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

Saito, Takeshi; Ehlers, Flemming J H; Lefebvre, Williams; Hernandez-Maldonado, David; Bjørge, Ruben; Marioara, Calin Daniel; Andersen, Sigmund Jarle; Mørtsell, Eva Anne; Holmestad, Randi
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URI
http://hdl.handle.net/11250/2464284
Date
2016
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Original version
Scripta Materialia. 2016, 110 6-9.   10.1016/j.scriptamat.2015.07.033
Abstract
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.
Publisher
Elsevier
Journal
Scripta Materialia

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