Properties Of Titanium Alloy

Titanium alloys are alloys based on titanium with other elements added.

Characteristics of titanium alloy:

1, high strength

The density of titanium alloy is generally about 4.51g/ cubic centimeter, and titanium alloy is only 60% of steel. The density of pure titanium is close to that of ordinary steel, and some high strength titanium alloy exceeds the strength of many alloy structural steels. 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, which can produce parts with high unit strength, good rigidity and light weight. Titanium alloy is used in aircraft engine components, skeleton, skin, fasteners and landing gear.

2, 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℃.

3, good corrosion resistance

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.

4, low temperature performance is good

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.

5, chemical activity

Titanium has high chemical activity, and has strong chemical reaction with O, N, H titanium alloy, CO, CO2, water vapor, ammonia and other gases 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, TiN hard surface layer can be formed by the interaction with N. 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.

6, small thermal conductivity elasticity

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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