The Influence of Stored Energy on Grain Boundary Chemistry and Intergranular Corrosion Development in AA2024-T3 Alloy

Xinxin Zhang; Xiaorong Zhou; Guangyi Cai; Yang Yu; Xueqin Lu; Yanbin Jiao; Zehua Dong

doi:10.3390/ma11112299

The Influence of Stored Energy on Grain Boundary Chemistry and Intergranular Corrosion Development in AA2024-T3 Alloy

Materials (Basel). 2018 Nov 16;11(11):2299. doi: 10.3390/ma11112299.

Authors

Xinxin Zhang^{1

2}, Xiaorong Zhou³, Guangyi Cai⁴, Yang Yu⁵, Xueqin Lu⁶, Yanbin Jiao⁷, Zehua Dong⁸

Affiliations

¹ Hubei Key Laboratory of Material Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China. xinxinzhang@hust.edu.cn.
² Corrosion and Protection Centre, School of Materials, The University of Manchester, Manchester M13 9PL, UK. xinxinzhang@hust.edu.cn.
³ Corrosion and Protection Centre, School of Materials, The University of Manchester, Manchester M13 9PL, UK. xiaorongzhou@manchester.ac.uk.
⁴ Hubei Key Laboratory of Material Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China. guangyicai@hust.edu.cn.
⁵ Hubei Key Laboratory of Material Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China. yuyang@hust.edu.cn.
⁶ Hubei Key Laboratory of Material Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China. luxueqin@hust.edu.cn.
⁷ Hubei Key Laboratory of Material Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China. yanbinjiao@hust.edu.cn.
⁸ Hubei Key Laboratory of Material Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China. zhdong@hust.edu.cn.

Abstract

Following our previous research, the correlation between the micro-chemistry of grain boundary and the distribution of stored energy in AA2024-T3 alloy is investigated, using the combination of transmission Kikuchi diffraction and transmission electron microscopy. It is found that the difference of dislocation density, namely stored energy, between two neighboring grains significantly affects the micro-chemistry of the grain boundary. Further, it is revealed that intergranular corrosion development in the AA2024-T3 alloy is mainly attributed to the combined effect of grain boundary chemistry and stored energy distribution.

Keywords: aluminum; electron microscopy; intergranular corrosion.

Abstract

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