What are the advantages and disadvantages of titanium alloy?
Advantages：
1. High strength. The density of titanium alloy is generally around 4.51g/ cm3, which is only 60% of that of steel.
2, high thermal strength, the use temperature is several hundred degrees higher than the aluminum alloy, in the medium temperature can still maintain the required strength, can work in the temperature of 450 ~ 500℃ for a long time, the two types of titanium alloy in the range of 150℃ ~ 500℃ still have a high specific strength, and aluminum alloy at 150℃ specific strength decreased significantly.The working temperature of titanium alloy can reach 500℃, while that of aluminum alloy is below 200℃.
3. Good corrosion resistance. Titanium alloy works in humid atmosphere and seawater medium, and its corrosion resistance is far better than stainless steel;Especially strong resistance to pitting corrosion, acid corrosion and stress corrosion;To alkali, chloride, chlorine organic goods, nitric acid, sulfuric acid and other excellent corrosion resistance.But titanium has poor corrosion resistance to reducing oxygen and chromium salt media.
4. Good low temperature performance. Titanium alloy can still maintain its mechanical properties at low and ultra-low temperatures.Titanium alloys with good low temperature performance and very low interstitial elements, such as TA7, can maintain a certain degree of plasticity at -253℃.Therefore, titanium alloy is also an important low temperature structural material.
5. High chemical activity, high chemical activity of titanium, and strong chemical reaction with O, N, H, CO, CO2, water vapor, ammonia in the atmosphere.
The thermal conductivity of titanium = 15.24w/(m.K) is about 1/4 of that of nickel, 1/5 of that of iron, and 1/14 of that of aluminum. The thermal conductivity of various titanium alloys is about 50% lower than that of titanium.
Disadvantages：
1. Titanium and titanium alloys are mainly limited by their poor chemical reactivity with other materials at high temperatures.This property forces titanium alloys to differ from conventional refining, melting and casting techniques, often resulting in mold damage.
2. The price of titanium alloy has become very expensive.As a result, they were initially used mostly in aircraft structures and aircraft, as well as in high-tech industries such as the petroleum and chemical industries.