Effects of Li addition on the microstructure and tensile properties of the extruded Mg–1Zn–<i>x</i>Li alloy

Jun Zhao; Bin Jiang; Qinghang Wang; Ming Yuan; Yanfu Chai; Guangsheng Huang; Fusheng Pan

doi:10.1007/s12613-021-2340-0

Volume 29 Issue 7

Jul. 2022

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2022 > 29(7): 1380-1387

Jun Zhao, Bin Jiang, Qinghang Wang, Ming Yuan, Yanfu Chai, Guangsheng Huang, and Fusheng Pan, Effects of Li addition on the microstructure and tensile properties of the extruded Mg–1Zn–xLi alloy, Int. J. Miner. Metall. Mater., 29(2022), No. 7, pp. 1380-1387. https://doi.org/10.1007/s12613-021-2340-0

Cite this article as:

Jun Zhao, Bin Jiang, Qinghang Wang, Ming Yuan, Yanfu Chai, Guangsheng Huang, and Fusheng Pan, Effects of Li addition on the microstructure and tensile properties of the extruded Mg–1Zn–xLi alloy, Int. J. Miner. Metall. Mater., 29(2022), No. 7, pp. 1380-1387. https://doi.org/10.1007/s12613-021-2340-0

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Research Article

Effects of Li addition on the microstructure and tensile properties of the extruded Mg–1Zn–xLi alloy

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Corresponding author:
Bin Jiang E-mail: jiangbinrong@cqu.edu.cn
Received: 14 May 2021; Revised: 16 August 2021; Accepted: 17 August 2021; Available online: 18 August 2021

Abstract

Abstract

Li addition is verified to be an effective method to increase the room temperature ductility and formability of Mg alloys. In the present study, the microstructure, texture, and tensile properties of the extruded Mg–1Zn–xLi (wt%, x = 0, 1, 3, 5) alloy sheets were studied by X-ray diffraction (XRD), scanning electron microscope (SEM), and electron backscatter diffraction (EBSD). It was found that Li addition resulted in the grain coarsening and the development of new transverse direction (TD)-tilting and $\langle 10\bar{1}0\rangle$ parallel to extrusion direction textures, which was related to the improved dynamic recrystallization and the increased prismatic slip during extrusion. The Mg–1Zn–5Li sheet showed the weakest texture, which contained both basal and TD-tilting oriented grains. No additional phase was formed with Li addition. The yield strength of Mg–1Zn–xLi sheets gradually decreased with increasing Li content, which was mainly related to the grain coarsening and texture weakening. In addition, the ductility of the Mg–1Zn–xLi sheet was remarkably enhanced by Li addition. The elongation of the Mg–1Zn–5Li sheet was 30.3% along the TD, which was three times than that of Mg–1Zn sheet. Microstructural analysis implied that this significant ductility enhancement was associated with the improvement activation of prismatic and basal slips during the tensile tests. This study may provide insights into the development of high-ductility, low-density Mg–Zn–Li based alloys.
- Mg–1Zn–xLi alloy;
- texture;
- prismatic slip;
- tensile properties

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