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Fabrication of High-Strength Mg–Gd–Nd–Zn–Sn–Zr Alloy via Extrusion and Aging

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Abstract

A high-strength Mg–9Gd–3Nd–1Zn–1Sn–0.5Zr (wt%) alloy bar was successfully fabricated by extrusion and following aging two-steps processes, during which the alloy′s microstructures were determined to investigate the refinement mechanism during extrusion and to reveal the morphology precipitation behavior of the as-extruded alloy after aging. Based on the characterization of the mechanical properties, the strengthening mechanism of the alloy under different treatment processes had been discussed. Our results showed that the greater the extent of extrusion, the finer the grains and eutectic phase, and crushing and dynamic recrystallization are the refinement mechanisms of the alloy in narrow-zone. After peak-aged treatment at 200 °C, a large number of spherical β′ phase and lamellar precipitated phase had been observed, which replaces the amorphous β" phase of the alloy was under-aged. The ultimate tensile strength, yield strength, and elongation were 462.12 MPa, 391.97 MPa, and 4.2% respectively, and the increase number of the β′ phase and long-period stacking ordered (LPSO) phase were the reason why the strength of the alloy reached the highest value. At the over-aging stage (96 h), the size of the lamellar precipitates and the LPSO was larger than that of the peak-aged, and the spherical β′ phase appeared in peak-aging stage decreased significantly, which reduced its performance.

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Acknowledgements

This work is supported by the Research and development project of scientific and technological achievements in provincial universities of Heilongjiang provincial department of education(Grant number TSTAU-R2018003), Open research fund of state key laboratory of metastable materials science and technology of Yanshan university (Grant number 202002).

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Harbin University of Science and Technology, Harbin, 150040, Heilongjiang, People’s Republic of China

    Yan Zehua, Yu Yandong, Qian Jiahao & Sang Yanchao

  2. Key Laboratory of Advanced Manufacturing and Intelligent Technology, Ministry of Education, Harbin, 150040, Heilongjiang, People’s Republic of China

    Yu Yandong

  3. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, 066004, Hebei, People’s Republic of China

    Luo Junting

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  1. Yan Zehua
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Correspondence to Yu Yandong.

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Yan, Z., Yu, Y., Qian, J. et al. Fabrication of High-Strength Mg–Gd–Nd–Zn–Sn–Zr Alloy via Extrusion and Aging. Met. Mater. Int. 27, 4182–4194 (2021). https://doi.org/10.1007/s12540-020-00859-7

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