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Effect of Grain Boundary and Crystallographic Orientation on the Stress Corrosion Behavior of an Al-Zn-Mg Alloy

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Abstract

The effect of grain boundary and crystallographic orientation on the stress corrosion behavior of an Al-4.5Zn-1.4Mg alloy was investigated by comparing the performance of constant load stress corrosion test (CLSCT) and tensile test of specimens parallel to the longitudinal and transverse directions of the extruded plate. The results revealed that the strength of the longitudinal and transverse specimens decreased by 9.68 and 18.13%, respectively, after 10-day CLSCT. The transverse specimens show poor resistance to stress corrosion cracking (SCC). The grain boundaries (GB) of the longitudinal section are less dense, and more of them are distributed along the extrusion direction compared with the cross section with selected areas of the same size. The SCC of all specimens starts from the side faces of the specimen, and it is dominated by intergranular cracking. But the corrosion of the transverse specimens was more serious. The cracks of all specimens tend to propagate along the GBs with misorientation of about 50°-60°, and the difference of Schmidt factor (SF) values of grains on both sides of the crack is significantly large. The crack of longitudinal specimens propagates relatively parallel to the tensile direction, while propagation of the crack in transverse specimens is more zigzag.

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Acknowledgments

This present work was supported by National Natural Science Foundation (Project No. 51474240) and Provincial Science and Technology Major Project of Hunan province (Project No. 2016KG1004), which are greatly acknowledged by the authors.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Central South University, Changsha, 410083, China

    Jianguo Tang, Yidan Zhang, Lingying Ye, Meng Qu, Jianshan Wu, Zhen Zhang, Shengdan Liu & Yunlai Deng

  2. Research Institute of Light Alloy, Central South University, Changsha, 410083, China

    Jianguo Tang & Yunlai Deng

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  1. Jianguo Tang
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Tang, J., Zhang, Y., Ye, L. et al. Effect of Grain Boundary and Crystallographic Orientation on the Stress Corrosion Behavior of an Al-Zn-Mg Alloy. J. of Materi Eng and Perform 28, 2954–2966 (2019). https://doi.org/10.1007/s11665-019-04050-x

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  • DOI: https://doi.org/10.1007/s11665-019-04050-x

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