Macro-micro Simulation of AZ31 Magnesium Alloy Under High Strain Rate Rolling

Macroscopical finite element model and microcosmic dynamic recrystallization model were established to simulate high strain rate rolling of AZ31 magnesium alloy over the temperature ranges 300 ℃ to 400 ℃ with average strain rates of 10-29 s-1. The results according to the comparison between simulated results and experimental results show that with increasing the average strain rate, both the equivalent stress diffe-rence of the simulated rolled plate along the width direction and the macro crack length decrease. The greater the difference in the equivalent stress, the longer the crack length. The results of macro simulation agree well with the experimental results. Dynamic recrystallization of AZ31 magnesium alloy during high strain rate rolling was simulated using micro-dynamic recrystallization model and macro-finite element history loa-ding coupled cellular automata (CA). With strain rate increasing, recrystallization is gradually completely, followed by dissipation of stress concentration, finally causing the decrease of crack length. The high strain rate rolling process of AZ31 magnesium alloy can be accurately simulated by establishing a multi-scale macro and micro simulation model. This work provides a new idea for accurate control of high strain rate rolling of magnesium alloy. © 2021, Materials Review Magazine. All right reserved.