Evolution Behaviors of Typical Fe-rich Phases of Al Alloy in Mg Melts
Al-2Fe-2Mn,Al-12Si-2Fe-2Mn,and ADC12 alloys were introduced into Mg melts,followed with melt holding and cooling,and Fe-rich perticipate layers were obtained at the bottom of ingots.Morphologies and strucutre characteristics of Fe-rich phases in Mg melt were investigated by scanning electron microscopy and X-ray diffraction.The results reveal that the structure of Fe-rich phases is transformed,presenting core-shell morphologies.Al6(Mn,Fe)phase in Al-2Fe-2Mn alloy is evolved to Al(Fe,Mn)and Al5(Fe,Mn)2 in the Mg melt,whereas α-Al15(Fe,Mn)3Si2 phase in Al-12Si-2Fe-2Mn alloy and β-Al5Si(Fe,Mn)in ADC12 alloy are both converted to Al5(Fe,Mn)2 and(Fe,Mn)3Al0.7Si0.3 phases.Compared to the primary Al alloys,Al content is singificantly reduced in Fe-rich phases of evolved alloys,indicating the dissolution of Al into Mg melt,which can be gathered and reused.
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