Abstract
Transient creep of pure and commercial Al was studied under a constant stress of 18.6 MPa at different temperatures ranging from 613-698 deg K. The anomalous values of transient creep parameters beta , n ranging from 0.003-0.055 ( plus/minus 0.001) and 0.5-1.0 ( plus/minus 0.05) respectively, which were found in this temperature range, might be ascribed to the superplastic behavior of pure and commercial Al. The activation energy of transient creep for pure Al was found to be approx (2.4 plus/minus 0.07) x 10 -- 22 kJ/atom, characterizing a dislocation glide -- cross-slipping mechanism.--AA.