1) Ti-5A1-2.5Sn (TA7) alloy has a medium strength level (tensile strength around 80 kg·force/mm²) and sufficient ductility in the annealed state, and has good welding performance. It can be used as a structural material below 500℃. It can reach 900°C in short-term use. The tensile strength of its plates and bars at 350°C can reach 50 kg·force/mm²; the lasting strength after 100 hours can reach 45 kg·force/mm².
2) Ti-5A1-2.5Sn-3Cu-1.5Zr (TA8) This is an α+ compound alloy with precipitation hardening effect. It has high room temperature tensile strength (tensile strength above 100 kg·force/mm²) and good heat resistance, and can be used as a material for compressor blades and disks working at a temperature of 450°C. At this temperature, the tensile strength of the rod can reach 72 kg·force/mm²; the lasting strength after 100 hours can reach 70 kg·force/mm², and the changing strength can reach kg·force/mm².
3) Ti-6A1-0.6Cr-0.4Fe-0.4Si-0.01B (TC7) This is an α+β alloy with dispersed compound precipitation. At 500°C, the tensile strength of this alloy can reach 60 kg·force/room m2; and its welding performance is good. It is mainly used in the form of plates and bars for aircraft engine components below 500°C.
4) Ti-6.5A1-3.5Mo-2.5Sn-0.3Si (TC9) This is currently the better heat-resistant titanium alloy used at 450~500℃ in China. It has a high strength level: and has good high-temperature mechanical properties and thermal stability. The tensile strength at room temperature can reach about 110 kg·force/mm², and the tensile strength at 500°C remains at 85 kg. ·Force/mm² is around and the lasting strength after 100 hours can reach 62 kgf/mm². So this alloy can be used for a long time at 500C,
5) BT25 alloy This is a Ti-A|-Zr-Sn-Mo-W-i series deformation heat-resistant titanium alloy, which is a martensitic α+B two-phase titanium alloy. The alloy has been heat treated at 950~970°C for 1 hour, air cooling +560°C for 6 hours, and air cooling. The obtained mechanical properties at room temperature and the thermal stability at 500°C for 100 hours are the best. The tensile strength at room temperature is 105 kg·force/mm²; when the temperature is increased to 550°C, the tensile strength is approximately 80~85 kg·force/mm², and at 600°C it is 66~78 kg·force/mm². The fatigue limit of the cycle base 2X107: 50~52 kg·force/mm² at room temperature; 40~42 kg·force/mm² at 500°C. Heating at 450°C for 10,000 hours, heating at 500°C for 6,000 hours, and heating at 550°C for 3,000 hours all have satisfactory thermal stability, so this alloy can be used at 550°C. Moreover, it has good welding performance and process plasticity, making it an ideal material for manufacturing compressor components.
