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Orientation dependence of primary dendrite spacing

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Abstract

The orientation dependence of the primary dendrite spacing is examined through the solidification of a succinonitrile-3.61 wt pct acetone alloy with a Bridgman-type device. Primary dendrite spacing has been studied as a function of the primary dendrite trunk orientation with respect to the thermal gradient direction under different growth rate conditions. The observations show that the orientation dependence of the primary dendrite spacing can be related to the formation of new primary dendrites at divergent grain boundariesvia the branching mechanism. A branching-based model is developed to study the interaction between secondary and tertiary dendrite arms. Based on this model, a simple analytical relationship is proposed to account for the orientation dependence of the primary dendrite spacing.

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Authors and Affiliations

  1. Laboratoire de Métallurgie Physique, Ecole Polytechnique Fédérale de Lausanne, CH-1015, Lausanne, Switzerland

    CH. A. Gandin (Postdoctoral Fellow)

  2. Ames Laboratory, United States Department of Energy, Department of Materials Science and Engineering, Iowa State University, 50011, Ames, IA

    M. Eshelman (Postdoctoral Fellow) & R. Trivedi (Professor)

Authors
  1. CH. A. Gandin
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  2. M. Eshelman
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  3. R. Trivedi
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Gandin, C.A., Eshelman, M. & Trivedi, R. Orientation dependence of primary dendrite spacing. Metall Mater Trans A 27, 2727–2739 (1996). https://doi.org/10.1007/BF02652367

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  • DOI: https://doi.org/10.1007/BF02652367

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