Interactions between iron, manganese, and the Al-Si eutectic in hypoeutectic Al-Si alloys |
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| Authors: | C M Dinnis J A Taylor A K Dahle |
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| Affiliation: | (1) Present address: CRC for Cast Metals Manufacturing (CAST), Materials Engineering, School of Engineering, University of Queensland, Australia;(2) Orrcon Operations Pty Ltd., 4014 Brisbane, Australia;(3) CAST, Division of Materials, School of Engineering, The University of Queensland, 4072 St. Lucia, Australia |
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| Abstract: | Sand-cast plates were used to determine the effect of iron and manganese concentrations on porosity levels in Al-9 pct Si-0.5
pct Mg alloys. Iron increased porosity levels. Manganese additions increased porosity levels in alloys with 0.1 pct Fe, but
reduced porosity in alloys with 0.6 and 1 pct Fe. Thermal analysis and quenching were undertaken to determine the effect of
iron and managanese on the solidification of the Al-Si eutectic. At high iron levels, the presence of large β-Al5FeSi was found to reduce the number of eutectic nucleation events and increase the eutectic grain size. The preferential formation
of α-Al15Mn3Si2 upon addition of manganese reversed these effects. It is proposed that this interaction is due to β-Al5FeSi and the Al-Si eutectic having common nuclei. Porosity levels are proposed to be controlled by the eutectic grain size
and the size of the iron-bearing intermetallic particles rather than the specific intermetallic phase that forms. |
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