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Microstructure and Mechanical Properties of Mg–8Y–2Ho–2Zn Alloy with Long Period Stacking Ordered Phase

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Abstract

In this study, microstructures, phase compositions, phase morphologies of the as-cast and as-extruded Mg–8Y–2Ho–2Zn (wt%) alloys were investigated by optical microscope, scanning electron microscope, energy-dispersive spectrometer, transmission electron microscope and X-ray diffraction. The mechanical properties at room temperature and elevated temperatures were evaluated by tensile test. The primary secondary phases in the as-cast alloy are 18R-type long period stacking ordered (LPSO) phase. After extrusion, the microstructure mainly consists of considerable fine dynamically recrystallized (DRX) grains, the long strip 18R-type LPSO-phase at grain boundary along the extrusion direction and the fine lamellar 14H-type LPSO-phase in the interior of DRX grains. When the temperature is increased, the strength of the alloy is reduced, but the elongation progressively rises. The as-extruded alloy shows higher strength and larger elongation than the as-cast alloy at each test temperature. The superior mechanical properties of the as-extruded alloy are ascribed to various strengthening mechanisms induced by co-addition of Y and Ho element, e.g., solid solution strengthening, fine-grain strengthening and strengthening of fine LPSO-phase.

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Acknowledgements

This work is supported by Science and Technology Project of Education Department of Jilin Province and Science and Technology Development Project of Jilin Province (Grant No. 20190303061SF)

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Authors and Affiliations

  1. Key Laboratory of Automobile Materials (Ministry of Education), College of Materials Science and Engineering, Jilin University, Changchun, 130022, People’s Republic of China

    J. A. Liu, J. Wang, M. L. Yang & Y. M. Yao

  2. School of Mechanical and Aerospace Engineering, Jilin University, Changchun, 130022, People’s Republic of China

    Y. M. Yao

  3. State Key Laboratory of Superhard Materials, Jilin University, Changchun, 130022, People’s Republic of China

    Y. M. Yao

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  1. J. A. Liu
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  2. J. Wang
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Correspondence to Y. M. Yao.

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Liu, J.A., Wang, J., Yang, M.L. et al. Microstructure and Mechanical Properties of Mg–8Y–2Ho–2Zn Alloy with Long Period Stacking Ordered Phase. Met. Mater. Int. 27, 1613–1619 (2021). https://doi.org/10.1007/s12540-019-00587-7

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