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Effect of Aging Treatment on the Precipitation Behavior and Mechanical Properties of Mg-9Gd-3Y-1.5Zn-0.5Zr Alloy

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Abstract

Aging heat treatments of an extruded Mg-9Gd-3Y-1.5Zn-0.5Zr (wt.%) alloy at 200, 225, and 250 °C for various times were studied. The results show that dynamic recrystallization (DRX) occurred during the extrusion process and the alloy exhibited a significant aging hardening response at temperatures ranging from 200 to 225 °C. The precipitation sequence of the alloy at 225 °C was supersaturated solid solution (SSSS) → β″ (D019, Mg3RE) → β′ (bco, Mg15RE3), where the β′ phase was the primary precipitated phase. A large amount of discontinuous lamellar-shaped 14H-structure long period stacking ordered (LPSO) phase was also observed in the α-Mg matrix before and after aging treatments. Owing to the combined strengthening effect of fine DRXed grains, β′ nanoparticles, and widespread LPSO phases, the ultimate tensile strength and tensile yield strength of the peak-aged extruded alloy reached 409 and 303 MPa, respectively. The elongation in this circumstance was ~7.1%, which was slightly lower than that of the alloy before aging treatment.

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Acknowledgments

This work is supported by the Program for New Century Excellent Talents in University (NCET-12-0849) and the Fundamental Research Funds for the Central Universities (2014ZZD03) and Youth Science Fund Project of National Natural Science Fund of China (51401070).

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Authors and Affiliations

  1. School of Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing, 102206, People’s Republic of China

    Zhiyong Xue, Yuejuan Ren, Ruipeng Zheng & Chao Xu

  2. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, People’s Republic of China

    Wenbo Luo

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  1. Zhiyong Xue
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  2. Yuejuan Ren
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Correspondence to Zhiyong Xue.

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Xue, Z., Ren, Y., Luo, W. et al. Effect of Aging Treatment on the Precipitation Behavior and Mechanical Properties of Mg-9Gd-3Y-1.5Zn-0.5Zr Alloy. J. of Materi Eng and Perform 26, 5963–5972 (2017). https://doi.org/10.1007/s11665-017-2755-y

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  • DOI: https://doi.org/10.1007/s11665-017-2755-y

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