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Atomic scale HAADF-STEM study of η′ and η 1 phases in peak-aged Al–Zn–Mg alloys

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Abstract

The microstructures of precipitates in Al–Zn–Mg alloys in peak-aged condition have been studied using scanning transmission electron microscope. The same thermo-mechanical treatment was applied in all alloys. Investigation of peak-aged samples revealed that the most commonly found phases were η′ and η 1 with their respective habit planes on {111}Al and {100}Al. η′ phases under [110]Al were analyzed and compared with η′ structure models. Furthermore, a close inspection of η 1 phase as the second most found precipitate revealed that it incorporates an anti-phase resembling boundary, not observed in other orientation relationships that precipitates create with Al matrix, in addition, differences in matrix-precipitate interfaces between η′/η 2 and η 1 phases were noticed. This paper addresses the first part to the analysis of η′ phase. Next part is extended to the analysis of the η 1 phase.

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Acknowledgements

This work was supported by JST (Japan Science and Technology Agency) under collaborative research based on industrial demand “Heterogeneous Structure Control”: Toward innovative development of metallic structural materials. The authors also acknowledge Dr. Junya Nakamura, Mr. Ryoma Arita and Prof. emeritus Susumu Ikeno, University of Toyama. A part of this research was supported by President description, University of Toyama (2017).

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Authors and Affiliations

  1. Graduate School of Science and Engineering for Education, University of Toyama, Toyama, Japan

    Artenis Bendo

  2. Graduate School of Science and Engineering for Research, University of Toyama, Toyama, Japan

    Kenji Matsuda, Seungwon Lee & Katsuhiko Nishimura

  3. Information Technology Center, University of Toyama, Toyama, Japan

    Norio Nunomura

  4. Department of Mechanical Engineering, Kyushu University, Fukuoka, Japan

    Hiroyuki Toda, Kyosuke Hirayama, Kazuyuki Shimizu & Hongye Gao

  5. Japan Atomic Energy Agency, Tokai, Japan

    Masatake Yamaguchi, Tomohito Tsuru, Kenichi Ebihara & Mitsuhiro Itakura

  6. Aisin Keikinzoku Co., Ltd., Kariya, Japan

    Tomoo Yoshida & Satoshi Murakami

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  1. Artenis Bendo
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Correspondence to Artenis Bendo.

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Bendo, A., Matsuda, K., Lee, S. et al. Atomic scale HAADF-STEM study of η′ and η 1 phases in peak-aged Al–Zn–Mg alloys. J Mater Sci 53, 4598–4611 (2018). https://doi.org/10.1007/s10853-017-1873-0

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  • DOI: https://doi.org/10.1007/s10853-017-1873-0

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