Titanium alloy material is most suitable for aerospace
High-toughness titanium alloy: the most successful example in this regard is the United States developed α + β two-phase high strength and toughness titanium alloy Ti62222S, the material has a good combination of strength and plasticity, room temperature rupture strength and yield strength were greater than 1300MPa and 1200MPa, and its high temperature performance is also very good. In addition, Ti62222S also has higher fracture toughness and damage tolerance. Ti6Al4V can substitute Ti6Al4V for its equivalent fatigue crack growth rate and superior to the alloy's elastic modulus and superplasticity.
High-temperature titanium alloy: Ultrasonic cruise bombs, hypersonic cruise bombs, reusable carriers, and sub-orbital re-use of cross-stratified aircraft research and development requires the titanium alloy must be used at 600 and above high temperature, which requires titanium alloy must have excellent high temperature performance. The world's first high temperature titanium alloy developed by the United States Ti6Al4V, can be used at 300 ~ 350. Ti6Al4V alloy both α + β two-phase characteristics, in the field of aerospace has been widely utilized. In order to maximize the Al solid solution heat-strengthening effect, elements such as Sn, Zr, Mo and Si are also added to the titanium alloy, and IMI679 and Ti6242 alloys having an operating temperature of 450 ° C have been developed successively, using IMI685 at 500 ° C, Ti6242S and other alloys, the use of temperature 550 ~ 600 ℃ IMI834, Ti1100, BT36 and other alloys.
Low Temperature Titanium Alloy: With the rapid development of space technology, the application of titanium alloy in low temperature and very low temperature environment has become more and more important. The development of low temperature titanium alloy is extremely weighty. The study found that by reducing the H, O, N and other interstitial elements, as well as Al content can improve the low temperature performance of titanium alloys, so that it can be long-term use in 20K temperature environment.
In addition to relying on the excellent structural design, the spacecraft works under the extreme conditions of ultra-high temperature, ultra-low temperature, high vacuum, high stress and strong corrosion, and depends on the excellent characteristics and functions of the material. Titanium alloy aerospace products will be set in one of the quality and known as the "universe metal", "space metal." Due to its superior strength, good mechanical properties and good corrosion resistance, titanium alloy is the ideal material for aircraft and engine. Owing to its poor machinability, titanium alloy has long restricted its application. With the development of processing technology, in recent years, titanium alloy has been widely used in the manufacture of aircraft engine compressor section, engine hood, exhaust and other parts of manufacturing and aircraft frame frames and other structural beams.
