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Study of the Q′ (Q)-phase precipitation in Al–Mg–Si–Cu alloys by quantification of atomic-resolution transmission electron microscopy images and atom probe tomography

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Ding, Lipeng [UCL] Orekhov, Andrey [University of Antwerp] Weng, Yaoyao [Chongqing University] Jia, Zhihong [Chongqing University] Idrissi, Hosni [UCL] Liu, Qing [Chongqing University]

The precipitation mechanism of the Q phase in Al-Mg-Si-Cu alloys has long been the subject of ambiguity and debate since its metastable phase (Q′) has the same crystal structure and similar lattice parameters as its equilibrium counterparts. In the present work, the evolution of the Q′ (Q) phase during aging is studied by combination of quantitative atomic resolution scanning transmission electron microscopy and atom probe tomography (APT). It was found that the transformation from the Q′ to the Q phase involves changes of the occupancy of Al atoms in atomic columns of the Q′ (Q) phase. The Al atoms incorporated in the Cu, Si and Mg columns are gradually released into the Al matrix, while mixing between Cu and Si atoms occurs in the Si columns. This transformation process is mainly attributed to the low lattice misfit of the equilibrium Q phase. Besides, the formation of various compositions of the Q phase is due to the different occupancy in the atomic columns of the Q phase. The occupancy changes in the columns of the Q phase are kinetically controlled and are strongly influenced by the alloy composition and aging temperature.

Type de document Article de périodique (Journal article) – Article de recherche
Type d'accès Accès libre
Année de publication 2019
Langue Anglais
Information sur le périodique "Journal of Materials Science" - (2019)
Peer reviewed oui
Editeur Springer Nature
issn 0022-2461
e-issn 1573-4803
Statut de la publication Publié
Affiliations UCL - SST/IMMC/IMAP - Materials and process engineering
Chongqing University - International Joint Laboratory for Light Alloys
University of Antwerp - Electron Microscopy for Materials Science (EMAT)
Chongqing University - Electron Microscopy Center
Tokyo Institute of Technology - Department of Metallurgy and Ceramics Science
Mots-clés Aluminum alloys ; Precipitation ; High angle annular dark-field scanning ; Atom probe tomography
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Référence bibliographique Ding, Lipeng ; Orekhov, Andrey ; Weng, Yaoyao ; Jia, Zhihong ; Idrissi, Hosni ; et. al. Study of the Q′ (Q)-phase precipitation in Al–Mg–Si–Cu alloys by quantification of atomic-resolution transmission electron microscopy images and atom probe tomography. In: Journal of Materials Science, (2019)
Permalien http://hdl.handle.net/2078.1/213762