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Effect of Heat Treatment on Microstructures and Mechanical Properties of Mg–5.5Gd–3.5Nd–0.5Zn–0.4Zr Alloy

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Abstract

In this study, we developed a new kind of high-strength Mg–5.5Gd–3.5Nd–0.5Zn–0.4Zr (wt%) alloy. Microstructures and mechanical properties of this new kind of alloy under different heat treatment conditions have been investigated. The as-cast alloy was composed of α-Mg matrix, discontinuous α-Mg + Mg5Gd eutectic phases, needle-like Mg12Nd phases, spherical α(Zr) particles, and cuboid-shaped (Gd, Nd)H2 phases within α-Mg grains. Rod-like Zn2Zr3 phases were formed and unevenly distributed inside the α-Mg matrix after solution treatment. Thin-plate β′ phases precipitated after aging at 205 °C for 24 h. The T6-treated alloy exhibited excellent tensile properties up to 250 °C. The dislocation cross-slip was activated when tensile temperature increased to 300 °C, which resulted in the largely decreased strength and increased elongation.

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Acknowledgements

This work was supported by the National Key R&D Program of China (Grant No. 2018YFB2002000).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Northeastern University, Shenyang, 110819, China

    Zhengqiu Li, Deming Zhang & Zhihao Zhao

  2. BGRIMM Technology Group, Beijing, 100160, China

    Zhengqiu Li, Deming Zhang, Chunyang Xia, Yijun Zhu & Ziqi Liu

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  1. Zhengqiu Li
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  2. Deming Zhang
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  3. Zhihao Zhao
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  4. Chunyang Xia
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Correspondence to Deming Zhang.

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Li, Z., Zhang, D., Zhao, Z. et al. Effect of Heat Treatment on Microstructures and Mechanical Properties of Mg–5.5Gd–3.5Nd–0.5Zn–0.4Zr Alloy. Trans Indian Inst Met 75, 2883–2890 (2022). https://doi.org/10.1007/s12666-022-02646-x

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