Abstract:A more complex structural component with small size and very thin walls and blades used for advanced aircraft engine was fabricated well by induction skull melting and centrifugal investment casting with a proper ceramic mold. The tensile elongation and ultimate strength of the hotisostatically pressed (HIPped) Ti-46.5Al-2.5V-1Cr (mole fraction, %) ca sting alloy s are up to 2.5% and 645MPa at room temperature, and 31% and 593MPa a t 800℃. The fracture roughness at room temperature is up to 28MPa·m^1/2. The endurance tensile strength at 800℃ for 150h, is higher than 200MPa. The high cycle rotary bending fatigue strengths for 1×10⁷ cycles at room temperature and 800℃ a re 412MPa and 270MPa, respectively.

Key words: TiAl alloy; mechanical properties; microstructure; investment cast; components