Abstract
An experimental study has been conducted to assess the influence of permanent magnet stirring (PMS) at various rotation speeds (ω = 40, 80, 120, and 160 rpm) on the solidification microstructure of a novel Al-8Si-0.4Mg-0.2Sc-0.2Er alloy. The results reveal that the Sc and Er would produce small size Al(Sc,Er)2Si2 precipitates in the front of the Si phase under the increased rotation speed of PMS. Furthermore, it has been observed that PMS generates forced fluid flow with the magnetic Taylor number as large as 9.80 × 108, which significantly reduces the size of Al(Sc,Er)2Si2 and eutectic Si phase, promotes the formation of equiaxed dendrite α-Al grains.
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