The Role Of Titanium Alloy, Properties, Characteristics?

Titanium alloy is widely used in various fields because of its high strength, good corrosion resistance and high heat resistance. Many countries in the world have realized the importance of titanium alloy materials, and have carried on research and development, and got practical application. In the 1950s and 1960s, it mainly developed high temperature titanium alloy for aeroengine and structural titanium alloy for body. In the 1970s, a batch of corrosion resistant titanium alloy was developed. Since the 1980s, corrosion resistant titanium alloy and high strength titanium alloy have been further developed. Titanium alloy is mainly used to make aircraft engine compressor parts, followed by rockets, missiles and high-speed aircraft structural parts.

High strength

The density of titanium alloy is generally about 4.5g/cm3, only 60% of steel, the strength of pure titanium is close to the strength of ordinary steel, some high strength titanium alloy exceeds the strength of many alloy structural steel. Therefore, the specific strength (strength/density) of titanium alloy is much higher than that of other metal structural materials, as shown in Table 7-1. It can produce components with high unit strength, good rigidity and light weight. At present, titanium alloy is used for engine components, skeleton, skin, fasteners and landing gear.

High thermal strength

The use of temperature is several hundred degrees higher than aluminum alloy, at moderate temperature can still maintain the required strength, can work in 450 ~ 500℃ temperature for a long time these two types of titanium alloy in the range of 150℃ ~ 500℃ still has a high specific strength, and aluminum alloy at 150℃ than the strength decreased significantly. The working temperature of titanium alloy can reach 500℃, and that of aluminum alloy is below 200℃.

Good resistance to corrosion

The corrosion resistance of titanium alloy is much better than that of stainless steel when working in humid atmosphere and seawater medium. Resistance to pitting corrosion, acid corrosion, stress corrosion is particularly strong; Excellent corrosion resistance to alkali, chloride, chlorine organic articles, nitric acid, sulfuric acid and so on. But titanium has poor corrosion resistance to reducing oxygen and chromite medium.

Good low temperature performance

Titanium alloy can keep its mechanical properties at low temperature and ultra low temperature. Titanium alloys with good low temperature performance and very low clearance elements, such as TA7, can maintain certain plasticity at -253℃. Therefore, titanium alloy is also an important low temperature structural material.

Chemically active

Titanium has high chemical activity, and has strong chemical reaction with O, N, H, CO, CO2, water vapor and ammonia in the atmosphere. When the carbon content is greater than 0.2%, hard TiC will be formed in titanium alloy. When the temperature is higher, the action with N will also form TiN titanium alloy products

Hard surface layer; Above 600℃, titanium absorbs oxygen to form a hard layer with high hardness. When hydrogen content increases, embrittlement layer will also be formed. The depth of hard brittle surface produced by gas absorption can reach 0.1 ~ 0.15mm, and the hardening degree is 20% ~ 30%. Titanium chemical affinity is also large, easy to friction surface adhesion phenomenon.

Small thermal conductivity, small elastic modulus

The thermal conductivity of titanium λ=15.24W/ (m.K) 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 that of titanium. The elastic modulus of titanium alloy is about 1/2 of steel, so its rigidity is poor, easy deformation, should not make slender rod and thin wall parts, cutting the processing surface of the springback is very large, about 2 ~ 3 times of stainless steel, resulting in severe friction, adhesion, adhesion wear of the tool surface

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