A physically-based constitutive model for high temperature deformation of Cu-0.36Cr-0.03Zr alloy

Hot deformation behavior of Cu-0.36Cr-0.03Zr alloy is investigated by hot compression tests in a wide range of temperatures (800, 900, 950 degrees C) and strain rates (0.001, 0.01, 0.1, 1, 10, 20 s(-1)). For eliminating friction effects during tests and adiabatic effects at high strain rates, true stress-strain curves are friction corrected and then temperature corrected to elucidate real hot deformation behavior. True stress-strain curves after correction exhibit typical characteristics of dynamic recovery and dynamic recrystallization. The deformation activation energy of this alloy under this test condition is calculated as 432.6 KJ/Mol. Based on the stressedislocation relation and kinetics of dynamic recrystallization, a physically-based constitutive model is developed. The predicted stresses agree well with experimental ones with the correlation coefficient (R) of 0.9982 and the average absolute relative error (AARE) of 3.47%. (C) 2015 Elsevier B.V. All rights reserved.