First of all, titanium alloys have the following characteristics

1.The characteristic strength of titanium is high: 1.3 times of aluminum alloy, 1.6 times of magnesium alloy.

2.High thermal strength: the use temperature is several hundred degrees higher than aluminum alloy, and it can work for a long time at a temperature of 450 ~ 500 ° C.

3.Good corrosion resistance: acid resistance, alkali resistance, atmospheric corrosion resistance, pitting corrosion, stress corrosion resistance is particularly strong.

4.Good low temperature performance: Titanium alloy TA7 with very low gap elements can maintain a certain plasticity at -253 ° C.

5.High chemical activity: high chemical activity at high temperature, easily react with gas impurities such as hydrogen and oxygen in the air to generate a hardened layer.

6.The thermal conductivity is small, the elastic modulus is small: the thermal conductivity is about 1/4 of nickel, 1/5 of iron, 1/14 of aluminum, and the thermal conductivity of various titanium alloys is about 50% lower than the thermal conductivity of titanium

The elastic modulus of titanium alloy is about 1/2 that of steel.Titanium alloy according to the use can be divided into: heat resistant alloy, high strength alloy, corrosion resistant alloy (titanium-molybdenum, titanium-palladium alloy, etc.), low temperature alloy and special function alloy (titanium-iron hydrogen storage material, titanium-nickel memory alloy).

Although the history of titanium and its alloys is not long, it has won a number of honorable titles because of its extraordinary properties.First won the title is "space metal", it is light weight, specific strength and high temperature resistance, especially suitable for the manufacture of aircraft and various spacecraft.

At present, about three-quarters of the world's production of titanium and titanium alloys are used in the aerospace industry.Many parts originally made of aluminum alloy have been converted to titanium alloy.Aerospace applications of titanium alloysTitanium alloy is mainly used in aircraft and engine manufacturing materials, such as forged titanium fans, compressor discs and blades, engine covers, exhaust devices and other parts of the aircraft girder frame and other structural frame.The spacecraft mainly uses the high specific strength, corrosion resistance and low temperature resistance of titanium alloy to manufacture various pressure vessels, fuel tanks, fasteners, instrument straps, frames and rocket shells.Artificial Earth satellites, lunar modules, manned spacecraft and space shuttles also use titanium alloy plate welds.

Why do titanium alloys have to be used in materials for air transport aircraft?The top speed of modern aircraft has reached 2.7 times the speed of sound.Flying at supersonic speeds that fast would cause the plane to rub against the air and generate a lot of heat.When the flight speed reaches 2.2 times the speed of sound, the aluminum alloy can not withstand, must use high temperature resistant titanium alloy.When the thrust-weight ratio of the aero engine is increased from 4 to 6 to 8 to 10, and the compressor outlet temperature is correspondingly increased from 200 to 300 ° C to 500 to 600 ° C, the original low-pressure compressor disc and blade made of aluminum must be changed to titanium alloy.

In recent years, scientists have made new progress in the study of titanium alloy properties.The original titanium alloy composed of titanium, aluminum and vanadium has a maximum working temperature of 550 ° C ~ 600 ° C, and the newly developed aluminum titanide (TiAl) alloy has a maximum working temperature of 1040 ° C.Using titanium alloy instead of stainless steel to make high-pressure compressor discs and blades can reduce the weight of the structure.For every 10 percent reduction in weight, the plane saves 4 percent in fuel.

At present, the consumer electronics industry represented by mobile phones is very fierce competition, and the head manufacturers all hope to improve the premium ability of products by titanium alloy.In general, titanium alloys have the advantages of high specific strength and lightweight to become an important reason for promotion, which can make consumer electronics lighter, and the consumer experience will be more comfortable.

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