8011 cold-rolled sheets with a deformation of 78% were annealed at different temperatures.The effect of annealing temperature on the microstructure and mechanical properties of cold-rolled sheets were analyzed using metallographic microscope,SEM,microhardness testing machine and tensile testing.The results show that with the increase of annealing temperature,the degree of recrystallization increased,the distribution of particle size and precipitated phase were more and more uniform,the elongation of 8011 cold-rolled sheets increased gradually while the hardness,tensile strength and yield stress decreased constantly.When annealing at 350°C,the microstructure of 8011 cold-rolled sheets was fine and homogeneous equiaxed grain structure,and the anisotropy index was the lowest.The optimum annealing temperature of 8011 cold-rolled sheets was about 350°C.
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