYS HAVING IMPROVED CREEP STRENGTH BY STRENGTHENING OF GAMMA PHASE

摘要

A TiAl-based alloy having an excellent high-temperature creep strength are provided. According to one embodiment, the TiAl-based alloy comprises, in atomic percent, about 42.5 % to about 45.5 % aluminum (Al), about 8.0 % to about 15.0 % niobium (Nb), about 0.3 % to about 0.8 % carbon (C), about 0.3 % to about 0.9 % silicon (Si), balance titanium (Ti) and incidental impurities. A method of producing an article comprising the step of casting the TiAl-based alloy, and an article made from the TiAl-based alloy are also provided.