Effect of rotating magnetic field and manganese on the formation of iron-containing intermetallic compounds in Al-Si alloy
Résumé
The acicular β-AlSiFe phase is common but detrimental iron-containing intermetallic phase in Al-Si alloys. In this study, rotating magnetic field (RMF) and manganese neutralizer were used to modify the β-phase in Al-12%Si-2%Fe alloy. The results showed that the manganese addition caused the morphological transformation of iron phase from β-AlFeSi to α-AlSiFeMn with the relation of transition rate to the manganese content. The total transformation was only achieved when Mn/Fe ratio is 1.1. The application of RMF facilitated the formation of α-AlSiFeMn phase even at lower Mn/Fe ratio, economizing manganese consumption and preventing the increase in total number of intermetallic compounds. The modification and facilitation mechanisms of RMF were based on the forced convection induced by electromagnetic force.
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