Influence of Additional Sr and TiB on Aluminium Al-Si-Cu-Mg Alloys for Produced Prototype Cylinder Head Motorcycle

Lost-foam casting is a cast method that uses expanded polystyrene foam (EPS) as a mold pattern embedded into silica sand. At this foundry the cooling rate of molten metal is slowly, affecting the size of silicon particles and mechanical properties. The aim of this work is to investigate the effect of addition modifier Sr and Grains refiner to hardness, toughness, tensile strength and microstructure of A319. The mold pattern EPS foam prototype cylinder head pinned in silica sand. The aluminum A319 was melted in a furnace and poured at a temperature of 700 oC. The experimental results showed additional Sr or TiB increase the tensile strength and toughness of the cast, but not significantly affect the hardness of the casting.