Phase-field simulations of spiral growth during directional ternary eutectic solidification
Phase-field simulations of spiral growth during directional ternary eutectic solidification
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DOI：
10.1016/j.actamat.2015.12.052
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发表时间：
2016-03-01
期刊：
影响因子：
9.4
通讯作者：
Ruede, Ulrich
中科院分区：
文献类型：
--
作者：
Hoetzer, Johannes;Steinmetz, Philipp;Ruede, Ulrich
多元合金中三元共晶的定向凝固过程中，观察到了各种各样的生长模式。一种假设的模式是两个棒状相围绕彼此旋转的螺旋生长，这两个棒状相嵌入在基质相中。螺旋生长的可能证据被发现实验在纵向显微照片的三元共晶系统Ag-Al-Cu。相场法允许研究这种空间复杂的微观结构，以便更深入地了解三元共晶的三维图案形成。基于模拟参数，这产生了一个高的倾斜角，在2D片层生长，通过系统的参数研究确定，多个螺旋检测在大规模的3D模拟。通过相场模拟，证实了实验报道的三元共晶中存在螺旋生长的可能性。(C)2016 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
A wide variety of growth patterns has been observed during the directional solidification of three-phase ternary eutectics in multi-component alloys. One hypothesized pattern is the spiral growth of two rodlike phases rotating around each other, which are embedded in a matrix phase. Possible evidence of spiral growth is found experimentally in longitudinal micrographs of the ternary eutectic system Ag-Al-Cu. The phase-field method allows the study of such spatially complex microstructures in order to gain deeper insights into the three-dimensional pattern formation of ternary eutectics. Based on the simulation parameters, which produced a high tilt angle in 2D lamellar growth, determined via systematic parameter studies, multiple spirals are detected in large-scale 3D simulations. Through the presented phase-field simulations, the possibility of the existence of spiral growth in ternary eutectics, reported from experiments, is confirmed. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.