Titanium is a single substance, titanium is a mixture. Therefore, titanium alloys have more diverse properties and a wider range of uses.
Titanium alloy concept definition: titanium alloy composed of other alloying elements is called titanium alloy. Titanium alloy has the advantages of low density, high specific strength, good corrosion resistance, good process performance, etc., and is 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 alloys, β type titanium alloys and α+β type titanium alloys. The research scope also includes titanium alloy forming technology, powder metallurgy technology, rapid solidification technology, military and civilian titanium alloy.
Titanium alloy is a new type of structural material, it has excellent comprehensive properties, such as small density (~4.5g·cm-3), specific strength and specific fracture toughness, fatigue strength and crack propagation resistance is good, low temperature toughness, excellent corrosion resistance, the highest working temperature of some titanium alloys is 550ºC, is expected to reach 700ºC. Therefore, it has been increasingly widely used in aviation, aerospace, chemical industry, shipbuilding and other industrial sectors, and has developed rapidly.
Light alloys, steel, etc. (σ0.2/ density) and the relationship between temperature, titanium alloy is higher than other light metals, steel and nickel alloys, and this advantage can be maintained to about 500ºC, so some titanium alloys are suitable for manufacturing gas turbine components. About 80% of titanium production is used in the aviation and aerospace industry. For example, in the body structure materials of the B-1 bomber in the United States, titanium alloy accounts for about 21%, which is mainly used to manufacture fuselage, wings, skin and bearing components. The amount of titanium alloy used in the body structure material of F-15 fighter jet is 7,000kg, accounting for about 34% of the weight of the structure. The structural parts of Boeing 757 passenger aircraft, titanium alloy accounts for about 5%, the amount of 3640 kg. The DC10 aircraft produced by McDonnell Douglas (Mc-Donnell-Dounlas) has a titanium alloy consumption of 5500kg, accounting for more than 10% of the weight of the structure. Titanium usage in chemical and general engineering fields: the United States accounts for about 15% of its production, and Europe accounts for about 40%. Due to the excellent corrosion resistance, good mechanical properties and qualified histocompatibility of titanium and its alloys, it is used in the production of prosthetic devices and other biological materials.