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The crystallization and growth of AlB2 single crystal flakes in aluminum

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Abstract

An in situ high temperature heat treatment was used to investigate the crystallization and growth behavior of AlB2 flakes in aluminum. Aluminum samples containing 1.8% boron were heated above the liquidus and then rapidly cooled through the Al(L) + AlB12 region to avoid the formation of AlB12 crystals. Subsequently, a homogeneous distribution of high aspect ratio AlB2 flakes crystallized upon holding below the peritectic transition temperature. Growth rate in the (a) and (c) dimensions increased during elevated hold temperatures below the peritectic transition temperature. Surprisingly, faster cooling rates from above the liquidus to room temperature resulted in thinner, wider flakes. Similar to graphite this phenomenon is believed to result from a need to accommodate a changing misfit strain energy between the solidifying aluminum and the growing AlB2 flakes.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, University of Illinois, 61801, Urbana, Illinois, USA

    C. Deppisch, G. Liu, A. Hall, J. K. Shang & J. Economy

  2. Materials Research Laboratory, University of Illinois, 61801, Urbana, Illinois, USA

    Y. Xu

  3. Department of Materials Science and Engineering, and Materials Research Laboratory, University of Illinois, 61801, Urbana, Illinois, USA

    A. Zangvil

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  1. C. Deppisch
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  2. G. Liu
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  6. J. K. Shang
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  7. J. Economy
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Deppisch, C., Liu, G., Hall, A. et al. The crystallization and growth of AlB2 single crystal flakes in aluminum. Journal of Materials Research 13, 3485–3498 (1998). https://doi.org/10.1557/JMR.1998.0476

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  • DOI: https://doi.org/10.1557/JMR.1998.0476

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