A Study on Extrusion Deformation Behavior of ZAM631 Magnesium Alloy Using the Rigid Plastic Finite Element Method

A uniaxial hot compression test was carried out under a strain rate range of 10(-3)similar to 1/s at a temperature range of 533 similar to 653K to evaluate the flow stress features of ZAM631 Magnesium (Mg) alloy. The peak value of flow stress increased with increasing strain rate at constant temperature. In contrast, an increase in the deformation temperature at a constant strain rate resulted in a decrease of the peak value of the flow stress. Microstructure examination of the specimens showed that dynamic recrystallization (DRX) took place in both compressed and extruded specimens. The flow stress information was further used to simulate the indirect extrusion process for the ZAM631 alloy. Non-isothermal finite element simulations were carried out by a rigid plastic finite element method. Extrusion deformation behaviors such as temperature, strain rate and strain were compared at different locations of the deformed billet during extrusion.