A356 series alloy is a typical Al-Si-Mg series ternary Aluminium alloy. A356 series casting alloy has excellent comprehensive properties. Its casting mold can be very good. It is often used to cast some thin-walled and complex-shaped castings. Meanwhile, due to that the alloy is handled by heating method, the alloy has high strength, excellent plasticity and impact toughness. Therefore, A356 alloy was widely used in the automotive industry in the late 1980s. Currently, cast aluminum alloy wheels are still dominated by A356 alloys at the worldwide market. With the development of the level, the design requirements of the automotive industry are constantly increasing, so that more and more of these alloys are applied to the casting of automotive industry parts, which has led to increasing requirements for the raw material of A356 aluminum alloy. Process characteristics, raw materials have a crucial effect on the quality of castings, which means that while pursuing high-quality aluminum alloy wheels, the quality of aluminum alloy raw materials must be strictly controlled.
Like other grades of
aluminum alloys, A356 alloys easily form inclusions in the molten state. Inclusions include solid inclusions such as carbides, nitrides, oxides, cyanides and metal inclusions such as iron, silicon, and manganese. Alumina mainly contains more than 95% of the content of inclusions, which causes metallurgical defects and pores in the casting, thereby reducing the strength, fatigue resistance, plasticity and corrosion resistance of the material. Therefore, through continuous improvement and improvement of the aluminum alloy melt purification process and corresponding equipment, the inclusions in the aluminum melt are continuously reduced. Through effective research and reasonable detection of inclusions, the process is fully evaluated. In order to determine the shape, composition and content of inclusions in the aluminum solution, through research on its shape, composition, etc., to achieve a comprehensive optimization of various purification process parameters
