Dynamic Deformation of Aluminium and Copper as a Thermally Activated Process

摘要

The steady-state flow stress at high strain-rate and at elevated temperatures of commercial purity aluminium and copper was analysed using the theory of the thermally activated deformation of metals. The experimental activation energy for aluminium was determined to be 37.2 Kcal/mole and for copper to be 74 Kcal/mole. The experimental activation energy for aluminium is slightly higher than that observed both for creep and self-diffusion but for copper it is much higher than that observed both for creep and self-diffusion. Discussion for the observed discrepancy is given. (Author)