The effect of microstructure heterogeneity on the microscale deformation of ultrafine-grained aluminum
The effect of microstructure heterogeneity on the microscale deformation of ultrafine-grained aluminum
A combined approach of scanning electron microscopy and digital image correlation was used to examine microstructure-scale strain localization and active deformation mechanisms in ultrafine-grained (UFG) high purity (99.99%) aluminum processed by equal-channel angular pressing (ECAP). The results from tensile tests demonstrate a strong relationship between the heterogeneous microstructure and strain localization. The localized deformation was investigated in areas that contain significantly different microstructural features typical of ECAP processed aluminum. It was found that areas of the UFG microstructure containing primarily low angle grain boundaries deformed by dislocation slip and behaved similarly to a coarse-grained material. The greatest strain localization occurred at high angle grain boundaries (HAGBs) separating distinct microstructure regions and with median surface trace angles of approximately 26.6°. In areas of banded microstructure, shear strain localization as high as 30% and shear displacements of up to 500 nm occurred at the HAGBs separating bands, suggesting grain boundary sliding.
metal, nanostructure, scanning electron microscopy (SEM)
1664-1674
Kammers, Adam D.
d70634c1-4b03-4969-a740-71d335e72823
Wongsa-Ngam, Jittraporn
3a196159-d8e5-4658-a47b-a6f6c5a7dcc7
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Daly, Samantha
1442d9a3-8d8b-4064-87ce-e8fdb6d37856
12 August 2014
Kammers, Adam D.
d70634c1-4b03-4969-a740-71d335e72823
Wongsa-Ngam, Jittraporn
3a196159-d8e5-4658-a47b-a6f6c5a7dcc7
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Daly, Samantha
1442d9a3-8d8b-4064-87ce-e8fdb6d37856
Kammers, Adam D., Wongsa-Ngam, Jittraporn, Langdon, Terence G. and Daly, Samantha
(2014)
The effect of microstructure heterogeneity on the microscale deformation of ultrafine-grained aluminum.
Journal of Materials Research, 29 (15), .
(doi:10.1557/jmr.2014.207).
Abstract
A combined approach of scanning electron microscopy and digital image correlation was used to examine microstructure-scale strain localization and active deformation mechanisms in ultrafine-grained (UFG) high purity (99.99%) aluminum processed by equal-channel angular pressing (ECAP). The results from tensile tests demonstrate a strong relationship between the heterogeneous microstructure and strain localization. The localized deformation was investigated in areas that contain significantly different microstructural features typical of ECAP processed aluminum. It was found that areas of the UFG microstructure containing primarily low angle grain boundaries deformed by dislocation slip and behaved similarly to a coarse-grained material. The greatest strain localization occurred at high angle grain boundaries (HAGBs) separating distinct microstructure regions and with median surface trace angles of approximately 26.6°. In areas of banded microstructure, shear strain localization as high as 30% and shear displacements of up to 500 nm occurred at the HAGBs separating bands, suggesting grain boundary sliding.
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Published date: 12 August 2014
Keywords:
metal, nanostructure, scanning electron microscopy (SEM)
Organisations:
Engineering Mats & Surface Engineerg Gp
Identifiers
Local EPrints ID: 372289
URI: http://eprints.soton.ac.uk/id/eprint/372289
PURE UUID: c28337eb-2b04-422b-a86e-bee3121c6889
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Date deposited: 04 Dec 2014 16:50
Last modified: 15 Mar 2024 03:13
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Contributors
Author:
Adam D. Kammers
Author:
Jittraporn Wongsa-Ngam
Author:
Samantha Daly
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