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Coarsening of polyhedral grains in a liquid matrix

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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.

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Authors and Affiliations

  1. Center for NanoInterface Technology, Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon, 305-701, Republic of Korea

    Yang-Il Jung, Duk Yong Yoon & Suk-Joong L. Kang

  2. Korea Research Institute of Standards and Science, Daejeon, 305-340, China

    Duk Yong Yoon

  3. Pohang University of Science and Technology, Pohang, 790-784, Republic of Korea

    Duk Yong Yoon

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  1. Yang-Il Jung
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Correspondence to Suk-Joong L. Kang.

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This author was an editor of this journal during the review and decision stage. For the JMR policy on review and publication of manuscripts authored by editors, please refer to http://www.mrs.org/jmr_policy

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Jung, YI., Yoon, D.Y. & Kang, SJ.L. Coarsening of polyhedral grains in a liquid matrix. Journal of Materials Research 24, 2949–2959 (2009). https://doi.org/10.1557/jmr.2009.0356

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