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Aluminum Alloy Materials On Aircraft

Aluminum Alloy Materials On Aircraft

2021.04.23

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The alloy materials on the aircraft mainly include aluminum alloy, magnesium alloy, and titanium alloy. Among them, aluminum alloy materials account for about 50%-70% of aircraft materials, and magnesium alloy materials account for about 5%-10% of aircraft materials. In the aircraft, the proportion of titanium alloy is increasing.

7075 aluminum in factory.jpg7075 aluminum for aircraft.jpg

Aluminum is a kind of light metal with low density, high plasticity and easy processing. It can be made into various profiles and plates with good corrosion resistance.

Aluminum alloy has a series of advantages such as low density, high specific strength, good corrosion resistance and formability, and low cost. It has broad application prospects and irreplaceable status in aviation, aerospace, shipbuilding, nuclear industry and weapon industry.

In aviation, aluminum alloy is the main material for aircraft body structure.

In the early stages of development, in order to improve the mechanical strength of aluminum alloys, researchers successively developed alloys in 2014 and 2017, followed by 2024-T3 alloy, Al-Zn-Mg-Cu alloy 7075-T6, and later developed higher strength The 7178 is a T6 alloy.

However, 2024-T3 and 7075-T6 alloys have a tendency of stress corrosion cracking in the short transverse direction. The stress corrosion problem of 7xxx series aluminum alloys was solved by the successful development of 7075-T73, and then the T76 state which can meet the corrosion resistance requirements to a certain extent at the sacrifice of lower strength was developed.

In general, aerospace aluminum alloys have made breakthroughs after the late 1980s. Foreign countries have successfully applied the latest generation of aerospace aluminum alloys to various new aircraft, and domestic research on these new alloys has just begun. The research and development of aerospace aluminum alloys should be closely focused on issues such as strength, stiffness, heat resistance, reliability, long life, weight reduction, and low-cost manufacturing technology.