Li含量对挤压态Mg–1Zn合金显微组织与力学性能的影响

赵俊; 蒋斌; 王庆航; 袁明; 柴炎福; 黄光胜; 潘复生

doi:10.1007/s12613-021-2340-0

Volume 29 Issue 7

Jul. 2022

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文章导航 > 矿物冶金与材料学报（英文） > 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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研究论文

Li含量对挤压态Mg–1Zn合金显微组织与力学性能的影响

1)
湖南城市学院机械与电气工程学院，益阳 413002，中国
2)
重庆大学材料科学与工程学院机械传动国家重点实验室，重庆 400044, 中国
3)
扬州大学机械工程学院，扬州 225127，中国
4)
绍兴文理学院机械与电气工程学院，绍兴 312000，中国

通讯作者:
蒋斌 E-mail: jiangbinrong@cqu.edu.cn

文章亮点

(1) 系统地研究了Li含量对Mg–Zn合金微观组织的影响规律。

(2) 研究Li元素添加对Mg–Zn合金力学性能的影响并讨论了其中的微观变形机理。

(3) Li元素添加有效激活启动非基面滑移大幅提升Mg–Zn合金塑性。

中文摘要

Li元素的添加被认为是提高镁合金室温塑性和成形性的有效方法。本文通过X射线衍射仪(XRD)、扫描电子显微镜(SEM)和背散射电子衍射仪(EBSD)研究了Li含量对挤压Mg–1Zn–xLi (x = 0、1、3和5，质量分数，wt%)合金板材的显微组织、织构和拉伸性能。结果表明，随着Li含量的增加，挤压板材的平均晶粒尺寸逐渐长大，并形成了新的沿横向(TD)倾斜的织构和< 101̅0 >平行于挤压方向的织构。主要原因是由于挤压过程中加快了动态再结晶行为和更多的柱面滑移被激活启动。Li的添加无法形成了新的颗粒相。拉伸性能结果表明，Li的添加降低了挤压Mg–1Zn–xLi合金板材的屈服强度，这主要是由于晶粒粗化和织构弱化。此外，Li的添加显著提高了Mg–1Zn–xLi板材的塑性。相比于Mg–1Zn合金板材，Mg–1Zn–5Li合金板材沿TD方向拉伸时延伸率为30.3%，整整提高了三倍。主要原因是由于在室温拉伸过程中更多的柱面滑移被激活启动。本研究可为开发高塑性、低密度的Mg–Zn–Li基合金提供新的思路。

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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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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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