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Microstructure characterization in a sensitized Al–Mg–Mn–Zn alloy

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Abstract

Alloying elements, present in the aluminum solid solution or the precipitates, influence the corrosion resistance of Al–Mg–Mn–Zn alloys. In this study, sensitizing treatment was applied to an Al–Mg–Mn–Zn alloy to modify the precipitation at the grain boundaries or in the grains. Transmission electron microscopy (TEM) and scanning electron microscope (SEM) were used to characterize various second-phase particles and determine their orientation relationship with the Al matrix. After sensitizing treatment, τ-phase (Mg32(Al, Zn)49) is observed to precipitate along the grain boundaries in a coarser size, producing a discontinuous grain boundary precipitate structure. In addition, Mn-rich particles are found to form with various shapes, such as global, plate and rhombus.

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Acknowledgments

This work was financially supported by the National Natural Science Foundation of China (No. 51301017) and the Common Construction Project from Beijing Municipal Commission of Education.

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Authors and Affiliations

  1. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing, 100083, China

    Chun-Yan Meng, Di Zhang, Lin-Zhong Zhuang & Ji-Shan Zhang

  2. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Ping-Ping Liu

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  1. Chun-Yan Meng
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  2. Di Zhang
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  4. Lin-Zhong Zhuang
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  5. Ji-Shan Zhang
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Correspondence to Di Zhang.

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Meng, CY., Zhang, D., Liu, PP. et al. Microstructure characterization in a sensitized Al–Mg–Mn–Zn alloy. Rare Met. 37, 129–135 (2018). https://doi.org/10.1007/s12598-015-0665-4

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  • DOI: https://doi.org/10.1007/s12598-015-0665-4

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