Effect of multi-gradient structure on mechanical properties of Al-Zn-Mg-Cu alloy

被引：1
作者：
Su S. [1 ]
Yang M. [1 ,2 ]
Tang Y. [1 ]
Yang Y. [1 ]
Yang G. [1 ]
Luo P. [1 ]
机构：
[1] School of Materials Science and Metallurgical Engineering, Guizhou University, Guiyang
[2] National & Local Joint Engineering Laboratory for High-performance Metal Structure Material and Advanced Manufacturing Technology, Guiyang
来源：
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2023年 / 54卷 / 07期
关键词：
7075 aluminum alloy; multi-gradient structures; strengthening mechanism; ultrasonic surface rolling process;
D O I：
10.11817/j.issn.1672-7207.2023.07.012
中图分类号：
学科分类号：
摘要：
In order to further improve the strength of precipitation strengthened aluminum alloy, ultrasonic surface rolling process and low temperature aging were used to fabricate a multi-gradient structure. The surface deformation microstructure was characterized by SEM/TEM. The results show that the surface grains and precipitates show gradient distribution. In addition, there are differences in the types of grain boundary precipitates and grain interior precipitates with gradient structure, and the number density of grain boundary precipitates and grain interior precipitates decreases with the increase of the depth from the surface. Compared with the coarse grained sample after solution treatment, the multi-gradient structure improves the strength (yield strength and ultimate tensile strength improves from 223 MPa and 425 MPa to 562 MPa and 692 MPa, respectively) and maintains excellent plasticity. And the strengthening increment of multi-gradient structure sample is quantitatively calculated, and the high strength of multi-gradient structure originates from grain boundary strengthening, precipitation strengthening, dislocation strengthening and synergistic strengthening. © 2023 Central South University of Technology. All rights reserved.
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页码：2651 / 2662
页数：11
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