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A constitutive law for the thermo-mechanical modelling of magnesium alloy extrusion

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Abstract

Metal extrusion as one of the production processes for semi-finished products plays an important role for the optimisation of wrought magnesium alloys. A mechanistic approach for the modelling of the coupled deformation and temperature fields is presented here. It accounts for the strain rate and temperature dependence of the mechanical properties as well as for the evolution of anisotropy and tension-compression asymmetry of magnesium alloys. In an attempt to calibrate the model parameter, tension and compression tests at different temperatures and strain rates are conducted for two different alloys, namely ZE10 and ZEK100. Extrusion trials are simulated and the predicted results are compared in terms of punch force and temperature history. Conclusions are formulated with respect to the significance of model parameters.

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Acknowledgements

The extrusion model presented here is part of the PhD thesis of S.E. The authors gratefully acknowledge the financial support for the project “Description of thermo-mechanical processes during extrusion of aluminium free magnesium alloys” by the German Research Association (DFG) under contract number BO 2461/1. They also thank Prof. Walter Reimers and Dr. Hans-Michael Mayer from the Technical University Berlin as well as Dr. Sören Müller from the Extrusion Research and Development Center of the same university for the tests executed within the project and presented above. The authors furthermore like to acknowledge the extensive discussion and the help of M. Nebebe during the realisation of the parameter calibration procedure.

The work was finalised during a sabbatical leave of D.S. at the Graduate Institute of Ferrous Technology (G.I.F.T.) of POSTECH, Pohang, South Korea as part of an international outgoing fellowship (Marie Curie Actions) of the 7th programme of the European Commission. The authors deeply acknowledge this support and hereby point out that the EU is not responsible for the content of this paper.

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Authors and Affiliations

  1. Helmholtz-Zentrum Geesthacht Centre for Materials and Coastal Research, Materials Mechanics, Geesthacht, Germany

    Serkan Ertürk & Dirk Steglich

  2. Helmholtz-Zentrum Geesthacht Centre for Materials and Coastal Research, Magnesium Innovations Center MagIC, Geesthacht, Germany

    Serkan Ertürk, Jan Bohlen & Dietmar Letzig

  3. Technical Faculty of Christian-Albrecht-University, Kiel, Germany

    Wolfgang Brocks

  4. G.I.F.T., Pohang University of Science and Technology, Pohang, South Korea

    Dirk Steglich

Authors
  1. Serkan Ertürk
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  2. Wolfgang Brocks
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  3. Jan Bohlen
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  4. Dietmar Letzig
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  5. Dirk Steglich
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Correspondence to Dirk Steglich.

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Ertürk, S., Brocks, W., Bohlen, J. et al. A constitutive law for the thermo-mechanical modelling of magnesium alloy extrusion. Int J Mater Form 5, 325–339 (2012). https://doi.org/10.1007/s12289-011-1055-6

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  • DOI: https://doi.org/10.1007/s12289-011-1055-6

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