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Abnormal growth of faceted (WC) grains in a (Co) liquid matrix

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Abstract

If the grains dispersed in a liquid matrix are spherical, their surface atomic structure is expected to be rough (diffuse), and their coarsening has been observed to be controlled by diffusion in the matrix. They do not, furthermore, undergo abnormal growth. On the other hand, in some compound material systems, the grains in liquid matrices are faceted and often show abnormal coarsening behavior. Their faceted surface planes are expected to be singular (atomically flat) and therefore grow by a defect-assisted process and two-dimensional (2-D) nucleation. Contrary to the usual coarsening the-ories, their growth velocity is not linearly dependent on the driving force arising from the grain size difference. If the growth of the faceted grains occurs by 2-D nucleation, the rate is expected to increase abruptly at a critical supersaturation, as has been observed in crystal growth in melts and solutions. It is proposed that this growth mechanism leads to the abnormal grain coarsening. The 2-D nucleation theory predicts that there is a threshold initial grain size for the abnormal grain growth (AGG), and the propensity for AGG will increase with the heat-treatment temperature. The AGG behavior will also vary with the defects in the grains. These predictions are qualitatively confirmed in the sintered WC-Co alloy prepared from fine (0.85-Μm) and coarse (5.48-Μm) WC powders and their mixtures. The observed dependence of the AGG behavior on the sintering temperature and the milling of the WC powder is also qualitatively consistent with the predicted behavior.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, 305-701, Taejeon, Korea

    Young Joon Park (Postdoctoral Candidate) & Nong Moon Hwang (Professor)

  2. Korea Research Institute of Standards and Science, 305-600, Taejeon, Korea

    Duk Yong Yoon (Principal Investigator)

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  1. Young Joon Park
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  2. Nong Moon Hwang
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Park, Y.J., Hwang, N.M. & Yoon, D.Y. Abnormal growth of faceted (WC) grains in a (Co) liquid matrix. Metall Mater Trans A 27, 2809–2819 (1996). https://doi.org/10.1007/BF02652373

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