Effect of surface severe plastic deformation on microstructure and hardness of Al alloy sheet with enhanced precipitation

被引：7
|
作者：
Zhang, Hai [1 ]
He, Zhiyan [1 ]
Gao, Wenbin [2 ]
机构：
[1] Civil Aviat Univ China, Coll Aeronaut Engn, Tianjin 300300, Peoples R China
[2] Jiangsu Univ Sci & Technol, Dept Mat Sci & Engn, Zhenjiang 212000, Peoples R China
来源：
MATERIALS LETTERS | 2023年 / 333卷
基金：
中国国家自然科学基金;
关键词：
Severe plastic deformation; Aluminum alloy; Precipitated phase; Sheet; Hardness; BEHAVIOR; PHASE;
D O I：
10.1016/j.matlet.2022.133632
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The effect of severe plastic deformation on microstructure and hardness of 7075 aluminum alloy sheet presented different results from that of thick samples in previous study. Grains were not refined obviously, and precipitation phases MgZn2 were massively dissolved in the matrix in the region close to the surface. Varied density of dislocations were produced at different depths. The depth of severe plastic deformation layer was 40-70 mu m, while the affected depth of hardness was much deeper. The maximum hardness enhancement, 16% increase compared to the core hardness, appeared at about 150-250 mu m below surface. The hardness change depended on the competition between the roles of precipitation dissolution and dislocation multiplication.
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页数：4
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