Effects of multi-directional forging combined with hot rolling on microstructure and mechanical properties of 7050 aluminum alloy

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Multi-directional forging at 450 °C combined with rolling at 300 °C and 470 °C was applied to a 7050 aluminum alloy prior to heat treatment. The effects of rolling temperature on the microstructure of the alloy were analyzed using optical microscopy, X-ray diffraction, scanning electron microscopy, electron backscatter diffraction and transmission electron microscopy. After solution treatment, the average grain size of the alloy measured from high-angle grain boundaries was approximately 20 μm, compared to 100 μm before forging. After artificial aging, the yield strength, ultimate tensile strength and elongation after fracture of the samples rolled at 300 °C were (609.9±5.5) MPa, (662.4±1.7) MPa and (18.5±1.2)%, respectively. In the case where the alloy was rolled at 470 °C, the corresponding values were (592.7±4.2) MPa, (641.0±3.9) MPa and (18.7±0.9)%, respectively.