新型高强度Mg–0.6Mn–0.5Al–0.5Zn–0.4Ca合金的热变形行为

陈浩; 杨艳美; 胡琮霖; 周港; 时慧; 蒋根智; 黄原定; Norbert Hort; 谢卫东; 魏国兵

doi:10.1007/s12613-023-2706-6

Volume 30 Issue 12

Dec. 2023

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文章导航 > 矿物冶金与材料学报（英文） > 2023 > 30(12): 2397-2410

Hao Chen, Yanmei Yang, Conglin Hu, Gang Zhou, Hui Shi, Genzhi Jiang, Yuanding Huang, Norbert Hort, Weidong Xie, and Guobing Wei, Hot deformation behavior of novel high-strength Mg–0.6Mn–0.5Al–0.5Zn–0.4Ca alloy, Int. J. Miner. Metall. Mater., 30(2023), No. 12, pp. 2397-2410. https://doi.org/10.1007/s12613-023-2706-6

Cite this article as:

Hao Chen, Yanmei Yang, Conglin Hu, Gang Zhou, Hui Shi, Genzhi Jiang, Yuanding Huang, Norbert Hort, Weidong Xie, and Guobing Wei, Hot deformation behavior of novel high-strength Mg–0.6Mn–0.5Al–0.5Zn–0.4Ca alloy, Int. J. Miner. Metall. Mater., 30(2023), No. 12, pp. 2397-2410. https://doi.org/10.1007/s12613-023-2706-6

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研究论文

新型高强度Mg–0.6Mn–0.5Al–0.5Zn–0.4Ca合金的热变形行为

1)
重庆大学国家镁合金工程技术研究中心, 重庆 400044, 中国
2)
Institute of Metallic Biomaterials, Helmholtz-Zentrum Hereon, Max-Planck-Str. 1, D-21502 Geesthacht, Germany

通讯作者:
谢卫东 E-mail: wdxie@cqu.edu.cn

魏国兵 E-mail: guobingwei@cqu.edu.cn

文章亮点

(1) 研究了Mg–0.6Mn–0.5Al–0.5Zn–0.4Ca合金不同温度和应变速率的热压缩应力–应变规律。

(2) 建立并分析了合金的本构方程和加工图，为预测和优化合金热变形行为提供了依据。

(3) 研究揭示了合金热变形微观结构和织构变化规律，探索了合金构效关系。

中文摘要

发展低成本高性能镁合金及其加工技术是拓展镁合金应用的重要方向之一，本文通过热压缩、微观组织表征等，重点研究了原材料成本低、强度高的Mg–0.6Mn–0.5Al–0.5Zn–0.4Ca的热变形行为。借助Gleeble-3500热模拟机获得了挤压态Mg–0.6Mn–0.5Al–0.5Zn–0.4Ca合金温度523至673 K，应变速率0.001至1 s⁻¹的应力–应变曲线。结果显示，应变速率增加，变形温度降低，真应力均增加。建立并分析了该合金的本构方程和加工图，推荐的热变形加工区域为，在573–623 K温度范围内，最佳应变速率为0.001–0.01 s⁻¹；在623–673 K温度范围内，最佳应变速率为0.001–0.1 s⁻¹。利用电子背散射衍射技术（EBSD）研究了应变速率、变形温度对合金微观结构及织构的影响。发现挤压态合金呈现出由粗大的变形晶粒和细小等轴晶组织（约1.57 μm）组成的双峰结构。热变形后，合金再结晶程度和平均晶粒尺寸增加，且变形温度越高，增加幅度越大。与此同时，位错密度和织构强度下降。在0.01 s⁻¹的应变速率下，随着变形温度的增加，织构强度减弱，大多数晶粒的{0001}晶面逐渐偏离压缩方向。此外，当应变速率降低时，再结晶程度和平均晶粒尺寸增加，位错密度下降。有趣的是，织构对应变速率的变化并不敏感。这些发现为了解Mg–0.6Mn–0.5Al–0.5Zn–0.4Ca合金的热压缩行为、显微结构演变和织构变化提供了有益的见解，有助于深化对其加工–微观结构–性能关系的理解。

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Research Article

Hot deformation behavior of novel high-strength Mg–0.6Mn–0.5Al–0.5Zn–0.4Ca alloy

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Abstract

Abstract

The hot compression behavior of as-extruded Mg–0.6Mn–0.5Al–0.5Zn–0.4Ca alloy was studied on a Gleeble-3500 thermal simulation machine. Experiments were conducted at temperatures ranging from 523 to 673 K and strain rates ranging from 0.001 to 1 s⁻¹. Results showed that an increase in the strain rate or a decrease in deformation temperature led to an increase in true stress. The constitutive equation and processing maps of the alloy were obtained and analyzed. The influence of deformation temperatures and strain rates on microstructural evolution and texture was studied with the assistance of electron backscatter diffraction (EBSD). The as-extruded alloy exhibited a bimodal structure that consisted of deformed coarse grains and fine equiaxed recrystallized structures (approximately 1.57 μm). The EBSD results of deformed alloy samples revealed that the recrystallization degree and average grain size increased as the deformation temperature increased. By contrast, dislocation density and texture intensity decreased. Compressive texture weakened with the increase in the deformation temperature at the strain rate of 0.01 s⁻¹. Most grains with {0001} planes tilted away from the compression direction (CD) gradually. In addition, when the strain rate decreased, the recrystallization degree and average grain size increased. Meanwhile, the dislocation density decreased. Texture appeared to be insensitive to the strain rate. These findings provide valuable insights into the hot compression behavior, microstructural evolution, and texture changes in the Mg–0.6Mn–0.5Al–0.5Zn–0.4Ca alloy, contributing to the understanding of its processing–microstructure–property relationships.
- high-strength Mg alloy;
- conventional extrusion;
- fine grains;
- hot deformation behavior;
- constitutive relationship;
- microstructural evolution

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