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Aluminium alloys (or aluminum alloys; see spelling differences) are alloys in which aluminium (Al) is the predominant metal. The typical alloying elements are copper, magnesium, manganese, silicon, tin and zinc. There are two principal classifications, namely casting alloys and wrought alloys, both of which are further subdivided into the categories heat-treatable and non-heat-treatable. About 85% of aluminium is used for wrought products, for example rolled plate, foils and extrusions. Cast aluminium alloys yield cost-effective products due to the low melting point, although they generally have lower tensile strengths than wrought alloys. The most important cast aluminium alloy system is Al–Si, where the high levels of silicon (4.0–13%) contribute to give good casting characteristics.
Aluminium alloys are widely used in engineering structures and components where light weight or corrosion resistance is required.
6000 series of aluminum alloy on behalf of 6061, mainly contains two elements of magnesium and silicon, so it can cover both advantage of 4000 series and 5000 series aluminum alloy, 6000 series aluminum alloy is from cold treatment with good properties on high oxidative requirements and corrosion environment, can be easily to process without lose of performance.