Evolution of mechanical properties in a 7075 Al-alloy subject to natural ageing

► Comprehensive mechanical test programme. ► 7075 Aluminium alloy solution heat treated and naturally aged up to 120 min. ► Evolution of anisotropy following the solution heat treatment of 7075-O aluminium. ► Constant r-values and near linear increase in yield strength during natural ageing. ► Proposed semi empirical functions for interpolation of the experimental data set.