Effect of pre-recovery on microstructure and properties of rolled Al-12.18Zn-3.31Mg-1.43Cu-0.20Zr-0.04Sr aluminum alloy

Cheng-bin Cai; Xiao-jing Xu; Jin-dong Huang; Shi-hao Ju; Qing Ding; Cheng-song Wang

doi:10.1007/s12613-019-1729-5

Volume 26 Issue 2

Feb. 2019

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2019 > 26(2): 241-250

Cheng-bin Cai, Xiao-jing Xu, Jin-dong Huang, Shi-hao Ju, Qing Ding, and Cheng-song Wang, Effect of pre-recovery on microstructure and properties of rolled Al-12.18Zn-3.31Mg-1.43Cu-0.20Zr-0.04Sr aluminum alloy, Int. J. Miner. Metall. Mater., 26(2019), No. 2, pp. 241-250. https://doi.org/10.1007/s12613-019-1729-5

Cite this article as:

Cheng-bin Cai, Xiao-jing Xu, Jin-dong Huang, Shi-hao Ju, Qing Ding, and Cheng-song Wang, Effect of pre-recovery on microstructure and properties of rolled Al-12.18Zn-3.31Mg-1.43Cu-0.20Zr-0.04Sr aluminum alloy, Int. J. Miner. Metall. Mater., 26(2019), No. 2, pp. 241-250. https://doi.org/10.1007/s12613-019-1729-5

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Research Article

Effect of pre-recovery on microstructure and properties of rolled Al-12.18Zn-3.31Mg-1.43Cu-0.20Zr-0.04Sr aluminum alloy

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Corresponding author:
Xiao-jing Xu E-mail: xjxu67@126.com
Received: 25 April 2018; Revised: 25 October 2018; Accepted: 30 October 2018

Abstract

Abstract

The independently designed and manufactured ultra-high-strength aluminum alloy Al-12.18Zn-3.31Mg-1.43Cu-0.20Zr-0.04Sr was investigated via scanning electron microscopy observations, X-ray diffraction analysis, hardness tests, electrical conductivity tests, tensile tests, intergranular corrosion tests, and exfoliation corrosion tests. The effect of pre-recovery on the microstructure and mechanical properties of this aluminum alloy was also studied. The results show that the pre-recovery heat treatment releases deformation energy, inhibits recrystallization, and decreases the dislocation density. Although the pre-recovery heat treatment has little effect on the hardness, electrical conductivity, and elongation of this aluminum alloy, it can dramatically improve the alloy's tensile strength (the maximum tensile strength increased from 785.0 MPa to 809.2 MPa). Moreover, the tensile properties of this aluminum alloy have a certain degree of isotropy, and the pre-recovery heat treatment does not affect this property. In addition, the rolled aluminum alloy exhibits good corrosion resistance, but the effect of the pre-recovery heat treatment on the alloy's resistance to intergranular and exfoliation corrosion is negligible.
- ultra-high strength aluminum alloy;
- pre-recovery;
- microstructure;
- mechanical property;
- corrosion resistance

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