Optimization of high-strength Al-Zn-Mg-Cu series aluminum alloy with Zr and Sr additions by heat treatment

被引：0
|
作者：
Zhang X. [1 ,2 ]
Xu X. [2 ]
Ling Z. [1 ]
Wu Y. [2 ]
Sun L. [2 ]
Fan Y. [2 ]
机构：
[1] School of Mechanical Engineering, Jiangsu University, Zhenjiang
[2] Institute of Advanced Manufacturing and Modern Equipment Technology Engineering, Jiangsu University, Zhenjiang
来源：
Xiyou Jinshu/Chinese Journal of Rare Metals | 2016年 / 40卷 / 09期
关键词：
High-strength aluminum alloy; Mechanical properties; Microstructure; Optimization;
D O I：
10.13373/j.cnki.cjrm.XY15031905
中图分类号：
学科分类号：
摘要：
The effect of solid solution-T6, solid solution-pre-compression-T6, pre-recovery-annealing-solid solution-T6 and pre-recovery-annealing-solid solution-pre-compression-T76 aging treatment on microstructure and mechanical properties of the experimental high strength Al-10.78Zn-2.78Mg-2.59Cu-0.221Zr-0.0465Sr aluminum alloy extrusions were investigated by hardness and electrical conductivity tests, tensile test, optical microscope (OM), X-ray diffraction (XRD) analysis and corrosion experiment. The results showed that under the T6 (120℃×24 h) aging treatment system, pre-recovery-annealing and pre-compression could improve the dislocation strengthening, and pre-recovery-annealing could significantly inhibit recrystallization. Compared with the solid solution-pre-compression-T6, pre-recovery-annealing-solid solution-pre-compression-T6 process could improve the corrosion resistance (the maximum corrosion depth was reduced from 125 to 91 μm, exfoliation corrosion rating increased from EB to EA) without reducing the strength. Under the condition of pre-recovery-annealing-solid solution-pre-compression-T76 aging treatment, the strength of the alloy was as low as 600 MPa, but the electrical conductivity reached as high as 31.58%ICAS, which significantly improved the corrosion resistance compared to T6 aging treatment. Studies showed that the experimental high-strength aluminum alloy extrusion presented the optimal comprehensive performance under the condition of pre-recovery-annealing-solid solution-pre-compression-T6. © Editorial Office of Chinese Journal of Rare Metals. All right reserved.
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页码：864 / 871
页数：7
相关论文
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