Upward and downward unsteady-state directional solidification of a hypoeutectic Al-3wt.%Mg alloy

C. Brito , F. Bertelli , M.A.P. Castanho , P.R. Goulart , N. Cheung , J.E. Spinelli , A. Garcia
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Abstract

Solidification thermal parameters, such as growth rate, cooling rate and dendrite arm spacing (λ), have been measured in a hypoeutectic Al-Mg alloy directionally solidified under upward and downward transient heat flow conditions. The experimental setup used in this work consists of a water-cooled mould with heat being extracted from the bottom or the top, promoting upward and downward directional solidification, respectively. It is shown that the dendritic arm spacing are not significantly affected by interdendritic convection for both solidification configurations and single growth laws are proposed for both cases. The Bouchard- Kirkaldy model is shown to overestimate the experimental primary dendritic arm spacing, despite fitting properly the secondary dendrite arm spacing.

亚共晶Al-3wt的向上和向下非稳态定向凝固。%镁合金
测定了在上下两种瞬态热流条件下定向凝固的亚共晶Al-Mg合金的生长速率、冷却速率和枝晶臂间距(λ)等凝固热参数。本实验采用的实验装置由一个水冷模具组成,从底部或顶部抽出热量,分别促进向上和向下定向凝固。结果表明,在两种凝固形态下,枝晶间对流对枝晶臂间距的影响都不显著,两种凝固形态下枝晶臂间距的生长规律都是单一的。结果表明,Bouchard- Kirkaldy模型高估了实验初生枝晶臂间距,尽管它能很好地拟合次生枝晶臂间距。
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