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Effect of Deformation Temperatures on Microstructure of AQ80 Magnesium Alloy under Repeated Upsetting-Extrusion

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

A new repeated upsetting-extrusion (RUE) process was proposed to improve the microstructure and the mechanical properties of Mg alloys. The effects of deformation temperature on the microstructure and microhardness of RUEed AQ80 Mg alloy were studied. The results showed that Mg alloy is subjected to sufficient corner shear deformation, upsetting deformation, and extrusion deformation, resulting in a large and uniformly distributed effective strain after RUE deformation. The microstructure is refined to an average grain size of 2.1 μm by the continuous dynamic recrystallization (CDRX) mechanism at 250 °C. As the temperature increases to 300 °C, the discontinuous dynamic recrystallization (DDRX) mechanism is activated and the average grain size is refined to 1.6 µm by the combined effect of CDRX and DDRX. In comparison to their parent grains, the orientations of the CDRXed grains show a clearly preferred orientation, but those of the DDRXed grains are completely different. At 350 °C, {10-12} extension twins appear in the microstructure, and the twinning-induced recrystallization (TDRX) mechanism plays an important role in grain refinement. With the two strengthening mechanisms of fine-grained strengthening and dislocation strengthening, the microhardness of the 250 °C sample is greatly improved, with an increase of about 35.1% compared to the initial sample.

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Acknowledgements

This work was partly supported by the National Natural Science Foundation of China (Grant Nos. 52174362 and 51975207), the Natural Science Foundation of Hunan Province (Grant no. 2023JJ10020 & 2021JJ30257), the Xiangtan Special Project for Building a National Innovative City (Grant No. CG-YB20221043), the Yancheng “Talent Plan of Yellow Sea Pearl” for Leading Talent Project.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Hunan University of Science and Technology, Xiangtan, 411201, China

    Yutian Fan, Liwei Lu & Zhiqiang Wu

  2. College of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450001, China

    Hongliang Zhao

  3. School of Material Science and Engineering, North University of China, Taiyuan, 030051, China

    Yong Xue

  4. School of Metallurgical Engineering, National and Local Joint Engineering Research Center for Functional Materials Processing, Xi’an University of Architecture and Technology, Xi’an, 710055, China

    Wen Wang

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  1. Yutian Fan
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Correspondence to Liwei Lu, Hongliang Zhao or Wen Wang.

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Fan, Y., Lu, L., Zhao, H. et al. Effect of Deformation Temperatures on Microstructure of AQ80 Magnesium Alloy under Repeated Upsetting-Extrusion. Acta Metall. Sin. (Engl. Lett.) 36, 1649–1664 (2023). https://doi.org/10.1007/s40195-023-01562-3

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