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Characterization of Hot-Extruded Mg–Gd–Y–Zn–Zr Alloy Containing a Novel Lamellar Structure and Related High Elevated-Temperature Mechanical Properties

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Abstract

Hot extrusion was introduced to the Mg–10Gd–3Y–1.5Zn–0.5Zr alloy and microstructure evolution, texture configuration and elevated-temperature mechanical properties were investigated. The results show that the LPSO phase network-distributed along grain boundaries in the as-cast and homogenized alloys is broken and elongated after extrusion, and is streamlined along the extrusion direction (ED). After extrusion, a completely recrystallized microstructure with equiaxed grains of ~ 10 μm is formed. The most notable feature in as-extruded alloy is numerous fine lamellar structures in DRXed grains, which were identified as basal stacking faults (SFs) with nano-spaced by TEM analysis. The < 0001 > //TD texture results in the hard orientation of most grains along ED. The extruded alloy exhibits excellent elevated-temperature mechanical properties (UTS/287 MPa and YS/218 MPa at 300 °C; UTS > 200 MPa at 350 °C) along ED, which is significantly higher than alloys with similar composition or even higher rare earth content. The high elevated-temperature strength is mainly related to the fiber strengthening effect of streamline-distributed LPSO, the skeleton support effect of numerous SFs with nano spacing, and the texture strengthening effect of hard grain orientation.

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The data that support the findings of this study are available on request from the corresponding author. The data are not publicly available due to privacy or ethical restrictions.

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Acknowledgements

The authors are grateful for the financial supported by The National Natural Science Foundation of China (U1837207).

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National Natural Science Foundation of China, U1837207, Yuanchun Huang.

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Authors and Affiliations

  1. Light Alloy Research Institute, Central South University, Changsha, 410083, China

    Xu Wang, Yongxing Zhao & Yuanchun Huang

  2. State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha, 410083, China

    Xu Wang, Yongxing Zhao & Yuanchun Huang

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XW was involved in conceptualization, investigation, methodology, results analysis, writing original draft. YH contributed to funding acquisition, review and editing, project administration. YZ was involved in investigation, validation and methodology.

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Correspondence to Yuanchun Huang.

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Wang, X., Zhao, Y. & Huang, Y. Characterization of Hot-Extruded Mg–Gd–Y–Zn–Zr Alloy Containing a Novel Lamellar Structure and Related High Elevated-Temperature Mechanical Properties. Met. Mater. Int. 29, 2556–2570 (2023). https://doi.org/10.1007/s12540-023-01391-0

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