Titanium alloy is a new type of structural material, which has excellent comprehensive properties, such as low density (~4.5g · cm-3), high specific strength and specific fracture toughness, good fatigue strength and crack growth resistance, good low-temperature toughness, and excellent corrosion resistance. The maximum operating temperature of some titanium alloys is 550 ℃, which is expected to reach 700 ℃. Therefore, it has been increasingly widely used in industries such as aviation, aerospace, chemical, shipbuilding, and has developed rapidly.
Definition of alloy concept: An alloy composed of titanium as the base and other alloying elements is called a titanium alloy. Titanium alloy has the advantages of low density, high specific strength, good corrosion resistance, and good process performance, making it an ideal structural material for aerospace engineering.
Research scope: Titanium alloys can be divided into structural titanium alloys and heat-resistant titanium alloys, or α Type titanium alloy β Type titanium alloy and α+β Type titanium alloy. The research scope also includes the forming technology of titanium alloys, powder metallurgy technology, rapid solidification technology, and the military and civilian use of titanium alloys.
The amount of titanium used in the chemical and general engineering fields: the United States accounts for about 15% of its production, while Europe accounts for about 40%. Because of its excellent corrosion resistance, good mechanical properties, and qualified Histocompatibility, titanium and its alloys are used to make biomaterials such as prosthetic devices.
Light alloy, steel, etc（ σ 0.2/density) and temperature. The specific strength of titanium alloy is higher than that of other light metal, steel and nickel alloys, and this advantage can be maintained to about 500 ℃. Therefore, some titanium alloys are suitable for manufacturing gas turbine components. Approximately 80% of titanium production is used in the aviation and aerospace industries. For example, titanium alloy accounts for about 21% of the structural materials of the B-1 bomber in the United States, mainly used for manufacturing the fuselage, wings, skin, and load-bearing components. The structural material of the F-15 fighter body is made of titanium alloy with a dosage of up to 7000kg, accounting for approximately 34% of the structural weight. The structural components of the Boeing 757 aircraft consist of approximately 5% titanium alloy, with a usage of 3640kg. The DC10 aircraft produced by McDonnell Douglas uses 5500kg of titanium alloy, accounting for over 10% of the structural weight.
