The structure and properties of a Ti-25Al-10Nb-3V-1Mo alloy

This paper reports on six super α2 titanium aluminide pancakes produced by rapid omnidirectional compaction of prealloyed Ti-25Al-10Nb-3V-1Mo (at%) (Ti-14.1Al-19.5Nb-3.2V-2Mo (wt%)) powder. Various solution and aging heat treatments were investigated to yield the best combination of tensile and stress rupture properties. The β transus temperature was found to be about 1,090 degrees C (1,990 degrees F). The alloy was heat treated with four different schedules to develop various structure combinations of α2 and β and followed by a series of microstructural analyses and mechanical property determinations. The highest ultimate tensile strength and yield strength attained at room temperature were 1,174.9 and 977.7 MPa (170.4 and 141.8 ksi), respectively, for a specimen heat treated at 1,140 degrees C (2,084 degrees F) for 1 hr and aged at 816 degrees C (1,500 degrees F) for 4 hr + air cooling