(1) high strength
Titanium alloy density is generally about 4.5g / cm3, only 60% of steel, pure titanium strength is close to the strength of ordinary steel, some high-strength titanium alloy than the strength of many alloy structural steel. Therefore, the specific strength (strength / density) of titanium alloy is much larger than that of other metal structure materials. See Table 7-1. It can produce zero parts with high strength, good rigidity and light weight. At present the aircraft engine components, skeleton, skin, fasteners and landing gear and so on are using titanium alloy.
In the case of
(2) high thermal strength
The use of temperature than aluminum alloy several hundred degrees, at moderate temperatures can still maintain the required strength, can be 450 ~ 500 ℃ temperature long-term work These two types of titanium alloy in the range of 150 ℃ ~ 500 ℃ is still very high Specific strength, while the aluminum alloy at 150 ℃ when the specific strength decreased significantly. Titanium alloy operating temperature up to 500 ℃, aluminum alloy at 200 ℃ below.
(3) good corrosion resistance
Titanium alloy in the humid atmosphere and sea water medium work, its corrosion resistance is much better than stainless steel; pitting corrosion, acid corrosion, stress corrosion resistance is particularly strong; alkali, chloride, chlorine organic products, nitric acid, sulfuric acid And so have excellent corrosion resistance. But titanium has a reducing oxygen and chromium salt medium corrosion resistance is poor.