Effect of convective flow on stable dendritic growth in rapid solidification of a binary alloy

被引：48

作者：

Galenko, P. K. ^{[1
]}

Danilov, D. A. ^{[2
]}

Reuther, K. ^{[1
]}

Alexandrov, D. V. ^{[3
]}

Rettenmayr, M. ^{[1
]}

Herlach, D. M. ^{[4
,5
]}

机构：

[1] Friedrich Schiller Univ Jean, Phys Astron Fak, D-07743 Jena, Germany

[2] KIT, Inst Nanotechnol INT, D-76344 Eggenstein Leopoldshafen, Germany

[3] Ural Fed Univ, Dept Math Sci, Ekaterinburg 620000, Russia

[4] Ruhr Univ Bochum, Phys Astron Fak, D-44801 Bochum, Germany

[5] Deutsch Zentrum Luft & Raumfahrt DLR, Inst Mat Phys Weltraum, D-51170 Cologne, Germany

来源：

JOURNAL OF CRYSTAL GROWTH | 2017年 / 457卷

基金：

俄罗斯科学基金会;

关键词：

Dendrites; Growth models; Morphological stability; Growth from melt; UNDERCOOLED MELTS; FORCED-CONVECTION; MODEL;

D O I：

10.1016/j.jcrysgro.2016.07.042

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

A model for anisotropic growth of a dendritic crystal in a binary mixture under non-isothermal conditions is presented. A criterion for a stable growth mode is given for the dendrite tip as a function of the thermal Peclet number and the ratio between the velocities of dendrite growth and solute diffusion in the liquid bulk. Limiting cases of known criteria for anisotropic dendrite growth at low and high growth Peclet numbers are provided. The inclusion of forced convective flow extends the range of theoretical predictions, especially to low growth velocities, thus eliminating systematic discrepancies between earlier models and observed experimental data, as shown by a comparison of model predictions with measured growth velocities in Ti-55 at% Al alloys solidified under electromagnetic levitation. (C) 2016 Elsevier B.V. All rights reserved.

引用

页码：349 / 355

页数：7

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