The hot rolling deformation performance of as-cast AZ80 magnesium alloy after ultrasonic processing

Aiming at the poor formability of Mg alloys, this work investigated the hot rolling deformation performance and behavior of as-cast AZ80 alloy with ultrasonic processing (UP) using both experiment and finite element method (FEM) simulation. The results reflect that UP refined grains from 876 mm to 215 mm and eliminated the dendrites. The as-rolled sheet without UP had many intersectant shear bands with the appearance of micro-cracks but less DRX than the sheet with UP. The as-rolled sheet with UP had weakened basal texture with the intensity decrease from 14.14 (sheet without UP) to 6.86, and less content of contraction twins and double twins. Many cracks appeared on the surface of the as-rolled sheet without UP at both rolling temperatures of 573 K and 673 K. By contrast, the sheet with UP had a few small edge-cracks at 573 K and no cracks at 673 K. The FEM simulation revealed that as-cast AZ80 with UP required less effective stress and had less damage value during the rolling process than the sheet with UP. The UP presents the ability to refine the as-cast grains and to improve the formability of AZ80 in the subsequent deformation process. (c) 2022 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

Automated summary

This study investigated the effect of ultrasonic processing (UP) on the hot rolling deformation performance of as-cast AZ80 alloy through experiments and simulations. The results show that UP can refine grains, eliminate dendrites, and improve the basal texture, contraction twin, and double twin content. The sheet without UP is prone to cracking during rolling, while the sheet with UP has fewer cracks. The simulation results indicate that the as-cast AZ80 with UP requires lower stress and has lower damage value during the rolling process.