alloys vacuum degassed and gas enriched were cast into conical shell molds. The castings having different quantities of gas porosities show nearly the same total shrinkage volume which decreases at higher Si contents.Pure aluminum and Al-10%Si alloy permit an unchanged volume of external shrinkage and reduced volumes of internal shrinkage with an increase in porosity volume. Al-4%Si and Al-7%Si alloys permit unchanged volumes of internal and external shrinkages respectively at lower and higher porosity levels. The volumes of internal shrinkage at higher porosity levels and of external one at lower porosity levels decrease with an increase in porosity volume. The porosity changes from a concentrated type to dispersed one with an increase in porosity volume. The gas dissolved in the melt has remarkable effects on the shrinkage morphology.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.