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The effects of different Fe and Si additions on the microstructure and mechanical properties of as-cast Al–5Cu alloys were studied. The results show that the evolution order of the Fe-rich intermetallic morphology is needle-like  β -Fe then Chinese-script Fe-rich intermetallic, and the area size of Chinese-script Fe-rich intermetallic increased from 66 to 1058 μm 2  with the increase of Fe addition. It was found that the combined additions of Fe and Si can change the morphology and size of Fe-rich intermetallic, and thus improving mechanical properties. However, the excessive Si addition would cause Si particles to precipitate, and the morphology of Fe-rich intermetallic had a tendency to needled-like. The alloy's solidification path of second phases is  α -Fe + AlmFe→ β -Fe→binary eutectic (Al 2 Cu + Si) in Al–5Cu– X Si– X Fe alloys.

Effects of Si and Fe additions on mechanical properties of as-cast Al–5Cu alloys