Athermal strength of pure aluminum is significantly decreased by severe plastic deformation and it is markedly augmented by subsequent annealing.

ABSTRACT: Over the last two decades, it has been considered that fine crystal grains produced by severe plastic deformation (SPD) lead to an extraordinarily high metal strength. The present study reveals that this understanding is basically incorrect. In our uniaxial tensile tests on industrial pure aluminum at an ultralow strain rate of [Formula: see text], we observed that SPD accompanied by grain refining significantly softened the material. The fundamental strength effective for real structures and structural materials should mean an eternal capability to bear stresses caused by external forces, which is independent of time, that is, athermal. We tried to extract quantitatively the athermal (time-independent) strength from the total strength measured in uniaxial tensile tests under the assumptio

SUBMITTER: Koizumi T 

PROVIDER: S-EPMC7445292 | biostudies-literature | 2020 Aug

REPOSITORIES: biostudies-literature