Titanium is elemental, titanium alloys are mixtures. Therefore, titanium alloys have more diverse properties and more widely used.

Titanium alloy concept definition: titanium as a base to add other alloy elements of the alloy called titanium alloy. Titanium alloy is an ideal structural material for aerospace engineering because of its low density, high specific strength, good corrosion resistance and technological properties.

Scope of research: Titanium alloys can be divided into structural titanium alloys and heat resistant titanium alloys, or α titanium alloys, β titanium alloys and α+β titanium alloys. The research scope also includes titanium alloy forming technology, powder metallurgy technology, rapid solidification technology, titanium alloy military and civilian, etc.

Titanium alloy is a new type of structural material, it has excellent comprehensive properties, such as small density (~4.5g·cm-3), high specific strength and fracture toughness, fatigue strength and crack propagation resistance, good low temperature toughness, excellent corrosion resistance, some titanium alloy the highest working temperature of 550? C) Expected to reach 700? C. Therefore, it is increasingly widely used in aviation, aerospace, chemical industry, shipbuilding and other industrial sectors, developing rapidly. In light alloys, steels, etc., the ratio of σ0.2/ density to temperature is higher in titanium alloys than in other light metals, steels and nickel alloys, and this advantage can be maintained up to 500? C, therefore some titanium alloys are suitable for the manufacture of gas turbine components. About 80% of titanium production is used in the aerospace industry. For example, about 21 percent of the body structure of the U.S. B-1 bomber is made of titanium alloy, which is used to make the fuselage, wings, skin and load-bearing components. The f-15's body is made of 7,000kg of titanium alloy, accounting for 34% of its structural weight. About 5% of the Boeing 757's structural components are made of titanium, which uses 3,640 kg. Mc-donnell-dounlas's DC10 uses 5,500kg of titanium, more than 10% of its structural weight. The amount of titanium used in chemistry and general engineering: about 15% of its production in the US and about 40% in Europe. Due to the excellent corrosion resistance, good mechanical properties and qualified histocompatibility of titanium and its alloy, it is used to make biological materials such as prosthetic devices.