PLANE STRAIN FORGING OF ALUMINUM AND AN ALUMINUM ALLOY AT LOW STRAIN RATES AND ELEVATED TEMPERATURES

The production of stress-strain data at low strain rates and elevated temperatures for pure aluminum and an aluminum-copper alloy, using a constant-velocity, planestrain compression test, is described. The shapes of the stress-strain curves are interpreted in terms of the competing tendencies towards work hardening and thermal softening. It is shown that the stress required to produce a given deformation is related to the strain rate through a power law. It is found that data can be correlated in terms of equivalent temperature and strain-rate combinations through the Zener-Hollomon parameter and a velocity modified temperature. However, in the case of the aluminum alloy the correlation is poor. Comparison of the present work with previous work revealed some differences in experimental results. © 1969.