Flow Stress Constitutive Equation of Age Hardening Cu-1.1Cr Alloy during Hot Compression Deformation

The Cu-1.1Cr alloys performed in this paper were prepared by thermal deformation + solution treatment + cold deformation + aging treatment + machining. The flow stress behavior of Cu-1.1Cr alloy was investigated by isothermal compression on Gleeble-1500 hot simulator in the temperature range of 400-800 degrees C and strain rate of 0.01-1s(-1). The experimental results indicated that the flow stress of Cu-1.1Cr alloy depends on the strain rate and the deformation temperature. The flow stress increased with increasing strain rates and decreased with increasing temperature. The flow stress of Cu-1.1Cr alloy during hot compression deformation could be represented by Zener-Hollomon parameter including the Arrhenius term. The values of n, alpha and A in the analytical expressions of flow stress are fitted to be n=15.696, alpha=0.005178MPa(-1) and A =1.289x10(21) S(-1), respectively. The hot deformation activation energy is 346.738kJ/mol. The constitutive equation of the Cu-1.1Cr alloy was obtained (epsilon) over dot = 1.289 x 10(21) [sinh(0.005178 sigma)](1/15.696) exp(-346738/RT).