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Modeling of solidification microstructures in concentrated solutions and intermetallic systems

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Abstract

Most of the theoretical models for the predictions of solidification microstructure and solute segregation are based on the assumption mat the solute distribution coefficient,k, is independent of temperature. For concentrated alloys and for alloys near intermetallic compounds,k may vary significantly with temperature. A theoretical analysis which shows the necessary modifications in the theoretical models which must be made ifk varies with temperature is developed. It is shown that for phase diagrams with linear liquidus and solidus segments, many of the results derived with constantk can be used if the solute distribution coefficientk is replaced by a modified parameterk* which includesk as well as the derivative ofk with composition. The application of the model to concentrated alloys and to compositions near intermetallic phases is discussed. It is shown that the variation ink with temperature can significantly alter the composition dependence of dendritic microstructural scales and change the solute segregation profiles in solidified alloys.

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Authors and Affiliations

  1. Ames Laboratory, United States Department of Energy, Iowa State University, 50011, Ames, IA

    R. Trivedi (Senior Scientist and Professor of Materials Science and Engineering)

  2. Swiss Federal Institute of Technology, CH-1007, Lausanne, Switzerland

    W. Kurz (Professor of Materials Engineering)

Authors
  1. R. Trivedi
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  2. W. Kurz
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Trivedi, R., Kurz, W. Modeling of solidification microstructures in concentrated solutions and intermetallic systems. Metall Trans A 21, 1311–1318 (1990). https://doi.org/10.1007/BF02656547

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  • DOI: https://doi.org/10.1007/BF02656547

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