Abstract

The platelet β intermetallic compound has been considered as the most common and detrimental Fe intermetallic compounds in casting aluminum alloys with impurity Fe. This compound drastically deteriorates the mechanical properties of the alloys, especially ductility. It is required to modify the β compound to other less harmful Fe compounds. This study mainly focused on the influence of the Fe content, Mn/Fe ratio and cooling rate on the modification process of Fe compounds in the cast A356 alloy with different Fe contents from 1.0 wt.% to 2.5 wt.%. The results revealed that with increasing the Fe content in the alloy without Mn addition, the size of the platelet β compound increases significantly. The Mn addition was effective to modify the platelet β compound to more compact compounds, Chinese script and/or star-like even the polyhedral shape a compound, which mainly depends on the Mn/Fe ratio and the cooling rate in a given Fe level.

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