Titanium alloy is a new structural material. It has excellent comprehensive properties, such as low density (~ 4.5g · cm-3), high specific strength and specific fracture toughness, good fatigue strength and crack propagation resistance, good low-temperature toughness and excellent corrosion resistance. The maximum working temperature of some titanium alloys is 550 ℃, which is expected to reach 700 ℃. Therefore, it has been widely used and developed rapidly in aviation, aerospace, chemical industry, shipbuilding and other industrial sectors.

Alloy concept definition: the alloy composed of titanium based and other alloy elements is called titanium alloy. Titanium alloy has the advantages of low density, high specific strength, good corrosion resistance and good process performance. It is an ideal structural material for aerospace engineering.

Research scope: titanium alloy can be divided into structural titanium alloy and heat-resistant titanium alloy, or α Type titanium alloy β Type titanium alloy and α+β Type titanium alloy. The research scope also includes titanium alloy forming technology, powder metallurgy technology, rapid solidification technology, military and civil use of titanium alloy, etc.

Titanium consumption in chemical and general engineering fields: the United States accounts for about 15% of its output and Europe accounts for about 40%. Titanium and its alloys are used to make biomaterials such as prosthesis devices because of their excellent corrosion resistance, good mechanical properties and qualified histocompatibility. Light alloy, steel, etc（ σ 0.2 / density) and temperature, the specific strength of titanium alloy is higher than that of other light metals, steel and nickel alloys, and this advantage can be maintained to about 500 ℃, so some titanium alloys are suitable for manufacturing gas turbine components. About 80% of titanium production is used in aviation and aerospace industry. For example, titanium alloy accounts for about 21% of the airframe structural materials of B-1 bomber in the United States, which is mainly used to manufacture airframe, wing, skin and load-bearing components. The body structure material of F-15 fighter is 7000kg titanium alloy, accounting for about 34% of the structure weight. Titanium alloy accounts for about 5% of the structural parts of Boeing 757, and the consumption is 3640kg. The DC10 aircraft produced by MC Donnell Douglas uses 5500kg titanium alloy, accounting for more than 10% of the structural weight.