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Directional Solidification of Mg-Al Alloys and Microsegregation Study of Mg Alloys AZ31 and AM50: Part II. Comparison between AZ31 and AM50

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Abstract

Directional solidification (DS) of magnesium alloys AZ31 and AM50 was carried out to investigate microstructures and microsegregation under controlled solidification conditions. The methodology used is based on a customized DS technique elaborated on in Part I of this work. Dendritic microstructures observed in longitudinal sections of the quenched mushy zone, X-ray maps of fully directionally solidified cross sections, and quantitative solute profiles reveal the impact of cooling rate and alloy type. The solute-solvent correlation discloses the opposite segregation behavior of manganese compared to both aluminum and zinc and provides an impartial basis for the advanced weighted-interval ranking sort (WIRS) sorting scheme of electron probe microanalysis (EPMA) data. Precipitates Al8Mn5 and γ-Mg17Al12, predicted by thermodynamic calculations, are identified in the microstructure. The effect of back-diffusion during solidification, most pronounced for the component zinc, was clearly observed for both alloys in comparison with dedicated Scheil-total calculations.

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Acknowledgment

This study is supported by the German Research Foundation (DFG) in the Priority Programme “DFG-SPP 1168: InnoMagTec” under Grant No. Schm 588/27(29).

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Author notes

  1. Djordje Mirković (PhD Student, Project Engineer)

    Present address: Salzgitter Mannesmann Forschung GmbH, D-38239, Salzgitter, Germany

Authors and Affiliations

  1. Institute of Metallurgy, Clausthal University of Technology, D-38678, Clausthal-Zellerfeld, Germany

    Djordje Mirković (PhD Student, Project Engineer) & Rainer Schmid-Fetzer (Professor)

Authors
  1. Djordje Mirković
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  2. Rainer Schmid-Fetzer
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Correspondence to Rainer Schmid-Fetzer.

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Manuscript submitted July 14, 2008.

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Mirković, D., Schmid-Fetzer, R. Directional Solidification of Mg-Al Alloys and Microsegregation Study of Mg Alloys AZ31 and AM50: Part II. Comparison between AZ31 and AM50. Metall Mater Trans A 40, 974–981 (2009). https://doi.org/10.1007/s11661-009-9788-2

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  • DOI: https://doi.org/10.1007/s11661-009-9788-2

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