Many alloys reveal an upwardly directed solutal buoyancy in the interdendritic mushy region as they solidify. Such a situation leads to a solute enrichment at the top of the melt pool and is prone to form segregation channels. Based on both experimental observations and numerical simulations applying an aque-ous ammonium chloride solution subject to side cooling, this contribution dis-cusses the complex interplay of different phenomena that leads to a sedimen-tation bed that is far from being homogenous. Concentration and flow stratifica-tion at the top part of the test cell, interdendritic flow channels transporting both segregated liquid and also crystal fragments into the bulk melt, crystal agglom-erations that form at indentations observed at the exit of flow channels, and collapsing of crystal agglomerations and sliding down of mushy zone seg-ments, all these phenomena lead to a highly unsteady solidification dynamic. These observations are relevant in fields such as metallurgy, materials science, geology, and environmental science and could enhance the design of industri-al processes and contribute to natural system modeling.
Author (s) Details
Golshan Shayesteh
Metallurgy Department, Montanuniversitaet Leoben, 8700 Leoben, Austria.
Zhao Zhang
Primetals Technologies Limited, 4031 Linz, Austria.
Mihaela Stefan-Kharicha
Metallurgy Department, Montanuniversitaet Leoben, 8700 Leoben, Austria.
Menghuai Wu
Metallurgy Department, Montanuniversitaet Leoben, 8700 Leoben, Austria.
Abdellah Kharicha
Metallurgy Department, Montanuniversitaet Leoben, 8700 Leoben, Austria and CD
Laboratory for Magnetohydrodynamic Application in Metallurgy,
Montanuniversitaet Leoben, 8700 Leoben, Austria.
Andreas Ludwig
Metallurgy Department, Montanuniversitaet Leoben, 8700 Leoben, Austria.
Please see the book here:- https://doi.org/10.9734/bpi/mono/978-93-49473-95-9/CH1
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