Cyclic Bending Behaviors of Extruded AZ31 Magnesium Alloy Beams

Bending behavior holds significant importance, as it plays an unavoidable role in a variety of forming processes. Therefore, gaining insight into the cyclic bending mechanical behavior of magnesium (Mg) alloys is crucial for designing, fabricating, and ensuring the performance of end products. This study conducts cyclic bending simulations of an extruded AZ31 Mg alloy beam using crystal-plasticity-based methods. The study encompasses the macroscopic aspects of stress distribution and strain distribution, along with a detailed discussion of microscopic factors such as the relative activities of deformation mechanisms and twin volume fraction during cyclic bending. Different from conventional alloys with high crystal symmetry, the apparent the neutral layer shifting phenomena is observed in the extruded AZ31. The simulated results reveal that this distinct behavior is ascribed to the alternating twinning and detwinning mechanisms.