Abstract
The solidification behavior of a complex Al-11.3Si-2Cu-0.4Fe alloy with separate additions of 0.85% bismuth (Bi), 0.42% antimony (Sb), and 0.04% strontium (Sr) and cooled at rates between 0.5 and 2°C/s was examined by using a combination of computer-aided cooling curve thermal analysis (CA-CCTA) and interrupted quenching tests. Results show that the sequence of phase formations is in the following order: dendritic Al, pre-eutectic Al15(Fe,Mn)3(Si,Cu)2 and β-Al5FeSi intermetallics, eutectic Al-Si, and post-eutectic Al2Cu. Bi, Sb, and Sr additions had a significant effect on the onset of Al-Si and Al2Cu phases, with Sr having the strongest effect by decreasing the nucleation temperature of Al-Si. On the other hand, Bi addition increased the solidification range. Nucleation temperature of primary Al and Al2Cu phase increased as cooling rate increased. The coherency temperature decreased, and the fraction solid at the coherency point increased with increasing cooling rate. A relationship between solidification temperature range and fraction solid for each phase evolutions was observed.
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