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Performance advantages of titanium alloy

Nov 08, 2018

Performance advantages of titanium alloy

1, high intensity

The density of titanium alloy is generally about 4.5g/cm3, which is only 60% of steel. The strength of pure titanium is close to that of ordinary steel. Some high-strength titanium alloys exceed the strength of many alloy structural steels. Therefore, the specific strength (strength/density) of titanium alloy is much larger than that of other metal structural materials. See Table 7-1, it can produce zero-components with high unit strength, good rigidity and light weight. At present, titanium alloys are used for aircraft engine components, skeletons, skins, fasteners and landing gear.

2, high heat intensity

The use temperature is several hundred degrees higher than that of aluminum alloy, and can maintain the required strength at moderate temperature. It can work for a long time at 450~500 °C. These two types of titanium alloys are still high in the range of 150 °C ~ 500 °C. Specific strength, while the specific strength of aluminum alloy at 150 ° C is significantly reduced. Titanium alloys can operate at temperatures up to 500 ° C and aluminum alloys at temperatures below 200 ° C.

3, good corrosion resistance

Titanium alloy works in moist atmosphere and seawater medium, and its corrosion resistance is much better than that of stainless steel; it is especially resistant to pitting, acid etching and stress corrosion; organic matter to alkali, chloride and chlorine, nitric acid, sulfuric acid Such as excellent corrosion resistance. However, titanium has poor corrosion resistance to a medium having a reducing oxygen and a chromium salt.

4, good low temperature performance

Titanium alloys retain their mechanical properties at low and ultra-low temperatures. Titanium alloys with good low-temperature properties and extremely low interstitial elements, such as TA7, retain a certain degree of plasticity at -253 °C. Therefore, titanium alloy is also an important low temperature structural material.

5, chemically active

Titanium has a large chemical activity and produces strong chemical reactions with O, N, H, CO, CO2, water vapor, and ammonia in the atmosphere. When the carbon content is more than 0.2%, hard TiC is formed in the titanium alloy; when the temperature is high, the TiN hard surface layer is formed by the action of N; when it is above 600 ° C, the titanium absorbs oxygen to form the hard layer with high hardness. When the hydrogen content rises, an embrittlement layer is also formed. The hard and brittle surface layer produced by absorbing gas can reach a depth of 0.1 to 0.15 mm and a degree of hardening of 20% to 30%. Titanium also has a large chemical affinity and is liable to adhere to the friction surface.

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