Titanium alloy is a matrix of titanium with various alloying elements such as aluminum, vanadium, molybdenum and iron added, which is a kind of high-performance metal material. It has rapidly made its way into the aerospace industry since bar production became feasible in the 1950s because its overall properties were far better than those of traditional metal materials, and it has now become the irreplaceable core material in the aerospace industry. Titanium alloys also have excellent corrosion resistance, good fatigue properties, and are heat treatable when compared to traditional steel and aluminium alloys.
These core advantages enable them to accurately meet the stringent requirements of the aerospace industry for materials with "high performance, lightweight, and high reliability". Their irreplaceable position has been fully verified in long-term engineering practice and have become an important material support for promoting the iteration and upgrading of aerospace technology.
In aerospace structural design, the selection of materials should not only meet the ultimate strength requirements, but also take into account lightweight, safety, and long-term reliability. These three core requirements directly determine the flight performance, range, payload capacity, and service life of aerospace equipment, and are key considerations in aerospace engineering design. Although traditional steel has high strength, its density is too high (about 7.85g/cm ³). If widely used in aviation equipment, it will significantly increase the weight of the fuselage, thereby reducing the range and effective load capacity of the equipment, increasing fuel consumption, and not in line with the development trend of "lightweighting" in the aerospace industry; Although aluminum alloy can achieve the goal of lightweighting well (with a density of about 2.7g/cm ³), its strength and high temperature resistance have obvious shortcomings. It is prone to deformation and performance degradation in high temperature environments, and cannot meet the long-term use requirements of core load-bearing components such as aircraft engines and landing gear. And titanium alloy perfectly compensates for the shortcomings of both, with a density of about 4.5g/cm ³, only 60% of steel, but a tensile strength of 800-1200MPa, close to or even exceeding some high-strength steels. This unique characteristic of "light and strong" makes it an ideal material for aircraft structural components, engine core components, and fastening systems, and a key breakthrough in achieving a balance between lightweight and high-performance aviation equipment.
Among numerous titanium alloy grades, different types of titanium alloys have their own emphasis on performance due to differences in composition ratios, and are suitable for different application scenarios in the aerospace industry. Among them the most popular and technically mature alpha+beta titanium alloy for application in aerospace is the ASTM Grade 5(Ti-6Al-4V). The alcohol content is 6 % alomuminum, 4 % vanadium and the rest titanium. This scientific proportion in the alloy ensures high strength of the material at the same time let good plasticity and processing performance for meet processing needs of complex parts. Currently, it has been widely used in key parts such as aircraft landing gear, wing connectors, engine compressor blades, casings, and fuselage frames.
According to statistics, in the new generation of civil aircraft such as Boeing 787 and Airbus A350, the amount of Ti-6Al-4V alloy used accounts for more than 70% of the total amount of titanium alloy used in the fuselage. Its excellent comprehensive performance effectively improves the flight safety and economy of the aircraft; In the key connecting parts of the landing gear and engine suspension of China's C919 large passenger aircraft, this grade of titanium alloy is also widely used, which can withstand the huge impact force during takeoff and landing and the alternating load during long-term service, providing a solid guarantee for flight safety.In addition, Ti-5Al-2. 5Sn and other α titanium alloys are utilized for cold section compressor parts in aircraft engines because of high temperature and oxidation resistances; Ti-10V-2Fe-3Al and other β -type titanium alloys are widely applied to aircraft fuselage skins and complex shape structural components as a result of good plasticity, high strength and easy processing and forming, thus further demonstrating the potential application of titanium alloy in aerospace field.
Furthermore, titanium alloys can keep stable performance at high temperature and complex environment, which is especially important for aircraft engines. As the "heart" of aviation equipment, the working environment of aircraft engines is extremely harsh. The main parts of the equipment have to be run continuously and for a long time in the complex environment of high temperature, high pressure, high humidity and high corrosion, resulting in very high requirements for materials in anti-oxidation and anti-creep, and also directly affect the life and operation security of the engine. The creep and oxidation resistance of titanium alloys are considerably superior to those of aluminium alloys.
The mechanical properties of aluminum and its alloys degrade rapidly in environments exceeding 250 ℃, thus they cannot be used stably for a long term. But titanium alloys need not only be expected to operate in the range of 300-500 ℃ for long periods, but also in some high temperature resistant titanium alloys(e.g. Ti-6Al-2Sn-4Zr-2Mo)for short periods of time even at 600 ℃. Their creep resistance is 3 to 5 times that of aluminum alloys. In the required creep test, at 500 ℃ for 100 h under test conditions, the creep strain of titanium alloy is less than 0.15%, which is an order of magnitude less than the creep strain (more than 1.5%) of aluminum alloy, this can effectively prevent the components from being deformed and damaged in the long term high temperature work. At the same time, a dense layer of titanium oxide film (the thickness is about 5-10nm) will be automatically generated on the surface of the titanium alloy, which can effectively block the corrosion of hostile media, such as air, water steam and fuel. Its corrosion resistance is superior to that of stainless steel, and it can also keep high performance stability in complicated environments, i.e. marine climate, high altitude strong ultraviolet, acidic and alkaline media which prevent the corrosion-induced failure of the component to a great extend, increase aircraft service by a big margin and reduce maintenance cost.
Humanization rating: 87% (Al content: 60%) Translate nowFrom the manufacturing point of view, titanium alloys can be processed using the methods of hot working, cold working, machining, welding, 3D printing and so on. The above processing methods meet the stringent requirements of the aviation industry on 3D complex structural components, high precision parts and high consistency products, making the possibility of the batch and refined manufacturing of aerospace parts. Titanium alloy forgings density can reach above 99.8%,which can thoroughly clean up defects like pores and cracks inside the material, and enhance the strength and reliability of the parts significantly. The density of titanium alloy forgings can reach over 99.8%, effectively eliminating defects such as pores and cracks inside the material, significantly improving the strength and reliability of the components. It is commonly used in the manufacture of core components such as aircraft landing gear and engine turbine discs that withstand high loads; Titanium alloy rolled plates and profiles are widely used in fuselage skin, wing leading edge and other parts, which can meet the requirements of lightweighting and forming of components; Precision machining technology can achieve high-precision dimensional control of titanium alloy components, ensuring assembly accuracy between components; In recent years, the rapidly developing 3D printing technology has broken the limitations of traditional processing techniques and can directly manufacture titanium alloy structural parts with complex shapes. This not only shortens the production cycle but also reduces material waste and manufacturing costs. Currently, it has been applied in the production of components such as satellite brackets and complex engine pipelines.
In summary, titanium alloys, with their high specific strength, excellent high temperature resistance, corrosion resistance, good fatigue performance, and processability, perfectly meet the demanding requirements of the aerospace industry and play an irreplaceable role in key parts such as fuselage structures, aircraft engines, and fastening systems. It is not only the core material in the aerospace material system, supporting the development of aerospace equipment towards lightweight, high-performance, and long-life, but also represents the technological direction of high-end manufacturing industry. Its application level directly reflects the development strength of a country's aerospace industry and high-end material industry. In the future, with the continuous upgrading of processing technology, the application of titanium alloys in the aerospace field will be more extensive and in-depth.
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