Hot Deformation Behavior and Constitutive Model of AZ80–0.8wt%Y Considering the Compensation of Strain

Abstract

To evaluate the hot flow behavior of homogenized AZ80 magnesium alloy containing 0.8 wt% yttrium, isothermal hot compression tests are conducted among the different temperature ranges of 340–420 °C under the strain rates of 10−2–101 s−1 by using a Gleeble‐3800 thermo‐simulator. The flow stress variation of high temperature and strain rate on the microstructure is analyzed. In the constitutive equation for the AZ80‐0.8wt%Y, it is conducive to obtain the deformation activation energy and the change law of strain of the material constant through the relationship between peak stress, deformation temperature, and strain rate. The deformation activation energy is found to be about 119.03 kJ mol−1. Subsequently, the values of the correlation coefficient (R) and the average absolute relative error (AARE) are 0.9826 and 7.29%, respectively. Consequently, the results indicate that the strain‐dependent constitutive equation has a good agreement with the calculated and measured flow stresses in the elevated temperature range for the AZ80–0.8wt%Y.

Constitutive Modeling of Hot Deformation Behaviors and Processing Maps of Mg–4.83Gd–2.36Nd–0.21Zr Alloy

“…As is known, the constitutive model and processing map have been extensively used to study the flow behavior and optimal forming windows. [27][28][29][30][31] In previous studies, we developed cast Mg-4.83Gd-2.36Nd-0.21Zr alloy, which exhibited satisfactory mechanical properties. The tensile yield strength, ultimate tensile strength, and tensile elongation to failure were 105 MPa, 190 MPa, and 16.4%, respectively.…”

“…As is known, the constitutive model and processing map have been extensively used to study the flow behavior and optimal forming windows. [ 27–31 ]…”