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Volume 14
Issue 19
10.3390/ma14195516
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Article

Effect of Sc and Zr Additions on Recrystallization Behavior and Intergranular Corrosion Resistance of Al-Zn-Mg-Cu Alloys

by
Peng Xia
1,2,
Shuncheng Wang
3,*,
Huilan Huang
1,2,
Nan Zhou
1,2,
Dongfu Song
1,2 and
Yiwang Jia
1,2
1
Institute of New Materials, Guangdong Academy of Sciences, Guangzhou 510650, China
2
Guangdong Provincial Key Laboratory of Metal Toughening Technology and Application, Institute of New Materials, Guangdong Academy of Sciences, Guangzhou 510650, China
3
Guangdong Xingfa Aluminum Company Limited, Foshan 528137, China
*
Author to whom correspondence should be addressed.
Materials 2021, 14(19), 5516; https://doi.org/10.3390/ma14195516
Submission received: 30 August 2021 / Revised: 18 September 2021 / Accepted: 20 September 2021 / Published: 23 September 2021
(This article belongs to the Topic Metallurgical and Materials Engineering)
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Abstract

The recrystallization and intergranular corrosion behaviors impacted by the additions of Sc and Zr in Al-Zn-Mg-Cu alloys are investigated. The stronger effect of coherent Al3(Sc1−xZrx) phases on pinning dislocation resulted in a lower degree of recrystallization in Al-Zn-Mg-Cu-Sc-Zr alloy, while the subgrain boundaries can escape from the pinning of Al3Zr phases and merge with each other, bringing about a higher degree of recrystallization in Al-Zn-Mg-Cu-Zr alloy. A low degree of recrystallization promotes the precipitation of grain boundary precipitates (GBPs) with a discontinuous distribution, contributing to the high corrosion resistance of Al-Zn-Mg-Cu-Sc-Zr alloy in the central layer. The primary Al3(Sc1−xZrx) phase promotes recrystallization due to particle-stimulated nucleation (PSN), and acts as the cathode to stimulate an accelerated electrochemical process between the primary Al3(Sc1−xZrx) particles and GBPs, resulting in a sharp decrease of the corrosion resistance in the surface layer of Al-Zn-Mg-Cu-Sc-Zr alloy.
Keywords: Al-Zn-Mg-Cu alloy; recrystallization; intergranular corrosion; scandium Al-Zn-Mg-Cu alloy; recrystallization; intergranular corrosion; scandium

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MDPI and ACS Style

Xia, P.; Wang, S.; Huang, H.; Zhou, N.; Song, D.; Jia, Y. Effect of Sc and Zr Additions on Recrystallization Behavior and Intergranular Corrosion Resistance of Al-Zn-Mg-Cu Alloys. Materials 2021, 14, 5516. https://doi.org/10.3390/ma14195516

AMA Style

Xia P, Wang S, Huang H, Zhou N, Song D, Jia Y. Effect of Sc and Zr Additions on Recrystallization Behavior and Intergranular Corrosion Resistance of Al-Zn-Mg-Cu Alloys. Materials. 2021; 14(19):5516. https://doi.org/10.3390/ma14195516

Chicago/Turabian Style

Xia, Peng, Shuncheng Wang, Huilan Huang, Nan Zhou, Dongfu Song, and Yiwang Jia. 2021. "Effect of Sc and Zr Additions on Recrystallization Behavior and Intergranular Corrosion Resistance of Al-Zn-Mg-Cu Alloys" Materials 14, no. 19: 5516. https://doi.org/10.3390/ma14195516

APA Style

Xia, P., Wang, S., Huang, H., Zhou, N., Song, D., & Jia, Y. (2021). Effect of Sc and Zr Additions on Recrystallization Behavior and Intergranular Corrosion Resistance of Al-Zn-Mg-Cu Alloys. Materials, 14(19), 5516. https://doi.org/10.3390/ma14195516

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