轧制温度和后处理方式对AZ31镁合金显微组织和力学性能的影响

doi:10.13251/j.issn.0254-6051.2023.03.011

金属热处理 ›› 2023, Vol. 48 ›› Issue (3): 62-70.DOI: 10.13251/j.issn.0254-6051.2023.03.011

轧制温度和后处理方式对AZ31镁合金显微组织和力学性能的影响

宋先和¹, 刘晓烨¹, 毕仁贵¹, 卢立伟², 刘雁峰^1,3, 黄熙鸿¹

1.吉首大学物理与机电工程学院, 湖南湘西 416000;
2.湖南科技大学材料科学与工程学院, 湖南湘潭 411201;
3.吉首大学先进装备轻量化与智能化研究中心, 湖南湘西 416000

收稿日期:2022-10-20 修回日期:2023-02-07 出版日期:2023-03-25 发布日期:2023-04-25
通讯作者: 毕仁贵,副教授,博士,E-mail:birengui@jsu.edu.cn。
作者简介:宋先和(1995—),男,硕士研究生,主要研究方向为镁合金塑性成形,E-mail:2331233886@qq.com。
基金资助:
国家自然科学基金面上项目(51975207); 湖南省大学生创新训练计划(020403822); 吉首大学引进人才项目(jsdxrcyjkyxm201602)

Effect of rolling temperature and post-treatment on microstructure and mechanical properties of AZ31 magnesium alloy

Song Xianhe¹, Liu Xiaoye¹, Bi Rengui¹, Lu Liwei², Liu Yanfeng^1,3, Huan Xihong¹

1. School of Physics and Electromechanical Engineering, Jishou University, Xiangxi Hunan 416000, China;
2. School of Materials Science and Engineering, Hunan University of Science and Technology, Xiangtan Hunan 411201, China;
3. Advanced Equipment Lightweight and Intelligent Research Center, Jishou University, Xiangxi Hunan 416000, China

Received:2022-10-20 Revised:2023-02-07 Online:2023-03-25 Published:2023-04-25

摘要/Abstract

摘要： 在不同的轧制温度下,对AZ31镁合金板进行轧制,然后取出轧板立即进行水冷、空冷和退火3种不同的后处理。探究轧制温度和后处理对镁合金显微组织和力学性能的影响。结果表明,轧制温度为250、300 ℃时,水冷和空冷处理后板材存在着大量的孪晶,350 ℃时由于轧制温度较高,孪晶的数量很少;水冷处理后的平均晶粒尺寸要小于空冷,空冷处理之后的孪晶数量略少于水冷,当轧制温度为350 ℃时,退火处理后,晶粒尺寸减小,晶粒趋于等轴状,晶格畸变程度低。在相同的轧制温度下,水冷处理的镁合金板材的屈服强度、抗拉强度和硬度较高;退火处理后可以显著提高板材的伸长率,但屈服强度、抗拉强度略有下降。轧制温度升高时,3种后处理方式之间屈服强度和抗拉强度的最大差值会减小。

关键词: 镁合金, 轧制, 热处理, 显微组织, 力学性能

Abstract: AZ31 magnesium alloy plates were rolled at different temperatures, and the rolled plates were immediately subjected to different post-treatments (water cooling, air cooling and annealing). The effects of rolling temperature and post-treatment on microstructure and mechanical properties of the tested magnesium alloy were investigated. The results show that when rolled at 250 ℃ and 300 ℃, there are a lot of twins in the plates after water cooling and air cooling. When rolled at 350 ℃, the number of twins is small due to the higher rolling temperature, the average grain size after water cooling is smaller than that after air cooling, and the number of twins after air cooling is slightly smaller than that after water cooling. After annealing following the 350 ℃ rolling, the grains tend to be equiaxed and finer with low lattice distortion. At the same rolling temperature, the yield strength, tensile strength and hardness of the rolled alloy plate after water cooling are higher than that of other treatments. After annealing, the elongation of the plates can be significantly increased, but the yield strength and tensile strength are slightly decreased. When the rolling temperature increases, the maximum difference of yield strength and tensile strength between the three post-treatment methods decreases.

Key words: magnesium alloy, rolling, heat treatment, microstructure, mechanical properties

中图分类号:

TG166.4

宋先和, 刘晓烨, 毕仁贵, 卢立伟, 刘雁峰, 黄熙鸿. 轧制温度和后处理方式对AZ31镁合金显微组织和力学性能的影响[J]. 金属热处理, 2023, 48(3): 62-70.

Song Xianhe, Liu Xiaoye, Bi Rengui, Lu Liwei, Liu Yanfeng, Huan Xihong. Effect of rolling temperature and post-treatment on microstructure and mechanical properties of AZ31 magnesium alloy[J]. Heat Treatment of Metals, 2023, 48(3): 62-70.

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轧制温度和后处理方式对AZ31镁合金显微组织和力学性能的影响

Effect of rolling temperature and post-treatment on microstructure and mechanical properties of AZ31 magnesium alloy

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