Effect of Instability of TiC Particles on the Grain-Refining Behavior of Al-Ti-C Inoculants in Aluminum Alloys

  1. Dipl.-Ing. K. Ehrke Chairman2 and
  2. Prof. Dr. W. Schneider3
  1. M. Vandyoussefi and
  2. A. L. Greer

Published Online: 21 APR 2006

DOI: 10.1002/3527607331.ch38

Continuous Casting

Continuous Casting

How to Cite

Vandyoussefi, M. and Greer, A. L. (2000) Effect of Instability of TiC Particles on the Grain-Refining Behavior of Al-Ti-C Inoculants in Aluminum Alloys, in Continuous Casting (eds K. Ehrke and W. Schneider), Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim, FRG. doi: 10.1002/3527607331.ch38

Editor Information

  1. 2

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

  2. 3

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

Author Information

  1. University of Cambridge, Cambridge, UK

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;
  • instability TiC particles;
  • grain-refining behavior of Al-Ti-C inoculants in aluminum alloys

Summary

According to the Al-Ti-C phase diagram, TiC is only a stable phase in Al-melts rich in Ti and C, and should convert to Al4C3 at the normal addition levels of Al-Ti-C refiners to melts. The effects of melt composition on TiC stability and on grain-refiner performance are examined using TP-1 refining tests on super-purity Al and using thermodynamic modeling. Effective grain refinement with little fading of performance on holding the refiner in the melt is observed only for melt compositions within the liquid + TiC phase field. In contrast when Al4C3 is stable, the refining is poor even at short holding times, and fades considerably at longer holding times. This change in grain-refining behavior is related to the decomposition of TiC.