On the influence of rolling path change on static recrystallization behavior of commercial purity aluminum

Abstract

An examination of the influence of rolling path change on the static recrystallization behavior of commercial purity aluminum was performed in the present work. Aluminum strips were cold rolled to a reduction of 50 % under various rolling sequences, i.e. single-pass, double-pass from one direction and with reverse directions, and were then annealed in 290 °C for different durations, while mechanical evaluations such as hardness and tensile tests were used to study the mechanical response of cold deformed and annealed samples. It was indicated that a variation in the recrystallization kinetics of the cold rolled aluminum strips takes place when the rolling path is altered from single to double-pass, and from forward to reverse directions. To express the obtained results and provide a more profound understanding of the flow behavior of rolling samples during deformation processing, combined finite element-dislocation models were taken into account, which were capable of predicting the deformation behavior of the aluminum strips and its consequence on the dislocation structure of the deformed metal. Using the proposed mathematical models, it was found that changing the rolling direction and/or sequence may result in the variation of strain field and dislocation density during cold rolling process, consequently affecting the subsequent restoration phenomena.