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Quantification of Primary Dendritic and Secondary Eutectic Nucleation Undercoolings in Rapidly Solidified Hypo-Eutectic Al-Cu Droplets

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Abstract

This paper reports on the quantification of primary dendritic and secondary eutectic nucleation undercoolings during rapid solidification of impulse atomized hypo-eutectic Al-Cu droplets. The procedure consists in determining the eutectic fraction of each investigated droplet from the fraction of intermetallic Al2Cu obtained by Rietveld refinement analysis of neutrons scattering data. The corresponding eutectic nucleation undercooling is then deduced from the metastable phase diagram of the alloy. The primary dendritic nucleation undercooling is subsequently determined using semi-empirical coarsening models of secondary dendrite arms. The two nucleation undercoolings are finally used as input variables to run a microsegregation model for binary alloys. The fractions of eutectic computed by the microsegregation model compare very favorably with the experimental results.

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Acknowledgments

The authors are grateful to the Natural Sciences and Engineering Research Council of Canada (NSERC), Novelis, the Canadian Space Agency (CSA), the European Space Agency (ESA) and the Agence Nationale de Recherche (ANR-France) under MIMOSA for their financial support. Drs. M.Rappaz and Jonas Valloton are also acknowledged for fruitful discussions.

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Authors and Affiliations

  1. Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB, T6G 2G6, Canada

    A.-A. Bogno (Postdoctoral Fellow), P. Delshad Khatibi (Graduate Student) & H. Henein (Professo)

  2. Centre de Mise en forme des matériaux, CNRS UMR 7635, CS10207, MINES ParisTech, 06904, Sophia Antipolis, France

    Ch.-A. Gandin (Professor)

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  1. A.-A. Bogno
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  2. P. Delshad Khatibi
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  3. H. Henein
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  4. Ch.-A. Gandin
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Correspondence to A.-A. Bogno.

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Manuscript submitted December 15, 2015.

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Bogno, AA., Khatibi, P.D., Henein, H. et al. Quantification of Primary Dendritic and Secondary Eutectic Nucleation Undercoolings in Rapidly Solidified Hypo-Eutectic Al-Cu Droplets. Metall Mater Trans A 47, 4606–4615 (2016). https://doi.org/10.1007/s11661-016-3594-4

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  • DOI: https://doi.org/10.1007/s11661-016-3594-4

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