Abstract
In AlSi alloys, iron plays an important role, and as one of the main impurities, it causes the formation of β-Al5FeSi intermetallics. This study aims to understand the effect of fluid flow on the microstructure and intermetallics in Al–5/7/9 wt-%Si 0·2/0·5/1·0 wt-%Fe alloys directionally solidified in a special furnace facility Artemis-3 under defined thermal and fluid flow conditions (generated through rotating magnetic field). Results showed that forced flow can cause shortening of the β platelets in dendritic regions with increasing their number density. The studies have shown that application of stirring could lead to better results in shortening β-Al5FeSi than lowering Fe content in the range from 1·0 to 0·2 wt-%Fe. It is deduced that the melt flowing together with the β phases reaches the superheated bulk where intermetallics could be fragmented or remelted, and finally, microstructures with shorter β-Al5FeSi and higher number density of β might be obtained.
Published Version
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