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Microstructure and Yield Plateau of an Annealed Extruded Mg-Y-Cu Alloy

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Abstract

The microstructure and yield plateau of an annealed extruded Mg-6.8Y-2.5Cu alloy were investigated. During the annealing process, the 18R-LPSO phase transformed into a 14H-LPSO phase. With increasing annealing time, the grain size increased while the number of dislocations decreased in the extruded alloy. Uneven plastic deformation occurred in the annealed alloy during the yield stage, accompanied by Lüders band formation. The yield strain significantly decreased with extended annealing time. Dislocation multiplication and interactions between dislocations and solute atoms or second phases led to the formation of yielding phenomenon in both extruded and annealed alloys. The grain size and dislocation density affected the yield strain of the annealed alloy, and their corresponding influence mechanisms were evaluated for different annealing time.

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Acknowledgments

This work was financially supported by National Natural Science Foundations of China (Nos. 52261027, 52001152 and 51961021), Project supported by the Natural Science Foundation of Gansu Province, China (No. 22JR5RA251), Undergraduate Innovation and Entrepreneurship Training Program (Nos. DC20231188, DC20231482 and DC20231558), and Sinoma Institute of Materials Research (Guang Zhou) Co., Ltd (SIMR) for hel** TEM/SEM work.

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Authors and Affiliations

  1. State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou, 730050, China

    Guangli Bi, Hao Yan, **g Jiang, Lin Tong, Yuandong Li & Tijun Chen

  2. School of Material Science and Engineering, Lanzhou University of Technology, Lanzhou, 730050, China

    Guangli Bi, Hao Yan, **g Jiang, Lin Tong, Yuandong Li & Tijun Chen

  3. School of Applied Technology, Changchun Institute of Technology, Changchun, 130012, China

    Haidong Wang

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  1. Guangli Bi
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Bi, G., Yan, H., Jiang, J. et al. Microstructure and Yield Plateau of an Annealed Extruded Mg-Y-Cu Alloy. J. of Materi Eng and Perform (2024). https://doi.org/10.1007/s11665-024-09639-5

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