On the Constitution of Alloys of Copper, Aluminium and Silicon

Abstract

After a brief summary of recent work on the binary alloys of copper-aluminium, aluminium-silicon, and copper-silicon, the constitution and structure of the whole ternary system, copper-aluminium-silicon are considered. The constituents present, are those of the each binary system. There exist eleven surfaces of the primary separation, and eight invariant points on the liquidus surface. Seven invariant reactions and six ternary polymorphic changes take place in the solid state. The limit of solubility of silicon and aluminium in solid copper has been also determined.