Abstract
In aluminium alloys, iron is a common impurity as it is unavoidably picked up in practice. The excessive Fe is strongly prone to form various intermetallic phases. These Fe-rich intermetallics are generally brittle and act as stress raisers to weaken the coherence with Al matrix, therefore decreasing elongation. However, Fe addition in Al-Mg alloys may be beneficial because of the improvement in the yield strength with the scarification of ductility of die-cast aluminium alloys. The morphology of intermetallic phases has a vital effect on the properties of aluminium alloys. In the present work, the 3D morphology of Al6 (Fe, Mn) in die-cast Al-Mg-Mn alloys with different levels of Fe contents were revealed. The formation of Al6 (Fe, Mn) was also studied through crystal features and solidification behaviours.
Highlights
In die-cast aluminium alloys, Fe is a common deleterious impurity for elongation and is not economically removed from the melt [1,2,3]
The morphology of intermetallic phases has a vital effect on the properties of aluminium alloys
The mechanical properties of alloys are closed with the morphology of intermetallic phases
Summary
In die-cast aluminium alloys, Fe is a common deleterious impurity for elongation and is not economically removed from the melt [1,2,3]. The application of recycled Al alloy with high Fe content is still an important concern in industry. The obstacle of the application of recycled high-Fe Al alloy is that Fe-rich intermetallics would decrease elongation obviously. The addition of Mn in Al-Mg alloys can modify Al3Fe to Al6(Fe, Mn), and the increased cooling rate can significantly refine the Al6(Fe, Mn) phase. It further increases the upper limit of the Fe level in aluminium alloys. The mechanical properties (especially the fracture behavior) of alloys are closed with the morphology of intermetallic phases. The present work aims to reveal the 3D morphology and relative growth mechanism of Al6(Fe, Mn) phase in Al-Mg-Mn-Fe alloys.
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