Experimental and numerical study of pattern formation in faceted cellular array growth |
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Authors: | Dongkai Shangguan John D Hunt |
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Affiliation: | (1) Electronics Division, Ford Motor Company, 48121-6010 Dearborn, MI;(2) Physical Metallurgy, is with the Department of Materials, University of Oxford, OX1 3PH Oxford, UK |
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Abstract: | In this article, a review of our recent experimental and numerical study of pattern formation in faceted cellular array growth
was presented.In situ observations in transparent faceting organic compounds have revealed the dynamical features of faceted cellular growth. Cell
tip splitting and loss of cells in the array have been found to be the main mechanisms for cell spacing adjustment. The time
evolution of a faceted cellular array has been followed numerically. It was found that pattern formation was history-dependent
and was determined by interactions in the array. These interactions were either transient or persistent, depending on the
growth condition. As a result, afinite range of stable cell spacings was found under a given growth condition; that is, there was no sharp selection. The cellular
structures were irregular when persistent interactions occurred, whereas relatively regular structures could be formed once
the transient interactions had stopped. The implication of these observations for pattern formation in other array growth
processes, such as nonfaceted cellular, dendritic, or eutectic growth, will be discussed.
This paper is based on a presentation made in the symposium “Growth and Configurations of Faceted Solid-Liquid Interfaces”
presented during the TMS annual meeting, New Orleans, Louisiana, February 17–21, 1991, under the auspices of the TMS Solidification
Committee.
Formerly Assistant Research Engineer, The University of Alabama. |
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