Constitutive modeling of flow behavior and processing maps of Mg–8.1 Gd–4.5Y–0.3Zr alloy

Abstract

High temperature deformation behavior and workability of Mg–8.1Gd–4.5Y–0.3Zr alloy were studied by compression tests. Arrhenius equation with strain compensation and processing maps were established. The results show that the activation energy Q, structure factor α, n and ln A varies with the strain, its relationship fit well by fifth order polynomial. The flow stresses predicted by the extracted model are in good agreement with the experimental results. There are five typical domains in the processing map, and the deformation mechanisms in different domains were determined by microstructure analysis. The feasible processing window of the alloy is in the areas of 400–500 °C/0.001–0.1 s−1.

Keywords

• Mg–Gd–Y–Zr alloy
• Workability
• Strain compensation
• Processing map