Castable zinc-aluminum alloys

摘要

An improved castable hypereutectic zinc-aluminum alloy which is free from underside shrinkage is described. Small additions, from about 0.25% and up to about 2 wt% of rare earth metal, preferably in the form of misch metal, to known zinc-aluminum alloys containing from about 20% and up to about 40 wt% aluminum have been found to prevent underside shrinkage in castings with a cross section up to about six inches.