Abstract
The study analyzes the impact of modifying a secondary aluminum casting alloy of the Al-Si system with high-dispersion silicon carbide on the density of the metal and the macrostructure of cylindrical castings. It was found that the solidification rate and the structure of the metal depend on the type of mold (metal or sand-clay) and the amount of added SiC. Alloys with a 0.1% SiC addition, cast in a metal mold, have the highest density. The macrostructure of SiC-modified castings is characterized by the presence of deep shrinkage cavities and concentrated porosity. Castings poured into a sand-clay mold with SiC modification show concentrated shrinkage and gas pores, which corresponds to a low grade on the reference scale. The study highlights the importance of choosing the casting method and alloy modification to optimize the density and structure of the castings.
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