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

摘要

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-l.Icr alloy was investigated by isothermal compression on Gleeble-1500 hot simulator in the temperature range of 400-800°C and strain rate of 0.01-ls-1. The experimental results indicated that the flow stress of Cu-l.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-l.lCr alloy during hot compression deformation could be represented by Zener-Hollomon parameter including the Arrhenius term. The values of n, a and A in the analytical expressions of flow stress are fitted to be n=15.696, α=0.005178MPa-1and A =1.289×1021s-1, respectively. The hot deformation activation energy is 346.738kJ/mol. The constitutive equation of the Cu-1.1 Cr alloy was obtainedε = 1.289 ×1021 [sinh(0.005178σ)]1/15.696 exp(-346738/ RT).