The room temperature mechanical properties of hot rolled 7075 aluminum alloy

The effect of equivalent rolling strain and temperature on the microstructural evolution and mechanical properties of 7075-T7351 aluminum alloy has been studied. This has been carried out using tensile testing method. The results indicated that the predominant restoration process during rolling at 250 and 350 °C is dynamic recovery, and the driving force is not high enough to trigger the dynamic recrystallization. However, the recrystallized grains are clearly evident in the microstructure of the specimens which were rolled at 450 °C. The tensile test results showed that the room temperature strength and ductility were decreased by increasing rolling temperature in the temperature range of 250–350 °C. The room temperature mechanical properties of the alloy were started to improve by increasing the temperature up to 450 °C. The observed trends were explained through considering the microstructural evolution upon hot rolling.

► The predominant restoration process during rolling at 250 and 350 °C is dynamic recovery.
► The recrystallized grains are evident in the microstructure of the specimens rolled at 450 °C.
► Occurrence of dynamic precipitation during rolling at 350 °C.
► A drop in strength and ductility was realized in the specimens that were rolled at 350 °C.
► The room temperature mechanical properties were improved by increasing the temperature to 450 °C.