Formation of the phase composition, structure, and properties of eutectic Al−Si alloys in pressure casting

Eutectic silumins are widely used industrial alloys. In traditional casting into sand or chill molds the regular features of the structure formation in silumins have been studied insufficiently thoroughly. In particular, the mechanism of the formation of numerous fine crystals of silicon that cause rapid wear of the cutting tools when the castings are processed is unclear, and the factors affecting the hardening of the alloys have not been studied in detail. The present paper is devoted to the results of a study of the phase composition, strength, and ductility of silumins hardened under conditions of intense cooling and pressure that are typical for pressure casting.