What are the mainstream grade classifications of aviation aluminum alloy?

Three core series dominate aviation aluminum alloy applications. The 2xxx copper-containing series features good high-temperature strength and weldability for fuselage skin and engine auxiliary parts. The 7xxx zinc-magnesium-copper series delivers the highest tensile strength, applied on wing beams, landing gear forgings and heavy-load connecting components. The 6xxx magnesium-silicon aviation grades own excellent corrosion resistance and forming performance for auxiliary structural frames. Each series adopts exclusive smelting and aging heat treatment to match different flight load and environmental service requirements.