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Kinetic Analyses of the Growth and Dissolution Phenomena of Primary Si and α-Al in Partially Molten Al-Si (-Cu-Mg) Alloy Particles Using In Situ Transmission Electron Microscopy

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Abstract

The growth and dissolution behavior of primary Si and α-Al in partially molten hypereutectic Al-Si–based alloy particles was investigated using in situ TEM to reveal the dynamic and instantaneous processes occurring during these phenomena. Direct evidence for the preferential growth of Si {113} facets compared with {111} facets resulting in prominent {111} facets bounding the Si crystals was obtained. The nucleation of primary Si was found to occur heterogeneously on the encapsulating alumina shell, whereas the α-Al phase nucleated homogeneously from the liquid Al-Si phase. The morphology of primary Si during growth was found to be highly faceted during growth but smoothly curved during dissolution, revealing fundamental mechanistic differences during these processes. We provide a ledge-based interpretation to explain the difference in growth and dissolution behavior. The α-Al phase displayed smoothly curved growth and dissolution morphologies, which are characteristic of an isotropic interfacial energy and a continuous growth mechanism.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, University of Virginia, Charlottesville, VA, 22904, USA

    Santhana K. Eswara Moorthy (Graduate Research Assistant, Post Doctoral Researcher) & James M. Howe (Professor)

  2. Laboratoire de Physique des Solides, Centre National de la Recherche Scientifique (CNRS), Université Paris Sud, 91405, Orsay, France

    Santhana K. Eswara Moorthy (Graduate Research Assistant, Post Doctoral Researcher)

Authors
  1. Santhana K. Eswara Moorthy
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  2. James M. Howe
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Correspondence to Santhana K. Eswara Moorthy.

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Manuscript submitted March 1, 2010.

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Eswara Moorthy, S.K., Howe, J.M. Kinetic Analyses of the Growth and Dissolution Phenomena of Primary Si and α-Al in Partially Molten Al-Si (-Cu-Mg) Alloy Particles Using In Situ Transmission Electron Microscopy. Metall Mater Trans A 42, 1667–1674 (2011). https://doi.org/10.1007/s11661-010-0543-5

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