Abstract
This study used recycled AlSi10MgFe alloy with an Fe content of 1.1% as the raw material and added Al-10Mn master alloy in the Mn/Fe ratio of 1:1. The microstructure of the recycled AlSi10MgFe alloy was characterized and analyzed using compositional analysis, optical microscopy, and scanning electron microscopy. The effects of Mn addition and changes in melt holding temperature on the sedimentation of Fe-rich phases in the recycled AlSi10MgFe alloy were investigated. The results showed that after the addition of Mn, the Fe-rich phases in the alloy transformed from needle-like beta-Al5FeSi phases to alpha-Al15(Fe, Mn)3Si2 phases, which tended to settle during melt holding. When the holding temperature was 660 degrees C, the iron removal rate of the recycled AlSi10MgFe alloy was optimal, with the upper part achieving a removal rate of 35.45% and the middle part achieving 26.36%. However, when the holding temperature exceeded 700 degrees C, the nucleation sites for alpha-Al15(Fe, Mn)3Si2 phases could not form in the melt, preventing effective Fe sedimentation, which significantly reduced the iron removal efficiency. At a holding temperature of 740 degrees C, the iron removal rate in the middle part was only 1.82%.