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High-temperature mechanical properties of as-extruded AZ80 magnesium alloy at different strain rates

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Abstract

The mechanical properties of as-extruded AZ80 magnesium alloy at temperatures of 450–525°C and strain rates of 3.0 s−1 and 0.15 s−1 were investigated by tensile tests. Zero ductility of alloy appeared at 500°C with a strain rate of 0.15 s−1, while the zero strength and zero ductility of the alloy were obtained nearly simultaneously at 525°C with a strain rate of 3.0 s−1. The results indicated that the lower strain rate accelerated the arrival of zero ductility. As the temperature increased, the failure mode of the alloy developed from trans-granular fracture to cleavage fracture and then to inter-granular fracture with the feature of sugar-like grains and fusion traces. The existence of the low-melting composite of β-Mg17Al12 and Al8Mn5 particles segregated near the Mg17Al12 phase along grain boundaries were demonstrated to be the reason for the brittle fracturing of the AZ80 alloy at high temperatures. Furthermore, microstructural evolution at temperatures approaching the solidus temperature was discussed to clarify magnesium alloy’s high temperature deformation mechanism.

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Acknowledgements

This work is financially supported by the National Natural Science Foundation of China (Nos. U1910213, 52001037, and U207601), the Chongqing Science and Technology Commission, China (Nos. cstc2020jcyj-msxmX0184 and cstc2019jscx-mbdxX0031), the University Innovation Research Group of Chongqing, China (No. CXQT20023), the Qinghai Scientific and Technological Plan Projects, China (No. 2018-GX-A1), and the Scientific Research Foundation of Chongqing University of Technology, China.

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Authors and Affiliations

  1. College of Materials Science and Engineering, Chongqing University of Technology, Chongqing, 400054, China

    Wenjun Liu, Hongchen Xiang, Qing Ye, Shengqi Xia, Yanlong Ma & Mingbo Yang

  2. College of Materials Science and Engineering, Chongqing University, Chongqing, 400044, China

    Bin Jiang, Siqiang Chen & Jiangfeng Song

  3. Chongqing Tsingshan Industrial, Chongqing, 402761, China

    Wenjun Liu

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  1. Wenjun Liu
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  3. Hongchen Xiang
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Correspondence to Wenjun Liu or Bin Jiang.

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Liu, W., Jiang, B., Xiang, H. et al. High-temperature mechanical properties of as-extruded AZ80 magnesium alloy at different strain rates. Int J Miner Metall Mater 29, 1373–1379 (2022). https://doi.org/10.1007/s12613-022-2456-x

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