通过引入双模态组织和织构再取向工艺来提高AZ31镁合金的室温弯曲性能

何超; 张逸冰; 袁明; 蒋斌; 王庆航; 柴炎福; 黄光胜; 张丁非; 潘复生

doi:10.1007/s12613-021-2384-1

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): 1322-1333

Chao He, Yibing Zhang, Ming Yuan, Bin Jiang, Qinghang Wang, Yanfu Chai, Guangsheng Huang, Dingfei Zhang, and Fusheng Pan, Improving the room-temperature bendability of Mg–3Al–1Zn alloy sheet by introducing a bimodal microstructure and the texture re-orientation, Int. J. Miner. Metall. Mater., 29(2022), No. 7, pp. 1322-1333. https://doi.org/10.1007/s12613-021-2384-1

Cite this article as:

Chao He, Yibing Zhang, Ming Yuan, Bin Jiang, Qinghang Wang, Yanfu Chai, Guangsheng Huang, Dingfei Zhang, and Fusheng Pan, Improving the room-temperature bendability of Mg–3Al–1Zn alloy sheet by introducing a bimodal microstructure and the texture re-orientation, Int. J. Miner. Metall. Mater., 29(2022), No. 7, pp. 1322-1333. https://doi.org/10.1007/s12613-021-2384-1

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研究论文

通过引入双模态组织和织构再取向工艺来提高AZ31镁合金的室温弯曲性能

1)
重庆大学材料科学与工程学院，重庆 400044，中国
2)
湖北工程学院化学与材料科学学院，孝感 432000，中国
3)
重庆大学国家镁合金工程技术研究中心，重庆 400044，中国
4)
扬州大学机械工程学院，扬州 225127，中国
5)
绍兴学院机电工程学院，绍兴 312000，中国

通讯作者:
袁明 E-mail: yuanming@cqu.edu.cn

蒋斌 E-mail: jiangbinrong@cqu.edu.cn

文章亮点

(1) 在轧制态AZ31镁合金板材的变形带区域，观察到晶体c-轴偏离了板材法向。

(2) 通过预压缩退火工艺，在AZ31镁合金板材中引入了双模态组织。

(3) 经过预变形退火后，板材的弯曲性能得到了大幅度的提升。

中文摘要

变形镁合金由于其较强的基面织构，在室温条件下通常表现出很差的弯曲成形性能。本文通过预压缩和退火(PCA)工艺引入双模态组织，显著提高了AZ31合金板材的弯曲成形性能，在60°的V形弯曲模具下，其最终成形角度从112°提升到68°。这种工艺使强基面织构向轧制方向(RD)偏移，导致在RD拉伸应力条件下具有更高的基面滑移施密特因子(SF)。此外，在PCA工艺的退火过程中，应变诱导晶界迁移引起变形晶粒的异常生长，导致晶粒粗化；退火过程的退孪生机制导致细小晶粒的产生；这种再结晶机制的差异导致了PCA试样中双模态组织的产生。而双模态组织的引入打乱了初始热轧AZ31B合金板材的变形带(DBs)的分布，使弯曲试样的外侧拉伸区域的应变分布更加均匀，同时粗大晶粒中产生大量拉伸孪晶。基面滑移和拉伸孪晶的同时产生能更好的协调弯曲试样外侧的拉伸应变。因此，双模态组织、基面织构的偏移和变形带的重新分布是AZ31合金弯曲性能显著提高的主要原因。

关键词:

Research Article

Improving the room-temperature bendability of Mg–3Al–1Zn alloy sheet by introducing a bimodal microstructure and the texture re-orientation

+ Author Affiliations

1)
State Key Laboratory of Mechanical Transmissions, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China
2)
School of Chemistry and Materials Science, Hubei Engineering University, Xiaogan 432000, China
3)
National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing 400044, China
4)
School of Mechanical Engineering, Yangzhou University, Yangzhou 225127, China
5)
School of Mechanical and Electrical Engineering, Shaoxing University, Shaoxing 312000, China

Corresponding authors:
Ming Yuan E-mail: yuanming@cqu.edu.cn

Bin Jiang E-mail: jiangbinrong@cqu.edu.cn
Received: 27 July 2021; Revised: 27 October 2021; Accepted: 16 November 2021; Available online: 19 November 2021

Abstract

Abstract

A significant enhancement of bendability was achieved by the introduction of bimodal microstructure for AZ31B alloy sheets via pre-compression and subsequent annealing (PCA) process. This combined treatment led to the c-axis of the extracted samples that were inclined by 30° to the rolling direction (30° sample) further shifting toward the rolling direction (RD) and resulting in a higher Schmid factor (SF) value of basal slip under the RD tensile stress. Furthermore, the bimodal microstructure that was introduced by the PCA process broke the damage bands (DBs) in the initial hot rolled AZ31B alloy sheets and gave rise to a more uniform strain distribution in the outer tension region of the bending samples, in which the tensile deformation was accommodated by the equally distributed {$ 10\bar{1} 2$} tension twinning and basal slip. Consequently, the bimodal microstructure, shifted basal texture and the modification of DBs were responsible for the significant enhancement in the bendability of the AZ31 alloys.
- magnesium alloy;
- pre-compression;
- texture;
- bimodal microstructure;
- bendability

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