Modelling dendrite evolution under rapid solidification conditions

被引：8
|
作者：
Li, Q [1 ]
Li, D [1 ]
Qian, A [1 ]
机构：
[1] Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
来源：
INTERNATIONAL JOURNAL OF CAST METALS RESEARCH | 2004年 / 17卷 / 06期
关键词：
modelling; rapid solidification; microsegregation; dendrite morphology;
D O I：
10.1179/136404604225022720
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
The evolution of a single dendrite is simulated by the cellular automaton ( CA) method, in which the influences of interface velocity on the solute partition coefficient ahead of the interface and liquidus slope are investigated under rapid solidification conditions. Furthermore, the kinetic undercooling ahead of the interface is also taken into account, which is neglected under normal solidification conditions. The simulated dendrite morphology is compared with that of the equilibrium conditions and it is shown that the interface easily loses stability around the dendritic tip causing more and more secondary dendrite arms to appear. In addition, the solute partition coefficient increases when the interface velocity increases, which leads to a decrease in solute microsegregation.
引用
收藏
页码：339 / 344
页数：6
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