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Influence of rare-earth addition on the long-period stacking ordered phase in cast Mg–Y–Zn alloys

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Abstract

The microstructure and thermal stability of the Mg97Y2Zn1 (at.%) alloy, modified with the addition of 0.5 at.% of gadolinium or neodymium, have been examined by synchrotron radiation diffraction during in situ differential scanning calorimetry. The microstructure of the three alloys consists of magnesium dendrites with the Long Period Stacking Ordered (LPSO) phase at interdendritic regions. Rare-earth atoms substitute yttrium atoms in the LPSO phase, promoting the formation of the 14H structure. Lattice parameters of the LPSO do not change significantly with the rare-earth addition. However, they reduce the melting point of the LPSO phase, especially in the case of neodymium addition.

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Acknowledgements

The authors are grateful to MEC for financial support for this study under project MAT2009-07811. The DeutchesElektronen-Synchrotron DESY is acknowledged for the provision of beamtime at the P07 beamline of the Petra III synchrotron facility in the framework of proposal I-20120285 EC. The authors would like to thank Dr. A. Rhys Williams for proof-reading the manuscript.

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Authors and Affiliations

  1. Department of Physical Metallurgy, National Center for Metallurgical Research (CENIM-CSIC), Avda. Gregorio del Amo 8, 28040, Madrid, Spain

    Gerardo Garcés, Pablo Pérez & Paloma Adeva

  2. Institute of Materials Science and Technology, Vienna University of Technology, Karlsplatz 13/308, 1040, Vienna, Austria

    Guillermo Requena

  3. Institute of Materials Research, Helmholtz-ZentrumGeesthacht, Max-Planck-Str. 1, 21502, Geesthacht, Germany

    Domonkos Tolnai & Andreas Stark

  4. Structural Research on New Materials, Helmholtz-ZentrumGeesthacht Outstation at DESY, Hamburg, Germany

    Norbert Schell

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  1. Gerardo Garcés
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Correspondence to Gerardo Garcés.

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Garcés, G., Requena, G., Tolnai, D. et al. Influence of rare-earth addition on the long-period stacking ordered phase in cast Mg–Y–Zn alloys. J Mater Sci 49, 2714–2722 (2014). https://doi.org/10.1007/s10853-013-7967-4

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  • DOI: https://doi.org/10.1007/s10853-013-7967-4

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