Aluminum alloy has become an indispensable key material in the aviation field due to its excellent properties such as lightweight, high strength, corrosion resistance, and easy processing. Its applications cover core components such as fuselage structures, power systems, and avionics equipment, and promote the development of aviation equipment towards lightweight and high-performance through continuous technological innovation. The following is a detailed explanation of specific application scenarios and technological advancements:

1、 Core application scenarios
Body structure material
Skin and frame: Aluminum alloy accounts for 60% -80% of commercial aircraft structural materials. For example, the Boeing 777 fuselage uses seven new types of aluminum alloys (including 7055-T7751, etc.), and the skin crack propagation rate is reduced by 40% through microalloying technology; The wing beams of Airbus A380 are made of 7055 aluminum alloy, resulting in a weight reduction of 635 kilograms per piece.
Landing gear system: 7050-T7451 aluminum alloy has a specific strength of 1.2 times that of steel. The landing gear of the US F-18 fighter jet uses 7150-T77511 alloy, which can withstand impact loads of 300 tons; The latest 7085-T7652 aluminum alloy extends the fatigue life of the landing gear to 10 cycles.
Fuel system: The fuel pipeline of Airbus A350 is made of 6061-T6 aluminum alloy, and the corrosion resistance is improved by three times through micro arc oxidation treatment on the inner wall; The 2219 aluminum alloy liquid oxygen storage tank has achieved wide temperature range service from -183 ℃ to 150 ℃, with a welding joint strength coefficient of 0.95.
Key components of the power system
Engine blades: 2618 aluminum alloy maintains a yield strength of 280MPa at a high temperature of 200 ℃, making it an ideal material for jet engine compressor blades; The GE9X engine uses 2195 aluminum lithium alloy fan blades, which increase the thrust to weight ratio by 15%.
Turbine disk and combustion chamber: The Rolls Royce Trent XWB engine turbine disk is made of injection molded 7090 alloy to achieve structural stability in high-temperature and high stress environments.
Avionics and Special Environmental Components
Space radiation protection: The support truss of the Hubble Telescope is made of 7075-T73 aluminum alloy, which maintains a corrosion rate of 10 ⁻⁹ mm/year in space radiation environment; The solar wing substrate of the core module of China's space station "Tianhe" uses 2198-T8 aluminum lithium alloy, which reduces weight by 18% while meeting the requirements of extreme space environments.
Low temperature propellant storage: The SpaceX Falcon 9 liquid oxygen storage tank is made of 2195 aluminum lithium alloy, with a 20% reduction in wall thickness while maintaining a pressure capacity of 35MPa; The 5-meter diameter body of the Long March 5 rocket is made of 2219 aluminum alloy, and the weld strength reaches 92% of the base material through double-sided friction stir welding technology.