Effect of two-stage peak ageing on microstructure and mechanical properties of ultra-high strength Al-Zn-Mg Cu alloy

被引：0
|
作者：
Han B.-S. [1 ]
Zeng Y.-S. [1 ]
Rong G. [1 ]
Liu Y.-F. [1 ]
Ma X.-G. [1 ]
Xu Y.-J. [1 ]
Han X.-Q. [1 ]
机构：
[1] Department of Materials Application Research, AVIC Manufacturing Technology Institute, Beijing
来源：
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | 2022年 / 32卷 / 03期
基金：
中国国家自然科学基金;
关键词：
Elongation; Pre-ageing; Precipitate; Precipitation free zone; Ultra-high strength Al alloy;
D O I：
10.11817/j.ysxb.1004.0609.2021-42436
中图分类号：
学科分类号：
摘要：
The ultra-high strength Al-Zn-Mg-Cu alloy of 800 MPa is of great significance to the lightweight of the aviation structure, but the fracture elongation fluctuates greatly at present. In this paper, a two-stage peak ageing process was proposed. The microstructures and mechanical properties of the alloys treated by single-stage ageing at 120 ℃, first-stage ageing at 80 ℃ and second-stage ageing at 120 ℃ were systematically compared. The results show that after the first-stage ageing treatment, high-density GP zones precipitate in the matrix, which promotes the formation of fine dispersion η’ phase during the second-stage ageing process. Compared with the single-stage ageing state, the width of precipitation free zone (PFZ) at grain boundary is reduced. When the second ageing time is between 8-10 h, the strength is the highest and the elongation is more than 10%. The decrease of the width of PFZ at grain boundary is the direct reason for the increase of elongation. © 2022, China Science Publishing & Media Ltd. All right reserved.
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页码：679 / 691
页数：12
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