Decoupled versus coupled growth dynamics of an irregular eutectic alloy

被引：6
|
作者：
Mohagheghi, Samira [1 ]
Bottin-Rousseau, Sabine [2 ]
Akamatsu, Silvere [2 ]
Serefoglu, Melis [1 ]
机构：
[1] Koc Univ, Dept Mech Engn, Rumeli Feneri Yolu, TR-34450 Istanbul, Turkey
[2] Sorbonne Univ, Inst NanoSci Paris, CNRS, UMR 7588, 4 Pl Jussieu, F-75252 Paris 05, France
来源：
SCRIPTA MATERIALIA | 2020年 / 189卷
关键词：
Irregular eutectic growth; Directional solidification; Eutectic solidification; Interface dynamics; Solidification microstructures; SOLIDIFICATION; SILICON; LAMELLAR;
D O I：
10.1016/j.scriptamat.2020.07.053
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
We present an experimental study of irregular growth patterns observed in real time during thinsample directional solidification of a faceted/nonfaceted eutectic alloy, namely, the transparent 2-amino-2-methyl-1,3-propanediol (AMPD)-succinonitrile (SCN) system. The body-centered cubic SCN crystals are nonfaceted, while monoclinic AMPD crystals grow as faceted needles. At low velocities (<0.3 mu ms(-1)), a decoupled growth regime is observed, during which the tip of the AMPD crystals grows ahead of the SCN-liquid interface. At intermediate velocities, an unsteady coupled-growth regime takes place, with intermittent pinning of triple SCN-AMPD-liquid junctions, and frequent noncrystallographic branching. At higher velocities (>1 mu ms(-1)), two-phase fingers form. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：11 / 15
页数：5
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