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For Mg-excess Al–Mg–Si alloys, when aged at 180°C, the alloys are hardened mostly by the monoclinic β″-phase precipitates, whereas when aged at 250°C, the alloys are hardened mainly by the hexagonal β′-phase precipitates. Here we show that applying natural aging prior to artificial aging can gradually modify and eventually reverse the precipitation pathways, such that the β′-precipitates become dominating...
Multiple precipitating nanotwins of {111}/[112] type have been observed forming on the eutectic Si particles in Al–Si alloys upon annealing. High-resolution transmission electron microscopy (HRTEM) reveals that these precipitating nanotwins may possess very rich microstructures, including 5-fold nanotwins and various twin junctions. The formed Si nanotwins are very thin objects that are naturally...
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