EFFECT OF FAR-FIELD FLOW ON THE GROWTH OF COLUMNAR CRYSTAL IN TERNARY UNDERCOOLED MELT

Hailong Fan (), Mingwen Chen () and Yanyan Shan ()
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Hailong Fan: School of Mathematics and Physics, University of Science and Technology Beijing, Beijing 100083, P. R. China
Mingwen Chen: School of Mathematics and Physics, University of Science and Technology Beijing, Beijing 100083, P. R. China
Yanyan Shan: #x2020;College of Science, Inner Mongolia University of Technology, Inner Mongolia, Hohhot 010051, P. R. China

Surface Review and Letters (SRL), 2020, vol. 27, issue 07, 1-11

Abstract: The asymptotic method has been used to investigate the columnar crystals growth subjected to far-field flow in ternary undercooled melt under non-isothermal conditions, and approximate analytical expression of radius and interface growth rate of columnar crystals growth have been given. It is found that the flow causes columnar crystal to grow faster in the upstream direction and slower in the downstream direction, and the growth of columnar crystals in flowing ternary melt is also affected by impurity content, that is, the higher the impurity content, the faster the columnar crystal grows in the upstream direction and the slower the growth in the downstream direction. The growth problem of columnar crystals from multi-component melt under flow is more complicated than that of a pure melt because it involves both the heat transport process and mass transport in the solute. The results show that the deflection angle of columnar crystals is a result of interaction of flow and impurity content.

Keywords: Columnar crystal; ternary alloy; far-field flow; crystal growth; interfacial morphology (search for similar items in EconPapers)
Date: 2020
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DOI: 10.1142/S0218625X19501701

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