Effect of Solute Elements on the Grain Structures of Al-Ti-B and Al-Ti-C Grain-Refined Al Alloys

  1. Dipl.-Ing. K. Ehrke Chairman3 and
  2. Prof. Dr. W. Schneider4
  1. A. Tronche1 and
  2. A. L. Greer2

Published Online: 21 APR 2006

DOI: 10.1002/3527607331.ch32

Continuous Casting

Continuous Casting

How to Cite

Tronche, A. and Greer, A. L. (2000) Effect of Solute Elements on the Grain Structures of Al-Ti-B and Al-Ti-C Grain-Refined Al Alloys, in Continuous Casting (eds K. Ehrke and W. Schneider), Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim, FRG. doi: 10.1002/3527607331.ch32

Editor Information

  1. 3

    ALUMINIUM Essen GmbH, Sulterkamp 71, D-45356 Essen, Germany

  2. 4

    VAW Aluminium AG, Forschung und Entwicklung, Georg-von-Boeselager-Str. 25, D-53117 Bonn, Germany

Author Information

  1. 1

    University of Cambridge, Cambridge, UK

  2. 2

    Péchiney Centre de Recherches de Voreppe, Voreppe, France

Publication History

  1. Published Online: 21 APR 2006
  2. Published Print: 29 NOV 2000

ISBN Information

Print ISBN: 9783527302833

Online ISBN: 9783527607334

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Keywords:

  • continuous casting;
  • grain structures of Al-Ti-B and Al-Ti-C grain-refined Al alloys;
  • influence of solute elements

Summary

The influence of solute elements on the structure of inoculated Al alloys, and the best parameter to represent solute effects, are assessed in this work. Experimental grain sizes were measured on Al-Ti-C grain-refined samples under TP-1 conditions [1], and results obtained in other studies [2] of Al-Ti-B refiners were analyzed also. The evolution of the structure with the solute content is found to be independent of the nature of the nucleation centers. The parameter Q=m(k−1)C0 [3,4] is found to represent better the effect of the solutes than the parameter P=Q/k also used in this type of study [2]. Nevertheless, when the solute alters the nucleation process, like Zr in the case of Al-Ti-B refiners [5], the growth-restriction parameter does not allow to predict the structure of the final product. It was shown in the case of Al-Ti-C refiners that, for example, the nucleation centers, i.e. the TiC particles [6], are poisoned by Si. The measured data were compared to results computed using the “free-growth” model [7].