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Aluminum alloy is a general term of aluminum-based alloy. Aluminum alloy has low density but high strength which is close to or higher than the quality steel, it has good plasticity and easy processing, and can be processed into various profiles. Due to its excellent electric conductivity, thermal conductivity and corrosion resistance, after adding different alloying elements, it can produce casting aluminum alloy with good casting property or wrought aluminum alloy with good processing plasticity.