NONLINEAR LOCAL DYNAMICS OF THE MELT CRYSTAL INTERFACE OF A BINARY ALLOY IN DIRECTIONAL SOLIDIFICATION

被引：11
作者：
TSIVERIOTIS, K
BROWN, RA
机构：
[1] Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge
来源：
PHYSICAL REVIEW B | 1993年 / 48卷 / 18期
关键词：
D O I：
10.1103/PhysRevB.48.13495
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Numerical simulations of large-amplitude cellular dynamics during thin-film, directional solidification of a succinonitrile-acetone alloy demonstrate strongly nonlinear local dynamics that involve oscillations of the deep grooves between the cells. The oscillations begin as breathing modes of the grooves and become more complex, showing period doubling, when the simultaneous dynamics of more than one groove is considered. These oscillations are not predicted by amplitude equations derived for cells near the planar interface. Simulations of the onset of cellular solidification demonstrate the importance of this mechanism to explain the scattered finite-amplitude cells that are observed in experiments near the onset of cellular solidification.
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页码：13495 / 13501
页数：7
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