Effects of deformation temperature on microstructure and mechanical properties of multi-directional forged 7050 aluminum alloy
Multi-directional forging tests with different deformation temperatures(390,420,450℃)were carried out on homogenized 7050 aluminum alloy ingots.The effects of deformation temperature on the microstructure and mechanical properties of forged,solution-treated,and aged 7050 aluminum alloy were investigated using optical microscope,scanning electron microscope,electron backscattered diffraction,transmission electron microscope,as well as room temperature tensile tests.The results show that multi-directional forging can reduce the amount of residual crystalline phases,the area fraction of residual phases decreases with the increase of deformation temperature.The core of the alloys basically represents as coarse initial grains,the extent of dynamic recrystallization rises with the increase of deformation temperature after multi-directional forging;the area fraction of residual crystalline phases decreases,and the content of sub-grains increases with the increase of deformation temperature after solid-solution treatment;the amount of nanoscale precipitated phase increases with the increase of deformation temperature after aging treatment.The strength of the aged alloy increases with the increase of the deformation temperature.When the deformation temperature is 450℃,the comprehensive mechanical properties of the alloy are the best.The yield strength is 496.7 MPa,the tensile strength is 555.1 MPa,and the elongation is 8.1%.
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