Influence of Modifiers-Ligatures on the Properties of Cast Aluminum Alloy AK5M2 for the Automotive Industry

The paper analyzes the effectiveness of modifying aluminum alloys with active additives of microcrystalline alloys of different types. Production technologies have been developed, and the optimum amount of the most effective modifiers and active reinforcing additives for silumin made from recyclable materials has been determined; the connection of changes of structure with the parameters of mechanical properties of secondary silumin was established. It was found that the optimum amount of modifier-ligature Al-Ti5 was 0,1% by weight of liquid metal. Using more modifiers is not rational from the standpoint of materials science, economics, and ecology. The addition of such additive provided in the cast and heat-treated material an increase in the hardness by (20–30)% and tensile strength by (15–25)% due to the change in shape and dispersion of the formed intermetallic phases, reduction of porosity and increase in density. The use of non-deficient, cheap and environmentally friendly active additives in combination with traditional refining-modifying treatment can provide a significant increase in the properties of cast aluminum alloy products and are recommended for use in industry.