The microstructure length scale of strain rate sensitivity in ultrafine-grained aluminum
The microstructure length scale of strain rate sensitivity in ultrafine-grained aluminum
The mechanical properties of ultrafine-grained aluminum produced by equal-channel angular pressing (ECAP) are strongly influenced by strain rate. In this work, an experimental investigation of local strain rate sensitivity as it relates to microstructure was performed using a combination of scanning electron microscopy and digital image correlation. Uniaxial tension tests were carried out at 200 °C and strain rates alternating between 2.5 × 10?5 s?1 and 3.0 × 10?3 s?1. The results demonstrate that the heterogeneous microstructure generated by ECAP has a strong effect on the microstructure scale strain rate sensitivity. Deformation centered at grain boundaries separating regions of banded microstructure exhibits the greatest strain rate sensitivity. Strain rate sensitivity is limited in deformation occurring in regions of microstructure composed of ultrafine grains separated by low-angle grain boundaries. The tensile specimens all failed by shear bands at 200 °C and at room temperature they failed by necking with little plastic deformation apparent outside of the neck.
metal, nanostructure, scanning electron microscopy (SEM)
981-992
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
20 March 2015
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
(2015)
The microstructure length scale of strain rate sensitivity in ultrafine-grained aluminum.
Journal of Materials Research, 30 (7), .
(doi:10.1557/jmr.2015.58).
Abstract
The mechanical properties of ultrafine-grained aluminum produced by equal-channel angular pressing (ECAP) are strongly influenced by strain rate. In this work, an experimental investigation of local strain rate sensitivity as it relates to microstructure was performed using a combination of scanning electron microscopy and digital image correlation. Uniaxial tension tests were carried out at 200 °C and strain rates alternating between 2.5 × 10?5 s?1 and 3.0 × 10?3 s?1. The results demonstrate that the heterogeneous microstructure generated by ECAP has a strong effect on the microstructure scale strain rate sensitivity. Deformation centered at grain boundaries separating regions of banded microstructure exhibits the greatest strain rate sensitivity. Strain rate sensitivity is limited in deformation occurring in regions of microstructure composed of ultrafine grains separated by low-angle grain boundaries. The tensile specimens all failed by shear bands at 200 °C and at room temperature they failed by necking with little plastic deformation apparent outside of the neck.
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Accepted/In Press date: 24 February 2015
Published date: 20 March 2015
Keywords:
metal, nanostructure, scanning electron microscopy (SEM)
Organisations:
Engineering Mats & Surface Engineerg Gp
Identifiers
Local EPrints ID: 377270
URI: http://eprints.soton.ac.uk/id/eprint/377270
PURE UUID: 816e8af8-d83b-4160-b336-067c0b64aca6
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Date deposited: 20 May 2015 11:06
Last modified: 15 Mar 2024 03:14
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Contributors
Author:
Adam D. Kammers
Author:
Jittraporn Wongsa-Ngam
Author:
Samantha Daly
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