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Mechanical Properties of the Mg-Gd-Y-Zn-Zr Alloys with Different Morphologies of Long-Period Stacking Ordered Phases

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Abstract

Long-period stacking ordered (LPSO) phases with different morphologies and distributions were obtained in the direct chill cast Mg-6.9Gd-3.2Y-1.5Zn-0.5Zr (wt.%) alloy by controlling the homogenization time or cooling rate. Microstructural evolution and the effect of various LPSO phases on the mechanical properties were investigated. There is no obvious α-Mg grain growth during homogenization at 510 °C. Intragranular thin-platelet and coagulated LPSO phases hardly improve the strength but help to develop the ductility. Numerous lamellar phases, which contain “ABCA”-type building blocks with RE and Zn segregation, form during the furnace-cooling process. Lamellar phases, which exhibit lower thermostability compared with the thin-platelet LPSO, slightly improve the tensile yield strength and induce numerous cracks which result in the premature fracture.

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Acknowledgments

This work was supported by the National Basic Research Program of China [Grant Number 2013CB632200] and the Natural Science Foundation of China [Grant Number 51574291]. The authors would like to thank Professor Daoyun Ding for her comments on this paper.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Central South University, Changsha, 410083, China

    Xiaojie Zhou, Chuming Liu, Yonghao Gao & Zhiyong Chen

  2. Hunan Provincial Key Laboratory of Intelligent Manufacturing Technology for High-performance Mechanical Equipment, Changsha University of Science and Technology, Changsha, 410114, China

    Xiaojie Zhou

  3. School of Civil Engineering, Central South University, Changsha, 410083, China

    Shunong Jiang

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  1. Xiaojie Zhou
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  2. Chuming Liu
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Correspondence to Yonghao Gao.

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Zhou, X., Liu, C., Gao, Y. et al. Mechanical Properties of the Mg-Gd-Y-Zn-Zr Alloys with Different Morphologies of Long-Period Stacking Ordered Phases. J. of Materi Eng and Perform 27, 6237–6245 (2018). https://doi.org/10.1007/s11665-018-3713-z

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  • DOI: https://doi.org/10.1007/s11665-018-3713-z

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