113. A Manufacturing Technology of AZ91-Alloy Slurry for Semi Solid Forming

  1. Prof. Dr. K. U. Kainer
  1. Ji-Young Byun,
  2. Soon Il Kwon,
  3. Heon Phil Ha and
  4. Jin-Kook Yoon

Published Online: 22 APR 2005

DOI: 10.1002/3527603565.ch113

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

Byun, J.-Y., Kwon, S. I., Ha, H. P. and Yoon, J.-K. (2003) A Manufacturing Technology of AZ91-Alloy Slurry for Semi Solid Forming, 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.ch113

Editor Information

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

Author Information

  1. Div. of Materials, Korea Inst. of Sci. and Tech., #39-1 Haweolgok-Dong, Sungbuk-Ku, Seoul 136-791, Republic of Korea

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:

  • manufacturing technology;
  • AZ91-alloy slurry;
  • semi solid forming

Summary

This paper describes a method for the manufacturing of AZ91-alloy slurries for semi solid forming. The basic principle of the method is to use Al8(Mn,Fe)5 precipitates as the heterogeneous nucleation sites for primary Mg phases. The Al8(Mn,Fe)5 phase is precipitated in the AZ91 alloy melt due to supersaturated Mn. If these precipitates act heterogeneous nucleation sites, the primary Mg will be formed on the precipitates when the melt is held at the solid/liquid two-phase region. Microscopic analysis for the location of the Al8(Mn,Fe)5 precipitate explains that the Al8(Mn,Fe)5 precipitate is the effective heterogeneous nucleation site for the primary Mg phase. It was also observed that increase of Mn content in the melt resulted in smaller and more globular primary Mg due to increase of number of heterogeneous nucleation sites. The cooling rate below to the solid/liquid two-phase region, the holding time at that region, and the Mn content in AZ91 alloy affect on the quality of slurry.