Constitutive modeling of hot deformation behaviors and processing maps of Mg‐4.83Gd‐2.36Nd‐0.21Zr alloy

Abstract

Accurately assessing the hot workability and flow behavior are crucial in the preparation of high‐performance wrought Mg‐RE alloys. The hot deformation behaviors and workability of Mg‐4.83Gd‐2.36Nd‐0.21Zr alloy were examined via Gleeble 3500 thermo‐simulation tests across a range of deformation temperatures from 350 °C to 450 °C and strain rates ranging from 0.001 s‐1 to 1 s‐1. The experimental results revealed that the flow stress of the experimental alloy decreased as the temperature increased and the strain rate decreased. The activation energies for deformation (Q) of the experiment alloy were calculated by the hyperbolic constitutive equation and ranged from 186.78 to 234.97 kJ mol‐1. Strain compensation was incorporated into the constitutive modeling, resulting in the correlation coefficient (R) of 0.9865 and the average absolute relative error (AARE) of 5.4639%. Further, the processing maps were constructed at different strains based on dynamic material models, from which the feasible processing window of the experimental alloy was determined in the areas of deformation temperatures of 425‐450 °C and strain rates of 0.01‐0.1 s‐1.This article is protected by copyright. All rights reserved.