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Microstructure and dislocation density evolutions in MgAlZn alloy processed by severe plastic deformation

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Abstract

Commercial MgAlZn alloy AZ31 was processed by hot extrusion and equal channel angular pressing (ECAP) known as EX-ECAP. Microstructure and defect structure evolution with strain due to ECAP were investigated by TEM, positron annihilation spectroscopy (PAS), and X-ray diffraction. Significant grain refinement was obtained by EX-ECAP. In the extruded condition relatively low density of dislocations was determined by PAS. Sharp increase of dislocation density occurred during the first two passes of ECAP, followed by the saturation and even a decline manifesting the dynamic recovery at higher strains. XRD line profile analysis confirmed the results of PAS with slightly higher values of dislocation densities in individual conditions. Detailed analysis of contrast factors allows to determine the type of dislocations and to draw conclusions about slip activation and its variations with strain. The influence of microstructure evolution on mechanical properties is discussed.

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Acknowledgements

This study was financially supported by GACR under the grants 106/09/0482 and P108/10/0648. Partial support by Charles University Research Center “Physics of Condensed Matter and Functional Materials" is also acknowledged. One of the authors J.G. acknowledges financial support by the Hungarian Scientific Research Fund, OTKA, Grant No. K-81360 and by the European Union and the European Social Fund under grant agreement no. TÁMOP 4.2.1./B-09/1/KMR-2010-0003 and J.V. acknowledges financial support by GAUK 59409/2009 and SVV-265303.

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Authors and Affiliations

  1. Department of Physics of Materials, Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic

    Miloš Janeček & Jitka Vrátná

  2. Department of Low Temperature Physics, Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic

    Jakub Čížek

  3. Department of Materials Physics, Eötvös Loránd University, Budapest, Hungary

    Jenő Gubicza

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  1. Miloš Janeček
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  2. Jakub Čížek
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  3. Jenő Gubicza
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  4. Jitka Vrátná
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Correspondence to Miloš Janeček.

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Janeček, M., Čížek, J., Gubicza, J. et al. Microstructure and dislocation density evolutions in MgAlZn alloy processed by severe plastic deformation. J Mater Sci 47, 7860–7869 (2012). https://doi.org/10.1007/s10853-012-6538-4

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  • DOI: https://doi.org/10.1007/s10853-012-6538-4

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