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Microstructural evolution and superplastic behavior in friction stir processed Mg–Li–Al–Zn alloy

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Abstract

A Mg–Li–Al–Zn alloy was friction stir processed (FSP) under water, and the microstructures and superplastic behavior in the FSP alloy were investigated. The FSP Mg–Li–Al–Zn alloy consisted of a mixed microstructure with fine, equiaxed, and recrystallized α (hcp) and β (bcc) grains surrounded by high-angle grain boundaries, and the average grain size of the α and β grains was ~1.6 and ~6.8 μm, respectively. The fine α grains played a critical role in providing thermal stability for the β grains. The FSP Mg–Li–Al–Zn alloy exhibited low-temperature superplasticity with a ductility of 330 % at 100 °C and high strain rate superplasticity with ductility of ≥400 % at 225–300 °C. Microstructural examination and superplastic data analysis revealed that the dominant deformation mechanism for the FSPed Mg–Li–Al–Zn alloy is grain boundary sliding, which is controlled by the grain boundary diffusion in the β phase.

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Acknowledgements

This work was supported by the A-Star SERC (Singapore) under Grant No. 092 137 0018, and the National Natural Science Foundation of China under Grant No. 50871111.

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Authors and Affiliations

  1. School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore, 639798, Singapore

    F. C. Liu & M. J. Tan

  2. Kurimoto Ltd, 2-8-45 Suminoe, Osaka, 559-0021, Japan

    J. Liao

  3. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang, 110016, China

    Z. Y. Ma

  4. Beijing Aeronautical Manufacturing Technology Research Institute, Beijing, 100024, China

    Q. Meng

  5. JWRI, Osaka University, 11-1 Mihigaoka Ibaraki, Osaka, 567-0047, Japan

    F. C. Liu & K. Nakata

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  1. F. C. Liu
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  2. M. J. Tan
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  3. J. Liao
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  4. Z. Y. Ma
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Correspondence to F. C. Liu or M. J. Tan.

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Liu, F.C., Tan, M.J., Liao, J. et al. Microstructural evolution and superplastic behavior in friction stir processed Mg–Li–Al–Zn alloy. J Mater Sci 48, 8539–8546 (2013). https://doi.org/10.1007/s10853-013-7672-3

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  • DOI: https://doi.org/10.1007/s10853-013-7672-3

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