Differences between titanium and titanium alloys

Titanium is a simple substance and titanium alloy is a mixture. Therefore, titanium alloys have more properties and wider applications.

Definition of titanium alloy concept: an alloy composed of titanium as the base and other alloy elements is 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 good processing properties.

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

Titanium alloy is a new type of 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 growth resistance, good low-temperature toughness, and excellent corrosion resistance. The maximum working temperature of some titanium alloys is 550? C. Expected to reach 700? C。 Therefore, it has been widely used in aviation, aerospace, chemical industry, shipbuilding and other industrial sectors, with rapid development（ σ 0.2/density) and temperature. The specific strength of titanium alloy is higher than that of other light metals, steels and nickel alloys, and this advantage can be maintained to 500? C, so some titanium alloys are suitable for manufacturing gas turbine components. About 80% of titanium output is used in aviation and aerospace industry. For example, titanium alloy accounts for about 21% of the airframe structural materials of the B-1 bomber in the United States, which is mainly used to manufacture the airframe, wing, skin and load-bearing components. The amount of titanium alloy used for the airframe structure material of F-15 fighter is 7000kg, accounting for 34% of the structure weight. Titanium alloy accounts for about 5% of the structural parts of Boeing 757 passenger aircraft, with the consumption of 3640 kg. DC10 aircraft produced by Mc Donnell Douglas Company uses 5500kg titanium alloy, accounting for more than 10% of the structure weight. 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 have excellent corrosion resistance, good mechanical properties, and qualified tissue compatibility, which make it used to make biomaterials such as prosthetic devices.