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Abstract
This study was performed on an Al-6.2% Si-3.7% Cu-0.37% Fe-0.095% Mn (A319.2) alloy, to study the effect of trace elements on the β-Al5FeSi intermetallic phase characteristics observed in the alloy and the resultant tensile properties. The results show that increasing the iron content leads to precipitation of long, branched platelets of the β-Al5FeSi phase. These platelets (or needles as they appear in the microstructure) often result in the formation of large shrinkage cavities due to the inability of the liquid metal to fill the spaces between the branched platelets. The alloy tensile properties are greatly improved by: a) Sr addition in the range 200–400 ppm, b) increasing the Mn/Fe ratio to 0.7, c) addition of 0.08%Be, d) addition of 0.08% Be+ 0.02% Sr. The results indicate that the classic neutralization treatment of using a Mn addition with or without Cr could be replaced by the combined 0.08%Be + 0.02%Sr addition. The latter combination produces a much better improvement in the alloy ductility. The rupture mode changes from transgranular to intergranular as the iron concentration is increased from 0.5% to 1.5%. Fragmentation of the β-Al5FeSi platelets using Sr or Be + Sr, or their transformation into α-Al15(Fe, Mn, Cr)3Si2 in the form of Chinese script or sludge particles (using Mn or Mn + Cr) results in a ductile dimpled rupture surface.
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