Five-fold symmetry structure inhibiting the growth of an otherwise perfect η2 phase in Al-Zn-Mg-Cu alloys

Using high angle annular dark-field scanning transmission electron microscopy, we report the formation of a five-fold symmetry structure at the (1¯100)η//(110)Al edge interface of otherwise defect-free η2 precipitates in Al-Zn-Mg-Cu alloys. This quasicrystal entity has a demonstrated ability to hind...

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Bibliographic Details
Published in:Scripta materialia 2023-11, Vol.236, p.115664, Article 115664
Main Authors: Xiang, Kaiyun, Ehlers, Flemming.J.H., Lei, Xiuchuan, Yang, Xiaofang, Ding, Lipeng, Wang, Chenglin, Liu, Qing, Jia, Zhihong
Format: Article
Language:English
Subjects:
Al-Zn-Mg-Cu alloy
Density functional theory (DFT)
High angle annular dark-field scanning transmission electron microscopy (HAADF-STEM)
Precipitates
Quasicrystal
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Summary:Using high angle annular dark-field scanning transmission electron microscopy, we report the formation of a five-fold symmetry structure at the (1¯100)η//(110)Al edge interface of otherwise defect-free η2 precipitates in Al-Zn-Mg-Cu alloys. This quasicrystal entity has a demonstrated ability to hinder growth at the interface where it resides. Assisted by calculations based on density functional theory, the five-fold symmetry structure is shown to form easily at Zn-rich conditions due to favorable interfacial energies at all stages of evolution. These findings offer an enhanced perspective of precipitate stabilization in an alloy of widespread industrial interest, presenting a potential alternative path to alloy design. [Display omitted]
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2023.115664