Aluminum, a metal, is often seen in our daily life. The strength of pure aluminum is very low, only about 9 kg / mm2. Therefore, pure aluminum can not be used to manufacture structural parts bearing load, and alloy must be synthesized.

Aluminum alloy is smelted by adding some alloy elements to aluminum, such as copper, magnesium, manganese, silicon, zinc and so on. It can be divided into fractal aluminum alloy and cast aluminum alloy. Aluminum alloys have high mechanical strength, low melting point and high plasticity, and good corrosion resistance (but lower than pure aluminum). Most aluminum alloys can further improve their mechanical properties through special heat treatment. For parts requiring low weight and high strength, it is ideal to make them with aluminum alloy. At present, it has been widely used in automobiles, tractors, agricultural machinery and some light industrial products, especially in the aviation industry.