Stability of lamellar eutectic growth
Stability of lamellar eutectic growth
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DOI：
10.1016/j.actamat.2007.11.037
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发表时间：
2008-04
期刊：
影响因子：
9.4
通讯作者：
A. Parisi;M. Plapp
中科院分区：
文献类型：
--
作者：
A. Parisi;M. Plapp
采用三维相场定量模拟方法，研究了具有对称相图的一般共晶合金和透明有机合金四溴化碳-六氯乙烷的层状共晶耦合生长的形态稳定性。确定了限制大间距稳定稳定增长的不稳定性，并将其与薄样品中已知的不稳定性进行了比较。对于所研究的所有合金和成分，首先发生的不稳定性是Z字形不稳定性，它可以饱和或导致片层破裂成棒状或迷宫结构，这取决于初始间距和体积分数。模拟结果与最近的实验观测结果吻合较好。
The morphological stability of lamellar eutectic coupled growth is investigated by means of quantitative three-dimensional phase-field simulations, both for a generic eutectic alloy with a symmetric phase diagram and for the transparent organic alloy carbontetrabromide–hexachloroethane. The instabilities that limit stable steady-state growth at large spacings are identified and compared to the instabilities known in thin samples. For all alloys and compositions investigated, the first instability to occur is a zigzag instability, which can saturate or lead to the breakup of the lamellae into rods or labyrinth structures, depending on the initial spacing and the volume fractions. The simulation results are in good agreement with recent experimental observations.