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Journal of Materials Engineering and Performance

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21-04-2023 | Technical Article

Effect of Ce and Y on Microstructures and Properties of Al-11.0Zn-3.1Mg-1.22Cu-0.1Sr-0.2Zr-0.1Ti Alloy

Authors: Xiaojing Xu, Tian Han, Qingshan Zhou, Tao Wei, Guoning Bao, Hui Yao, Mengnan Han, Shaohui Sha

Published in: Journal of Materials Engineering and Performance | Issue 7/2024

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Abstract

The effects of rare earth elements (Ce and Y) additions with the same content (0.3 wt.%, mass fraction) on microstructure evolution and mechanical properties of the Al-11.0Zn-3.1Mg-1.22Cu-0.1Sr-0.2Zr-0.1Ti alloy (base alloy) were investigated. The addition of Ce and Y refined the grain size and led to aging precipitates, which were dominated by the fine and compactly distributed GP (Guinier Preston) zones and the formed η′ (MgZn₂) phase, improving the tensile properties of the alloy. The Ce-containing alloy possessed the highest tensile strength and elongation of 768.5 MPa and 8.0%, respectively. Meanwhile, the large atomic radius and low electronegativity of Ce and Y led to the discontinuous distribution of grain boundary precipitates (GBPs) and the broadening of the precipitate-free zones (PFZs) in the alloys, resulting in the improvement of intergranular corrosion resistance (IGC) of the rare earth modified alloys compared with the base alloy, with the best results for the Y-containing alloys.

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Title: Effect of Ce and Y on Microstructures and Properties of Al-11.0Zn-3.1Mg-1.22Cu-0.1Sr-0.2Zr-0.1Ti Alloy
Authors: Xiaojing Xu
Tian Han
Qingshan Zhou
Tao Wei
Guoning Bao
Hui Yao
Mengnan Han
Shaohui Sha
Publication date: 21-04-2023
Publisher: Springer US
Published in: Journal of Materials Engineering and Performance / Issue 7/2024
Print ISSN: 1059-9495
Electronic ISSN: 1544-1024
DOI: https://doi.org/10.1007/s11665-023-08209-5

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