Cu atoms suppress misfit dislocations at the β″/Al interface in Al–Mg–Si alloys. (1st January 2016)

• Record Type: Journal Article
• 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
• Is Part Of: Scripta materialia. Volume 110(2016)
• Page Start: 6
• Page End: 9
• Publication Date: 2016-01-01
• Subjects: Aluminium alloys -- Precipitate -- High angle annular dark-field scanning transmission electron microscopy -- Density functional theory -- Atomic structure; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2015.07.033
• Languages: English
• ISSNs: 1359-6462

Abstract

Graphical abstract: 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.