Titanium is a kind of metal with excellent performance and abundant reserves, which has the reputation of "modern metal". After half a century of development, the preparation technology and application research of titanium alloy have made great progress, and it is especially widely used in the field of aviation. However, some existing problems are gradually exposed. The further development of titanium alloy for aviation is faced with great challenges, which are mainly reflected in the following three aspects:
(1) Dosage. Whether in military or civilian aircraft, the amount of titanium alloy directly reflects the level of a country's aviation. At present, the titanium content of aircraft engines is low, and it is still very difficult to further increase to about 50%.
(2) Performance. Like other aviation structural materials, high performance is required to have a good performance match, that is, the mechanical properties, physical properties, chemical properties, process properties and defects control must be considered comprehensively. The creep resistance and the sharp decline of high temperature oxidation resistance of the existing titanium alloys above 600℃ are two major obstacles to the expansion of the application of titanium alloys.
In the whole development and application process of aviation titanium alloy technology, new manufacturing technology will be the focus of development and research, such as superplastic forming and other near-net processing, powder metallurgy forming method, etc.
(3) Cost. Although some achievements have been made in reducing the cost of aerospace titanium alloy, there are still many fields to be researched and developed. Taking flame-retardant titanium Alloy as an example, Alloy-C invented in America has excellent flame-retardant properties and high-temperature mechanical properties, but its high price is caused by the need to add a large number of expensive V and poor malleability, so it is only formally applied in F119 engine.
