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Ostwald ripening in a system with a high volume fraction of coarsening phase

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Abstract

Experiments on the coarsening behavior of two-phase mixtures in a model Pb-Sn system are reported. This system fulfills most of the assumptions of theory and has the particular advantage that all the materials parameters necessary for a comparison between the experimentally measured and theoretically predicted coarsening kinetics are known. We have examined the coarsening of Sn-rich and Pb-rich solid phases in contact with eutectic liquid in the volume fraction solid range above approximately 0.6 where the development of a solid skeletal structure inhibits sedimentation. Particle intercept distributions are measured and found to be time independent when scaled by the average intercept. This invariance is interpreted as evidence that scale factor coarsening is present. The intercept distributions are in good agreement with the predictions of theory. Measurements of average intercept diameter as a function of time establish unambiguously that the coarsening follows the theoretically predictedt 1/3 kinetics. The coarsening rate constants are measured as a function of volume fraction solid and are found to exceed the values calculated from theory using the known thermophysical properties of the Pb-Sn system by factors ranging from approximately 2 to 5.

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Authors and Affiliations

  1. Metallurgy Division, National Bureau of Standards, 20899, Gaithersburg, MD

    S. C. Hardy

  2. Department of Materials Science and Engineering, Northwestern University, 60208, Evanston, IL

    P. W. Voorhees

Authors
  1. S. C. Hardy
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  2. P. W. Voorhees
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Formerly with the National Bureau of Standards

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Hardy, S.C., Voorhees, P.W. Ostwald ripening in a system with a high volume fraction of coarsening phase. Metall Trans A 19, 2713–2721 (1988). https://doi.org/10.1007/BF02645806

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  • DOI: https://doi.org/10.1007/BF02645806

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