Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1574491 | Materials Science and Engineering: A | 2015 | 31 Pages |
Abstract
An Al-2024 alloy was processed by high-pressure torsion (HPT) to produce an ultrafine-grained structure with a grain size of ~240Â nm. A maximum elongation of ~750% was attained with an initial strain rate of 1Ã10â2Â sâ1 at 673Â K, demonstrating the advent of high strain rate superplasticity through grain refinement by the HPT processing. Evaluation of the strain-rate sensitivity and the activation energy for the deformation confirmed that grain boundary sliding through grain boundary diffusion is the rate-controlling process for the superplastic deformation of the HPT-processed Al-2024 alloy.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
Ali Alhamidi, Zenji Horita,