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Coarsening of polyhedral grains in a liquid matrix

Published online by Cambridge University Press:  31 January 2011

Yang-Il Jung ,
Suk-Joong L. Kang  and
Duk Yong Yoon
Suk-Joong L. Kang*
Affiliation:
Center for NanoInterface Technology, Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Republic of Korea
Duk Yong Yoon
Affiliation:
Center for NanoInterface Technology, Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Republic of Korea; and Korea Research Institute of Standards and Science, Daejeon 305-340, and Pohang University of Science and Technology, Pohang 790-784, Republic of Korea
*
a) Address all correspondence to this author. e-mail: sjkang@kaist.ac.kr
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Abstract

The coarsening of polyhedral grains in a liquid matrix was calculated using crystal growth and dissolution equations used in crystal growth theories for faceted crystals. The coarsening behavior was principally governed by the relative value of the maximum driving force for growth (Δgmax), which is determined by the average size and size distribution, to the critical driving force for appreciable growth (Δgc). When Δgmax was much larger than Δgc, pseudonormal grain coarsening occurred. With a reduction of Δgmax relative to Δgc, abnormal grain coarsening (AGC, when Δgmax ≥ Δgc) and stagnant grain coarsening (SGC, when Δgmax < Δgc) were predicted. The observed cyclic AGC and incubation for AGC in real systems with faceted grains were explained in terms of the relative value between Δgmax and Δgc. The effects of various processing and physical parameters, such as the initial grain size and distribution, the liquid volume fraction, step free energy, and temperature, were also evaluated. The calculated results were in good agreement with previous experimental observations.

Keywords

Crystal growthGrain boundariesPolycrystal
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 9 , September 2009 , pp. 2949 - 2959
Copyright
Copyright © Materials Research Society 2009

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