112. A New Zirconium-Rich Master Alloy for the Grain Refinement of Magnesium Alloys

  1. Prof. Dr. K. U. Kainer
  1. Ma Qian1,
  2. D. H. StJohn1 and
  3. M. T. Frost2

Published Online: 22 APR 2005

DOI: 10.1002/3527603565.ch112

Magnesium: Proceedings of the 6th International Conference Magnesium Alloys and Their Applications

Magnesium: Proceedings of the 6th International Conference Magnesium Alloys and Their Applications

How to Cite

Qian, M., StJohn, D. H. and Frost, M. T. (2005) A New Zirconium-Rich Master Alloy for the Grain Refinement of Magnesium Alloys, in Magnesium: Proceedings of the 6th International Conference Magnesium Alloys and Their Applications (ed K. U. Kainer), Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim, FRG. doi: 10.1002/3527603565.ch112

Editor Information

  1. GKSS-Forschungszentrum, Institut für Werkstoffforschung, Max-Planck-Straße, 21502 Geesthacht, Germany

Author Information

  1. 1

    Division of Materials Engineering, University of Queensland, Brisbane, Qld 4072, Australia

  2. 2

    Australian Magnesium Corporation Limited (AMC), PO Box 1364, Milton BC, Qld 4064, Australia

Publication History

  1. Published Online: 22 APR 2005
  2. Published Print: 27 NOV 2003

ISBN Information

Print ISBN: 9783527309757

Online ISBN: 9783527603565

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Keywords:

  • zirconium-rich master alloy;
  • grain refinement of magnesium alloys

Summary

A new zirconium-rich magnesium-zirconium master alloy (designated AM-cast) has been developed by the CRC for Cast Metals Manufacturing in collaboration with Australian Magnesium Corporation for use as a grain refiner for magnesium alloys that do not contain aluminium. This work describes the microstructural characteristics of this new grain refiner and its grain refining ability when added to different magnesium alloys under various conditions (alloying temperature from 680 °C to 750 °C; weight of melt from 1 kg to 150 kg and sample thickness from 7 mm to 62 mm). Owing to its highly alloyable microstructure, AM-cast can be readily introduced into molten magnesium at any temperature when assisted by a few minutes of stirring or puddling. Little sludge has been found at the bottom of the alloying vessel in these trials due to the fine zirconium particles contained in the master alloy. The recovery of zirconium is normally in the range from 40% to 60% with respect to 1% zirconium addition as the master alloy. It is shown that this new master alloy is an excellent grain refiner for aluminium-free magnesium alloys.