Abstract
1. The maximum strength of alloys of the system Al−Zn−Mg (Zn:Mg=1.7) is achieved after quenching and artificial aging; the aging effect for ultimate breaking strength of quenched alloys is Δσf=42-160 N/mm2. 2. Microplastic deformation in Al−Zn−Mg alloys proceeds unevenly. In specimens after artificial aging or after quenching and artificial aging intercrystalline crack propagation is observed. Specimen failure in the quenched condition is mixed in nature. Alloys are not inclined towards overall or intercrystalline corrosion.
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