Cu atoms suppress misfit dislocations at the β″/Al interface in Al–Mg–Si alloys

[Display omitted] The Cu interactions with the Al–Mg–Si alloy main hardening phase β″ are investigated in atomic scale, by using experimental and simulated high angle annular dark-field scanning transmission electron microscopy techniques and density functional theory calculations. Cu is located at...

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Bibliographic Details
Published in:Scripta materialia 2016-01, Vol.110, p.6-9
Main Authors: Saito, Takeshi, Ehlers, Flemming J.H., Lefebvre, Williams, Hernandez-Maldonado, David, Bjørge, Ruben, Marioara, Calin D., Andersen, Sigmund J., Mørtsell, Eva A., Holmestad, Randi
Format: Article
Language:English
Subjects:
Aluminium alloys
Atomic structure
Condensed Matter
Density functional theory
High angle annular dark-field scanning transmission electron microscopy
Physics
Precipitate
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Summary:[Display omitted] The Cu interactions with the Al–Mg–Si alloy main hardening phase β″ are investigated in atomic scale, by using experimental and simulated high angle annular dark-field scanning transmission electron microscopy techniques and density functional theory calculations. Cu is located at or near the β″/Al interface, with the misfit dislocations normally observed for a precipitate of this size being absent. It is proposed that the small Cu volume is crucial to this mechanism. Present supercell based calculations cannot fully model these interactions.
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2015.07.033