In the field of aerospace, which pursues extreme performance, the choice of materials is crucial. Aluminum alloys are favored in the aerospace field with their excellent comprehensive performance. Among the rich series, 6000 series and 7000 series aluminum alloys are especially popular.
The 6000 series aluminum alloys use magnesium and silicon as the main alloying elements, and the6063 aluminum alloy is a typical representative of this series. The 6063 aluminum alloy sheets have medium strength, and its yield strength is generally between 110-200MPa.
Although its strength is not top-notch, it has excellent processing performance, is easy to perform processing operations such as extrusion and forging, and can be easily made into various complex shapes of parts.
This alloy also has excellent welding characteristics, and the welded joints are high in strength and have good sealing, which provides convenience for the assembly of aerospace components. Its electroplating performance is also very good, and it can form a uniform and dense coating on the surface, effectively improving the protective performance of the parts.
In terms of corrosion resistance, 6063 aluminum alloy performs well. This is due to its alloy composition and the oxide film naturally formed on the surface, which can effectively resist the erosion of the atmosphere, water vapor and some chemical substances, ensuring long-term stable operation in complex aerospace environments. Its good toughness makes it difficult for parts to fracture brittlely when subjected to impact loads, ensuring flight safety.
Some non-load-bearing structural parts of aircraft, such as ventilation ducts and decorative panels, often use 6063 aluminum alloy to give full play to its advantages such as good processing performance and corrosion resistance. While meeting functional requirements, it effectively reduces the weight of the aircraft.
In some small aircraft that are sensitive to weight, 6063 aluminum alloy square tubes are used to manufacture fuselage frames. Its light weight, high strength and corrosion resistance ensure the safe flight of aircraft in complex environments.
The 7000 series aluminum alloy uses zinc as the main additive element and is an ultra-high-strength aluminum alloy. Common alloy grades include 7075 and 7050. The 7075 alloy is one of the most widely used in the series. Its strength is very outstanding. After proper heat treatment, the yield strength can be as high as 500MPa or more, which enables it to withstand huge loads.
The 7075 alloy also has good toughness. While having high strength, it can effectively resist the expansion of cracks and reduce the risk of sudden breakage of parts during use. Its processing performance is also relatively excellent, and it can be made into the required shape and size through various processing processes.
However, the corrosion resistance of the 7075 alloy is relatively weak, especially in harsh environments such as marine climates, where stress corrosion cracking is prone to occur. In order to overcome this problem, surface treatments such as anodizing and coating with protective coatings are often used to improve its corrosion resistance.
In the field of aerospace, since 7000 series aluminum properties are really good, they are mainly used to manufacture the main load-bearing structural parts of aircraft, such as wing beams, fuselage frames, landing gear and other key parts. These parts need to withstand huge tensile, compression, bending and other loads during flight.
Original Source:https://www.aircraftaluminium.com/a/6000-and-7000-series-aluminum-in-aerospace-engineering.html
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