Effect of re-solution and re-aging on microstructure and properties of 2040 aluminum alloy

被引：0

作者：

Chen J. ^{[1
]}

Luo B. ^{[1
]}

Ling K. ^{[1
]}

Deng P. ^{[1
]}

Shen Z. ^{[1
]}

Bai Z. ^{[1
]}

机构：

[1] School of Materials Science and Engineering, Central South University, Changsha

来源：

Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2023年 / 54卷 / 12期

关键词：

intermetallic particle; precipitation free zone; re-dissolved; re-solution and re-aging; Ω; phase;

D O I：

10.11817/j.issn.1672-7207.2023.12.007

中图分类号：

学科分类号：

摘要：

Under the high temperature environment generated by braking, the performance of 2040 alloy for aircraft wheel hub would gradually decay. In this paper, a heat treatment method of re-solution and re-aging was proposed to restore the performance of the alloy and achieve reusing. Firstly, heat exposure(200 ℃/100 h) was used to simulate the high temperature environment of the wheel hub during braking, so that the alloy failed. Secondly, the alloy without heat exposure treatment was set as a control way. The two groups of alloys were treated by re-solution and re-aging (510 ℃/1.5 h+165 ℃/15 h). Finally, the changes of microstructure and properties of the alloy were investigated by optical microscope(OM), scanning electron microscope(SEM), transmission electron microscope(TEM), electrochemical and inter-granular corrosion test methods. The results show that the re-solution and re-aging treatment increases the grain size, the coarse strengthening phase in the grain disappears, the uniform distribution of Ω phase appears and the number increases, and the mechanical properties of the failed alloy(313 MPa) are restored to the original T6 state(448 MPa). Through re-solution treatment, the intermetallic compound particles(Al2Cu phase and Al2CuMg phase) in the microstructure are partially re-dissolved, which reduces the corrosion sensitive area with solute-poor. The width of the precipitation free zone(PFZ) becomes narrower, reducing the channel of corrosion crack propagation. In summary, after the failure of 2040 alloy for aircraft hub due to heat, the re-solution and re-aging treatment can effectively restore the mechanical properties of the alloy, and also enhance the corrosion resistance. © 2023 Central South University of Technology. All rights reserved.

引用

页码：4673 / 4686

页数：13

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