MASTER COMPOSITION AND PROCESS FOR THE EUTECTIC COMPONENT OF EUTECTIC AND HYPOEUTECTIC ALUMINIUMSILICON CASTING ALLOYS

摘要

1510915 Treating aluminium silicon alloys KAWECKI BERYLCO INDUSTRIES Inc 11 June 1976 24241/76 Heading C7D A master composition of strontium silicide with optionally aluminium powder, mixtures of Al and Mg powders or powdered Al-Mg alloys is used to modify the eutectic or hyfo-eutectic aluminium silicon alloys. The composition may be in the form of briquettes, containing 3-55, optionally 10-30% Sr with 40-75% Si, and the aluminous material contains 10-90% Al. Not more than 1% Ca may be present. Modification is carried out by adding the master alloy to the molten Al-Si alloy to introduce 0À005-0À4% Sr into the alloy.