THE PHASE EVOLUTION, CREEP AND TENSILE BEHAVIOR OF TWO-PHASE ORTHORHOMBIC TITANIUM ALLOYS

摘要

The phase evolution, creep, and tensile behavior were studied for near TiaAINb and Til2Al-38Nb Of BCC alloys. Monolithic materials were produced through conventional thennomechanical processing techniques. Heat treatment and TEM studies estimated the temperature ranges for the respective phase fields and a pseudo binary diagram based on Ti=S0at% was constructed. The aging-transformation behavior was studied in detail. O-phase precipitation within BCC-dominated microstructures resulted in significant room-temperature (RT) strengthening. The BCC phase was vital for imparting RT ductility.