Abstract
The alloy composition and sensitization behavior are crucial factors that cannot be overlooked in Al–Mg alloys. The effect of Zn addition on mechanical properties and sensitization behavior of 5083 alloy was investigated by tensile tests, weight loss experiments, and first-principles calculation in this paper. The results show that Zn can significantly improve the strength and sensitization behavior of the alloy. The tensile strength of the cold-rolled alloy increased from 459 to 498 MPa with the addition of 1.5%Zn. Furthermore, by incorporating 2.0% Zn, the mass loss of the cold-rolled alloy after sensitization at 170℃/1 h decreased from 49.3 mg·cm−2 to 19.5 mg·cm−2. First-principles calculations indicate that Mg clusters can only exist stably near grain boundaries, while Mg–Zn clusters can exist stably both within and at grain boundaries. This reduces the number of corrosive media at grain boundaries and weakens their continuity. Moreover, the energy barrier that T-phase precipitation needs to overcome during precipitation is lower than β-phase, which transforms the stabilization schedule of the alloy from 240℃/12 h without Zn to that 210℃/4 h with 2.0% Zn-containing. The synergistic effects of Zn content and sensitization on the properties of the alloy were revealed, which sheds some light for the design of the composition and processing method according to application scenarios.
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Acknowledgements
The authors would like to thank the National Key R&D Program (2023YFB3710401 and 2022YFB3504401), the National Natural Science Foundation (52271094 and U1708251), the Key Research and Development Program of Liaoning, China (2020JH2/10700003), and the Science and Technology Plan Program of Qingyuan City (No. 2023YFJH003).
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Zhaoxi Song contributed to the experimental design, data analysis, computational verification, and the writing of the original manuscript; Yajun Xu and Fang Yu contributed to the characterization of the sample and the analysis of experimental results; Wuchen Tian and Chengcheng Chen contributed to the implementation of the experimental process and manuscript review; Xiangjie Wang contributed to the resources, validation, and funding acquisition; Jianzhong Cui contributed to the supervision; and Yizhuo Lu contributed to methodology and revision.
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Song, Z., Wang, X., Xu, Y. et al. Regulation of Zn on mechanical properties and sensitization behavior of 5083 alloy. J Mater Sci 59, 7511–7528 (2024). https://doi.org/10.1007/s10853-024-09635-z
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DOI: https://doi.org/10.1007/s10853-024-09635-z