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Investigation of Macrosegregation Formation in Aluminium DC Casting for Different Alloy Systems

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Abstract

Direct chill (DC) casting of aluminum involves alloys employing different solute elements. In this article, a qualitative analysis and comparison of macrosegregation formation is presented for three different alloy systems: Al-Mg, Al-Zn and Al-Cu. For this purpose, a multiphase, multiscale solidification model based on a volume-averaging method accounting for shrinkage-induced flow, thermal-solutal convection and grain motion is used and applied to an industrial-scale DC-cast ingot. The primary difference between these alloys is the thermal-solutal convection with Al-Mg having a competing thermal and solutal convection, whereas the other two systems have a cooperating thermal and solutal convection. In the study, the combined effect of the macrosegregation mechanisms is analyzed for each alloy to assess the role of the alloy system on the final macrosegregation.

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Acknowledgment

This work is conducted within the framework of the PRIMAL project with support from Hydro, Alcoa, Aleris, the Research Council of Norway and NOTUR High Performance Computing program.

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Authors and Affiliations

  1. Department of Materials Technology, NTNU, 7491, Trondheim, Norway

    Akash Pakanati & Mohammed M’Hamdi

  2. SINTEF Materials and Chemistry, 0314, Oslo, Norway

    Mohammed M’Hamdi

  3. Institut Jean Lamour, CNRS – Université de Lorraine, Campus Artem, 2 allée André Guinier, 54000, Nancy, France

    Hervé Combeau & Miha Založnik

  4. Laboratory of Excellence on Design of Alloy Metals for low-mAss Structures (‘DAMAS’), Université de Lorraine, Lorraine, France

    Hervé Combeau & Miha Založnik

Authors
  1. Akash Pakanati
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  2. Mohammed M’Hamdi
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  3. Hervé Combeau
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  4. Miha Založnik
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Corresponding author

Correspondence to Akash Pakanati.

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Manuscript submitted December 21, 2017.

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Pakanati, A., M’Hamdi, M., Combeau, H. et al. Investigation of Macrosegregation Formation in Aluminium DC Casting for Different Alloy Systems. Metall Mater Trans A 49, 4710–4721 (2018). https://doi.org/10.1007/s11661-018-4731-z

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  • DOI: https://doi.org/10.1007/s11661-018-4731-z

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