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Effect of Overaging on Fatigue Crack Propagation and Stress Corrosion Cracking Behaviors of an Al-Zn-Mg-Cu Alloy Thick Plate

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Abstract

The fatigue property as well as stress corrosion cracking (SCC) resistance of an Al-Zn-Mg-Cu alloy thick plate in peak-aged and overaged tempers (T7351 and T7651) is systematically investigated by fatigue crack propagation (FCP) test and slow strain rate test (SSRT). Microstructural characterization is examined by transmission electron microscopy and scanning electron microscopy. Results reveal that the T7351 alloy has lower strength but higher electrical conductivity as compared to T7651 alloy. The FCP resistance of T7351 alloy is superior to that of the T7651 alloy due to the coarser precipitates in the highly overaged alloy in which the strain localization is reduced by promoting homogeneous slip. In addition, the SSRT test suggests a higher SCC resistance in T7351 alloy. The enhanced SCC resistance is found to depend on grain boundary precipitate characteristics and crack propagation resistance of the alloys.

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Acknowledgments

This research is financially supported by the National Key Research and Development Program of China (No. 2016YFB0300900) and the Natural Science Foundation of China (No. 51171209).

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Authors and Affiliations

  1. School of Material Science and Engineering, Central South University, Changsha, 410083, People’s Republic of China

    Lianghua Lin, Zhiyi Liu, Xiangnan Han & Wenjuan Liu

  2. School of Mechanical and Electronic Engineering, East China University of Technology, Nanchang, 330013, Jiangxi, China

    Lianghua Lin

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Correspondence to Zhiyi Liu.

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Lin, L., Liu, Z., Han, X. et al. Effect of Overaging on Fatigue Crack Propagation and Stress Corrosion Cracking Behaviors of an Al-Zn-Mg-Cu Alloy Thick Plate. J. of Materi Eng and Perform 27, 3824–3830 (2018). https://doi.org/10.1007/s11665-018-3518-0

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  • DOI: https://doi.org/10.1007/s11665-018-3518-0

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