Cu atoms suppress misfit dislocations at the β″/Al interface in Al-Mg-Si alloys
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OriginalversjonScripta Materialia. 2016, 110 6-9. 10.1016/j.scriptamat.2015.07.033
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.