Simulation of dynamic recrystallization behavior of hot extruded Mg-Zn-Y-Nd alloy tubes by the finite element method

Abstract

The biodegradability and biocompatibility of magnesium alloys make them potential materials for manufacturing cardiovascular stents after multipass deformation and processing. The fabrication of Mg tubes is the most important step of the production procedure. In this work, the constitutive equation of this alloy was established by isothermal hot compression testing. A series of relevant models of dynamic recrystallization kinetics and grain growth processes were also established. Based on these models, a simulation utilizing the finite element method was employed to investigate the flow behaviors of a Mg-Zn-Y-Nd alloy during hot extrusion. The simulation results of the effective strain and grain size of the processed alloy show agreement with the experiments. Finally, a universal workflow is presented that facilitates the optimization of the manufacturing process of Mg tubes by the finite element method.