Effect of Rolling Deformation on Microstructure and Properties of 7085 Aluminum Alloy

The most economical and effective way to obtain plate by plastic deformation is rolling and rolled plate has been widely used in aircraft skin, car door panel, ship deck, tank armor plate and wireless transmission base station panel. However, the high-strength 7-series alloy has high deformation resistance, which leads to difficult plastic forming meanwhile rolling deformation changes the precipitation behavior of the alloy. Therefore, the effect mechanism of rolling deformation amount (80, 90%) on the microstructure evolution of 7085 aluminum alloy was studied in this work. The results show that the average size of aging precipitates decreases from 3.66 to 2.79 nm, and the width of PFZ (no precipitate free zone) decreases from 22.6 to 19.5 nm when the rolling deformation amount increases from 80 to 90%. The main reason is that the increase of rolling deformation amount leads to the increase of inside dislocation density, which provides nucleation point and dislocation channel, thus refining the precipitation phase and reducing the width of PFZ.