Abstract
Abstract The tensile properties and toughness of AA6061-type alloys (nominally Al–1.0% Mg–0.6% Si–0.3% Cu–0.2% Cr) were characterized in terms of the alloy system’s solubility relationships at the solutionizing temperature. The best combination of strength and ductility is achieved in materials with high soluble Mg 2 Si and excess silicon concentrations. Enhanced ductility at a given strength level is associated with high work hardening rates ( n values), whereas toughness is related to intergranular (IG) fracture tendencies. Toughness is therefore negatively impacted by compositional and processing factors that promote IG precipitation: excess silicon, low solutionizing temperatures, slack quench rates and low dispersoid (Cr/Mn) levels.
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