Heat-treated Al-Si alloys are widely used in the automotive, military, marine, electrical, food and chemical industries. This alloy exhibits high-strength properties used in corrosion-resistant homes. However, this alloy has low mechanical properties and a large granular structure when cast. The properties of aluminium alloys depend primarily on the microstructure. It is very important to achieve a smooth structure. The formation of fine and equivalent grains depends primarily on the amount of hardening, the addition of basic alloys (grain cleaners), the mixing and processing of alloys. Aluminium alloys are an important component of light metals used in industry. Al-Si alloys are essential for automotive, aerospace, marine and engineering applications. Al-Si alloys have excellent physical and mechanical properties. These alloys offer low weight, excellent corrosion resistance, easy machining, heat treatment, excellent casting ability and excellent machining performance. The mechanical properties of these alloys depend primarily on the size, shape and distribution of Si and Al particles. Al-Si alloy produces coarse α-Al dendrites and shark eutectic silicon. Fine structures are known to provide good mechanical properties and reduce casting defects. During the casting process, a fine-grained structure can be obtained by adding a lower alloy to the melt.