Microstructure and Mechanical Properties of Heterogeneous AZ91 Magnesium Alloy Prepared by Controlling Extrusion Ratio

被引：0
|
作者：
Liu K. [1 ,2 ]
Zhang B. [1 ,2 ]
Huang G. [1 ,2 ]
Jiang B. [1 ,2 ]
Tang A. [1 ,2 ]
Pan F. [1 ,2 ]
机构：
[1] State Key Laboratory of Mechanical Transmission, College of Materials Science and Engineering, Chongqing University, Chongqing
[2] National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing
来源：
Cailiao Daobao/Materials Reports | 2022年 / 36卷 / 20期
基金：
中国国家自然科学基金;
关键词：
heterogeneous deformation induced (HDI) strengthening; heterostructure; magnesium alloy; mechanical property; microstructure;
D O I：
10.11896/cldb.21050132
中图分类号：
学科分类号：
摘要：
AZ91 bars with heterogeneous or uniform structure were prepared by controlling the extrusion ratio, using commercial hot-rolled AZ91 as experimental materials. The microstructure and tensile properties of the bars were studied by optical microscope (OM), scanning electron microscope (SEM), electron backscattering diffraction (EBSD) and universal testing machine. The results show that the strength and ductility of the extruded alloy (AE7, AE11, AE17 and AE26) are significantly improved, compared with the original rolled (R) and rolled annealed (RA) alloy. In addition, AE7 presents a uniform fine-grain structure with the highest strength but the worst ductility, while AE26 obtains a uniform coarse-grain structure with the highest ductility but the lowest strength. Differently, AE11 and AE17 show heterogeneous structure with a mixture of coarse and fine grains, and AE11 has the best combination of strength and ductility, which is not only attributed to the fine grain strengthening and hard orientation of grains. Also, the heterogeneous deformation induced (HDI) strengthening plays an important role in the deformation process. © 2022 Cailiao Daobaoshe/ Materials Review. All rights reserved.
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