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Analysis of the Deformation Behavior of Magnesium-Rare Earth Alloys Mg-2 pct Mn-1 pct Rare Earth and Mg-5 pct Y-4 pct Rare Earth by In Situ Energy-Dispersive X-ray Synchrotron Diffraction and Elasto-Plastic Self-Consistent Modeling

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Abstract

The deformation behavior of the Mg-RE alloys ME21 and WE54 was investigated. Although both alloys contain rare earth elements, which alter and weaken the texture, the flow curves of the alloys deviate significantly, especially in uniaxial compression test. Apart from the higher strength of the WE54 alloy, the compression flow curve does not exhibit the typical sigmoidal shape, which is associated with tension twinning. However, optical microscopy, X-ray texture measurements, and EBSD analysis reveal the activity of tension twinning. The combination of in situ energy-dispersive X-ray synchrotron diffraction and EPSC modeling was used to analyze these differences. The investigation reveals that twin propagation is decelerated in the WE54 alloy, which requires a change of the twinning scheme from the ‘finite initial fraction’ to the ‘continuity’ assumption. Furthermore, an enhanced activity of the 〈c+a〉 pyramidal slip system was observed in case of the WE54 alloy.

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Acknowledgments

The authors M. Lentz and W. Reimers are grateful for the financial support of the Deutsche Forschungsgemeinschaft (DFG) under the Contract Number RE 688/67-1. B. Clausen acknowledges support from US Department of Energy Office of Basic Energy Science through Project FWP 06SCPE401. The authors would like to thank Dr. T. Link (TU Berlin, Metallische Werkstoffe) for his support of the TEM analysis. The authors thank Dipl.-Ing. Iryna Driehorst and Dipl.-Ing. Jörg Nissen (TU Berlin, ZELMI) for the realization of the SEM and EBSD analysis. The authors would like to thank Dr. C. N. Tomé (Los Alamos National Laboratory, MST-8, NM, USA) for providing the EPSC 4 code and for helpful discussions.

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Author notes

  1. Rodrigo S. Coelho (Associate Professor, Head)

    Present address: Departamento de Materiais, SENAI - CIMATEC, Av. Orlando Gomes 1845, Piatã, Salvador, BA, 41650-010, Brazil

Authors and Affiliations

  1. Metallische Werkstoffe, Technische Universität Berlin, Ernst-Reuter-Platz 1, 10587, Berlin, Germany

    Martin Lentz (Research Associate), Florian Schmack (Student) & Walter Reimers (Chair)

  2. Microstructure and Residual Stress Analysis, Helmholtz Zentrum Berlin für Materialien und Energien, Albert-Einstein-Straße 15, 12489, Berlin, Germany

    Manuela Klaus (Scientist) & Rodrigo S. Coelho (Associate Professor, Head)

  3. LANSCE-LC, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA

    Bjørn Clausen (Scientist)

  4. Nanoarchitectures for Energy Conversion, Helmholtz-Zentrum Berlin für Materialien und Energien, Hahn-Meitner-Platz 1, 14109, Berlin, Germany

    Nobert Schaefer (Scientist)

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  1. Martin Lentz
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Correspondence to Martin Lentz.

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Manuscript submitted June 11, 2013.

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Lentz, M., Klaus, M., Coelho, R.S. et al. Analysis of the Deformation Behavior of Magnesium-Rare Earth Alloys Mg-2 pct Mn-1 pct Rare Earth and Mg-5 pct Y-4 pct Rare Earth by In Situ Energy-Dispersive X-ray Synchrotron Diffraction and Elasto-Plastic Self-Consistent Modeling. Metall Mater Trans A 45, 5721–5735 (2014). https://doi.org/10.1007/s11661-014-2533-5

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  • DOI: https://doi.org/10.1007/s11661-014-2533-5

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