The Role of Iron in the Nucleation of Eutectic Silicon in Aluminum-Silicon Hypoeutectic Alloys

摘要

Commercial aluminum-silicon foundry alloys invariably contain significant amounts of iron. It is shown through thermodynamic and thermal analyses, as well as scanning and transmission electron microscopy coupled with selected area electron diffraction analysis and elemental x-ray mapping that iron in hypoeutectic aluminum-silicon alloys plays an important role in the nucleation of the eutectic silicon phase.