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Both Mn and Ag were added to the Al–Zn–Mg alloy in order to improve both strength and ductility by controlling the grain size and the precipitate microstructure with precipitate-free zones (PFZs). Although adding Mn significantly refined the grains in the Al–Zn–Mg alloy, it decreased the age-hardenability. Adding a combination of Mn and Ag to the Al–Zn–Mg alloy, on the other hand, improved both grain...