Abstract
In this study, Al–Zn–Mg–Sc alloys with different microstructures were fabricated by friction stir processing (FSP) and different post-heat treatments. The structure with fine equiaxed grains and a high density of η phases were obtained in the alloys after FSP. Post solid-solution treatment (ST) and artificial aging (AA) led to the η phases dissolute and η′ phases precipitate in the FSP Al–Zn–Mg–Sc alloys, respectively. The fine grain structure in the high rotation rate FSP alloy can be well retained during heat treatment owing to the grain boundary (GB) pinning effect of nanosized Al3(Sc,Zr) phases. However, the pining force caused by the Al3(Sc,Zr) phases did not inhibit the coarsening of the grains in the low rotation rate FSP sample during ST. After AA alone or AA and subsequent ST, the FSP Al–Zn–Mg–Sc alloys exhibited good strength, high ductility, and well corrosion resistance owing to the high densities of their η′ phases and fine grains.
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