TY - JOUR
T1 - Grain refinement and high strain rate superplasticity in alumunium 2024 alloy processed by high-pressure torsion
AU - Alhamidi, Ali
AU - Horita, Zenji
N1 - Funding Information:
One of the authors (AA) would like to thank Indonesian Government for a PhD scholarship through the Directorate of Higher Education Program (DGHE). This work was supported in part by Japan Science and Technology Agency (JST) under Collaborative Research Based on Industrial Demand “Heterogeneous Structure Control: Towards Innovative Development of Metallic Structural Materials”, in part by the Light Metals Educational Foundation of Japan and in part by a Grant-in-Aid for Scientific Research from the MEXT , Japan, in Innovative Areas “Bulk Nanostructured Metals” 22102004 .
Publisher Copyright:
© 2014 Elsevier B.V.
PY - 2015/1/2
Y1 - 2015/1/2
N2 - An Al-2024 alloy was processed by high-pressure torsion (HPT) to produce an ultrafine-grained structure with a grain size of ~240 nm. A maximum elongation of ~750% was attained with an initial strain rate of 1 × 10-2s-1 at 673 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.
AB - An Al-2024 alloy was processed by high-pressure torsion (HPT) to produce an ultrafine-grained structure with a grain size of ~240 nm. A maximum elongation of ~750% was attained with an initial strain rate of 1 × 10-2s-1 at 673 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.
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U2 - 10.1016/j.msea.2014.11.009
DO - 10.1016/j.msea.2014.11.009
M3 - Article
AN - SCOPUS:84912028923
SN - 0921-5093
VL - 622
SP - 139
EP - 145
JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
ER -