退火处理对温轧Mg-Zn-Gd-Ca-Mn合金微观组织及力学性能的影响

宋宜帆; 李希海; 许金良; 张凯; 毛耀宗; 闫宏; 李辉平; 陈荣石

doi:10.1007/s12613-023-2812-5

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文章导航 > 矿物冶金与材料学报（英文） > 2024 > 二校

Yifan Song, Xihai Li, Jinliang Xu, Kai Zhang, Yaozong Mao, Hong Yan, Huiping Li, and Rongshi Chen, Effect of annealing treatment on the microstructure and mechanical properties of warm-rolled Mg–Zn–Gd–Ca–Mn alloys, Int. J. Miner. Metall. Mater.,(2024). https://doi.org/10.1007/s12613-023-2812-5

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Yifan Song, Xihai Li, Jinliang Xu, Kai Zhang, Yaozong Mao, Hong Yan, Huiping Li, and Rongshi Chen, Effect of annealing treatment on the microstructure and mechanical properties of warm-rolled Mg–Zn–Gd–Ca–Mn alloys, Int. J. Miner. Metall. Mater.,(2024). https://doi.org/10.1007/s12613-023-2812-5

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研究论文

退火处理对温轧Mg-Zn-Gd-Ca-Mn合金微观组织及力学性能的影响

1)
山东科技大学材料科学与工程学院, 青岛266590, 中国
2)
中科院金属研究所师昌绪先进材料创新中心, 沈阳 110016, 中国
3)
滨州魏桥国科高等技术研究院山东省先进铝基材料与技术重点实验室, 滨州 256606, 中国

通讯作者:
闫宏 E-mail: yanhong5871@163.com

陈荣石 E-mail: rschen@imr.ac.cn

文章亮点

(1) 薄轧板的晶粒尺寸和相应的力学性能对退火温度极为敏感

(2) 退火温度影响第二相的数量，从而影响晶粒尺寸和力学性能

(3) 可以通过温轧和退火来控制强−塑性平衡

中文摘要

针对AZ31等传统镁合金易形成基面织构、室温塑性差的问题，利用稀土和钙等溶质原子的独特作用，设计了一种多元微合金化高塑性Mg–1.8Zn–0.8Gd–0.1Ca–0.2Mn材料，研究了退火工艺对温轧板材晶粒尺寸、第二相、织构和室温力学性能的影响规律，以期通过退火调控合金组织和织构，为工业生产工艺提供指导。结果表明退火温度对组织和性能影响显著：轧制态合金内存在少量较大尺寸的块状相和沿着轧制方向的长串相，以及晶粒内部细小的球状和棒状颗粒相；随退火温度的增加，晶粒尺寸先减少后增加，第二相形貌、数量和尺寸发生变化，其中在350°C时发生完全再结晶，450°C晶内颗粒相消失，晶粒尺寸突增；300~350°C为完全再结晶阶段，呈现最优的强塑性综合力学性能，轧向和横向的屈服强度分别为182.1 MPa和176.9 MPa，抗拉强度为271.1 MPa和275.8 MPa，伸长率分别达到27.4%和32.3%。此外，该合金中仍然存在一些较大尺寸的相，影响其力学性能尤其是塑性，该材料还有提升空间。

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Research Article

Effect of annealing treatment on the microstructure and mechanical properties of warm-rolled Mg–Zn–Gd–Ca–Mn alloys

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Abstract

Abstract

The basal texture of traditional magnesium alloy AZ31 is easy to form and exhibits poor plasticity at room temperature. To address these problems, a multi-micro-alloyed high-plasticity Mg–1.8Zn–0.8Gd–0.1Ca–0.2Mn (wt%) alloy was developed using the unique role of rare earth and Ca solute atoms. In addition, the influence of the annealing process on the grain size, second phase, texture, and mechanical properties of the warm-rolled sheet at room temperature was analyzed with the goal of developing high-plasticity magnesium alloy sheets and obtaining optimal thermal-mechanical treatment parameters. The results show that the annealing temperature has a significant effect on the microstructure and properties due to the low alloying content: there are small amounts of larger-sized block and long string phases along the rolling direction, as well as several spherical and rodlike particle phases inside the grains. With increasing annealing temperature, the grain size decreases and then increases, and the morphology, number, and size of the second phase also change correspondingly. The particle phase within the grains vanishes at 450°C, and the grain size increases sharply. In the full recrystallization stage at 300–350°C, the optimum strength–plasticity comprehensive mechanical properties are presented, with yield strengths of 182.1 and 176.9 MPa, tensile strengths of 271.1 and 275.8 MPa in the RD and TD, and elongation values of 27.4% and 32.3%, respectively. Moreover, there are still some larger-sized phases in the alloy that influence its mechanical properties, which offers room for improvement.
- Mg–Zn–Gd–Ca–Mn alloy;
- annealing treatment;
- microstructure;
- texture;
- dynamic recrystallization;
- mechanical properties

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