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Obtaining Ultra-High Strength and Ductility in a Mg–Gd–Er–Zn–Zr Alloy via Extrusion, Pre-deformation and Two-Stage Aging

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

The Mg–12Gd–1Er–1Zn–0.9Zr (wt%) alloy with ultra-high strength and ductility was developed via hot extrusion combined with pre-deformation and two-stage aging treatment. The age-hardening behavior and microstructure evolution were investigated. Pre-deformation introduced a large number of dislocations, resulting in strain hardening and higher precipitation strengthening in the subsequent two-stage aging. As a result, the alloy showed a superior strength–ductility balance with a yield strength of 506 MPa, an ultimate tensile strength of 549 MPa and an elongation of 8.2% at room temperature. The finer and denser β′ precipitates significantly enhanced the strength, and the bimodal structure, small β-Mg5RE phase as well as dense γ′ precipitates ensured the good ductility of the alloy. It is suggested that the combination of pre-deformation and two-stage aging treatment is an effective method to further improve the mechanical properties of wrought Mg alloys.

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Fig. 1
Fig. 2
Fig. 3

taken from the precipitates inside DRXed grains along [0001]α-Mg

Fig. 4

taken from the precipitates inside worked grains along \({11 \, \overline{2}}\,0\)]α-Mg, c mapping of Gd, Er and Zn elements in the boxed region in b

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Acknowledgements

This work was supported by the National Key Research and Development Program of China (Nos. 2016YFB0301101 and 2016YFB0301000), the Key Science and Technology Program of Beijing Municipal Commission of Education (No. KZ201810005005), the National Natural Science Fund of China (No. 51801004) and the Beijing Natural Science Foundation (No. 2192006).

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Authors and Affiliations

  1. College of Materials Science and Engineering, Beijing University of Technology, Beijing, 100124, China

    Lin-Yue Jia, Wen-Bo Du, Jin-Long Fu, Zhao-Hui Wang, Ke Liu, Shu-Bo Li & Xian Du

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  1. Lin-Yue Jia
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Jia, LY., Du, WB., Fu, JL. et al. Obtaining Ultra-High Strength and Ductility in a Mg–Gd–Er–Zn–Zr Alloy via Extrusion, Pre-deformation and Two-Stage Aging. Acta Metall. Sin. (Engl. Lett.) 34, 39–44 (2021). https://doi.org/10.1007/s40195-020-01132-x

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