Microstructure and properties evolution of 6016 aluminum alloy intermediate annealed at different temperatures were analyzed using metallographic microscopy,scanning electron microscopy,X-ray diffraction and mechanical performance testing machines.The results show that under different annealing temperatures,the mechanical properties of the 6016 aluminum alloy do not change much,but hemming factor f and Δr value change significantly.The values of f(0.60)and Δr(0.24)at the intermediate annealing temperature of 360 ℃ are lower than the values of f(0.75)and Δr(0.28)at the intermediate annealing temperature of 410 ℃,indicating that the hemming property at the intermediate annealing temperature of 360℃ is better than that at the intermediate annealing temperature of 410 ℃.As the annealing temperature increases,the surface grain size and grain boundary precipitate Mg2 Si phase size also increase,the maximum size of Mg2 Si phase increases from 1.41 μm to 2.09 μm,and the morphology of most Mg2Si phase change from rounded to elongated.The proportion of Cube texture and R texture at the intermediate annealing temperature of 360℃ is 12.04％and 5.37％,respectively.The proportion of Cube texture and R texture at the intermediate annealing temperature of 410℃ is 14.25％and 3.43％,respectively.Among them,the proportion of R texture at the intermediate annealing temperature of 360℃ is higher,which reduces the Δr value and is conducive to improving the hemming property.The crack propagation of the 6016 aluminum alloy at the intermediate annealing temperature of 410℃ is faster than that at the intermediate annealing temperature of 360 ℃,which is related to the coarse Mg2Si phase on the grain boundaries.
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