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A study of the microstructure, phase composition, and mechanical properties of extruded Mg–9Er–6Y–xZn–0.6Zr magnesium alloys

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Abstract

The microstructure, phase composition, and mechanical properties of Mg–9Er–6Y–xZn–0.6Zr (x = 1, 3, 5 wt%; nominal chemical composition) series alloys were investigated through optical microscopy, X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectrometry, transmission electron microscopy, and tensile tests. Numerous granular Mg24(Er, Y, Zn)5 phases were distributed in a discontinuous network mainly along the grain boundaries in the alloy with 1 wt% Zn. With increasing Zn content, the Mg24(Er, Y, Zn)5 phases in the alloys gradually disappeared, the amount of block Mg12Zn(Y, Er) phases increased, and the block size became larger. In addition, a few lamellar phases grew parallel with one another from the grain boundaries to the grain interior in the alloys. The crystallographic structures of the Mg12Zn(Y, Er) and Mg24(Er, Y, Zn)5 phases were confirmed as 18R-type long-period stacking ordered structures and body-centered cubic structures, respectively. The Mg12Zn(Y, Er) phases with long-period stacking ordered structures increased the strength and toughness of the alloys more than the Mg24(Er, Y, Zn)5 phases with body-centered cubic structures.

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Acknowledgements

The authors are grateful for the financial support from the Program for New Century Excellent Talents in University (Grant No. NCET-11-0554) and the National Key Technology R&D Program (Project No. 2011BAE22B04).

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Authors and Affiliations

  1. College of Materials Science and Engineering, Chongqing University, Chongqing, 400044, People’s Republic of China

    Jingfeng Wang, Pengfei Song, Xiaoen Zhou & Fusheng Pan

  2. National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing, 400044, People’s Republic of China

    Jingfeng Wang & Fusheng Pan

Authors
  1. Jingfeng Wang
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  2. Pengfei Song
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  3. Xiaoen Zhou
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  4. Fusheng Pan
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Correspondence to Jingfeng Wang.

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Wang, J., Song, P., Zhou, X. et al. A study of the microstructure, phase composition, and mechanical properties of extruded Mg–9Er–6Y–xZn–0.6Zr magnesium alloys. J Mater Sci 47, 6716–6723 (2012). https://doi.org/10.1007/s10853-012-6614-9

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  • DOI: https://doi.org/10.1007/s10853-012-6614-9

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