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Hot working behavior of AZ31 and ME21 magnesium alloys

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Abstract

The plastic deformation and recrystallization behavior of the commercial magnesium alloys AZ31 and ME21 were analyzed in a wide temperature range. Using the conventional hyperbolic sine equation the flow stress dependence on temperature and strain rate was modeled. The activation energy for plastic deformation significantly increased with increasing temperature and delivered values above 180 kJmol−1 for both alloys in the very high-temperature regime (400–550 °C). At lower temperatures (250–400 °C) the activation energy of the AZ31 alloy was approximately 108 kJmol−1 considering the peak stress as well as 120 kJmol−1 considering the flow stress at a strain of 0.5. The stress exponent varied in a range between 4.5 and 6.5. During the high-temperature compression tests a partial recrystallized microstructure was formed, which was distinctly different in AZ31 compared to ME21 due to the different onset of dynamic recrystallization (DRX) mechanisms.

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Acknowledgments

The authors are grateful for the financial support from the Deutsche Forschungsgemeinschaft (DFG) under the contract number MU 2963/6-1. The assistance of Dirk Gräning (Metallic Materials, TU Berlin) during the compression tests and metallographic preparations is gratefully acknowledged.

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Authors and Affiliations

  1. Extrusion Research and Development Center, Chair Metallic Materials, TU Berlin, Gustav-Meyer-Allee 25, Sekr. TIB 4/1-2, 13355, Berlin, Germany

    S. Gall & S. Müller

  2. Chair Metallic Materials, TU Berlin, Ernst-Reuter-Platz 1, Sekr. BH 18, 10587, Berlin, Germany

    S. Gall, M. Huppmann, H. M. Mayer & W. Reimers

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  1. S. Gall
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  2. M. Huppmann
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  3. H. M. Mayer
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Correspondence to S. Gall.

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Gall, S., Huppmann, M., Mayer, H.M. et al. Hot working behavior of AZ31 and ME21 magnesium alloys. J Mater Sci 48, 473–480 (2013). https://doi.org/10.1007/s10853-012-6761-z

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  • DOI: https://doi.org/10.1007/s10853-012-6761-z

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