High-strength aluminum alloy generally refers to aluminum alloy with yield strength above 500MPa, and the most common is the superhard aluminum of the 7 series. This series of aluminum alloy was originally developed in the context of aerospace applications, and has now developed into the main structural materials for military and civil aircraft in the world, accounting for 70-80% of the proportion of aircraft structural parts, and in many fields instead of expensive titanium alloys, becoming an indispensable important lightweight structural materials. With the continuous development of modern aerospace field, nuclear industry and transportation industry, higher requirements are put forward for the comprehensive performance of structural parts, and a new generation of ultra-high strength aluminum alloy with light weight, high strength, high toughness, high fracture toughness and stress corrosion resistance is undoubtedly the first choice.

Aluminum alloy, as a relatively mature lightweight high-strength alloy material, is used in aerospace, aluminum alloy materials are generally used as structural materials, and have higher specific strength and better processing properties than steel.

The aerospace field mainly develops high-strength, high-toughness and corrosion resistance aluminum tube aluminum square tube aluminum alloy material to meet the harsh conditions of aerospace use, the application is more 2000 series and 7000 series aluminum alloy, on the basis of high-strength aluminum alloy process improvement and material formula improvement, Through innovative production processes such as powder metallurgy and jet molding, lightweight aluminum alloy materials with better performance are developed, and related research on aluminum matrix composite materials and superplastic aluminum alloy materials is carried out.

In the development and application process of lightweight high-strength aluminum alloy, stress corrosion problem is the main problem in the entire application history of aluminum alloy, how to weaken or delay the stress corrosion problem in the use of high-strength aluminum alloy has become the main problem in the application process of aluminum alloy.

In the aerospace field, the main composition of 2000 series aluminum alloy is mainly aluminum (Al), copper (Cu) and magnesium (Mg), and the main composition of 7000 series aluminum alloy is Al, zinc (Zn), Mg and Cu. There are also some high-performance (high strength, high toughness, corrosion resistance) aluminum alloy materials obtained by adding some special elements. At present, the main method to obtain high performance aluminum alloy materials is to change the melting and casting conditions

2000 series aluminum alloy is mainly Cu as the main alloying element, aluminum alloy material to add the appropriate amount of Cu element prepared in the strength, heat resistance, processing performance will be better improved, but the corrosion resistance will be reduced, because the introduction of Cu element will make it easier to show intercrystalline corrosion inside the aluminum alloy, the material composition elements directly affect the performance of aluminum alloy. Therefore, the 2000 series aluminum alloy is generally coated with pure aluminum or 6000 series aluminum alloy on the surface as an electrochemical protective film of the main aluminum alloy to improve its corrosion resistance. Later, scholars have done a lot of research on the methods to improve the stress corrosion performance of different grades of aluminum alloy, which has delayed the degree of stress corrosion of aluminum alloy to a certain extent.

Aluminum alloy material is an important component material to ensure the safe flight of aircraft, the selection and performance prediction of aluminum alloy material in different parts is directly related to the safety and reliability of aircraft, and the failure of aluminum alloy material in aviation is directly related to life safety, which needs to be paid extensive attention to.

Aluminum square tube Aluminum square tube is mainly used in aerospace and military fields, because aerospace and military products have extremely high requirements for weight reduction, high specific strength materials are the preferred materials for aerospace, in aircraft aluminum, 7000 series of high strength and high toughness aluminum alloy and 2000 series of strong and high toughness aluminum alloy play an important role.

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