Compositional convection in the solidification of binary alloys
Compositional convection in the solidification of binary alloys
复制标题
二元合金凝固中的复合对流
DOI：
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发表时间：
1994
影响因子：
3.7
通讯作者：
A. Fowler
中科院分区：
文献类型：
--
作者：
P. Emms;A. Fowler
二元合金定向凝固时，常形成两相糊状枝晶区。熔体的枝晶间对流可能发生，并且与残余熔体的成分对流耦合。如果流体流动速度足够高，则可能发生枝晶的局部回熔，导致通道形成，从而形成优选的流动路径。为了预测对流的发生，提出了一个耦合的液体/糊状物模型，其中包括大多数已知的物理。一个精心制作的缩放过程导致某些结论的对流的性质，并指向一个非常简化的模型，它基本上可以解析求解。理论预测与实验定量比较。
When a binary alloy is directionally solidified, a two-phase mushy dendritic zone is often formed. Interdendritic convection of the melt may occur, and is coupled with compositional convection of the residual melt. If fluid flow velocities are high enough, local melt-back of the dendrites may occur, leading to channel formation, and thus preferred flow paths. In order to predict the onset of convection, a coupled liquid/mush model is proposed, which includes most of the known physics. An elaborate scaling procedure leads to certain conclusions concerning the nature of convection, and points to a much simplified model, which can essentially be solved analytically. Predictions of the theory are compared quantitatively with experiments.