According to the processing method, aluminum alloys can be divided into two categories: deformed aluminum alloys and cast aluminum alloys: deformed aluminum alloys can withstand pressure processing. It can be processed into aluminum alloys of various shapes and specifications. Mainly used in the manufacture of aviation equipment, doors and windows for construction, etc. Deformed aluminum alloys are further divided into non-heat-treatable-strengthened aluminum alloys and heat-treatable-strengthened aluminum alloys. The non-heat-treatable strengthening type cannot improve mechanical properties through heat treatment, but can only be strengthened through cold working deformation. It mainly includes high-purity aluminum, industrial high-purity aluminum, industrial pure aluminum, and rust-proof aluminum. Heat-treatable-strengthened aluminum alloys can improve their mechanical properties by means of heat treatment such as quenching and aging. They can be divided into hard aluminum, forged aluminum, super-hard aluminum, and special aluminum alloys. Casting aluminum alloys can be divided into aluminum-silicon alloys, aluminum-copper alloys, aluminum-magnesium alloys, aluminum-zinc alloys and aluminum-rare-earth alloys according to their chemical composition. Crystal silicon aluminum alloy and cast aluminum alloy are used in the as-cast state.