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Synchrotron X-ray microbeam diffraction measurements of full elastic long range internal strain and stress tensors in commercial-purity aluminum processed by multiple passes of equal-channel angular pressing

Synchrotron X-ray microbeam diffraction measurements of full elastic long range internal strain and stress tensors in commercial-purity aluminum processed by multiple passes of equal-channel angular pressing
Synchrotron X-ray microbeam diffraction measurements of full elastic long range internal strain and stress tensors in commercial-purity aluminum processed by multiple passes of equal-channel angular pressing
Synchrotron X-ray microbeam diffraction was used to measure the full elastic long range internal strain and stress tensors of low dislocation density regions within the submicrometer grain/subgrain structure of equal-channel angular pressed (ECAP) aluminum alloy AA1050 after 1, 2, and 8 passes using route BC. This is the first time that full tensors were measured in plastically deformed metals at this length scale. The maximum (most tensile or least compressive) principal elastic strain directions for the unloaded 1 pass sample for the grain/subgrain interiors align well with the pressing direction, and are more random for the 2 and 8 pass samples. The measurements reported here indicate that the local stresses and strains become increasingly isotropic (homogenized) with increasing ECAP passes using route BC. The average maximum (in magnitude) LRISs are ?0.43 ?a for 1 pass, ?0.44 ?a for 2 pass, and 0.14 ?a for the 8 pass sample. These LRISs are larger than those reported previously because those earlier measurements were unable to measure the full stress tensor. Significantly, the measured stresses are inconsistent with the two-component composite model.
1359-6454
231-241
Phan, Thien Q.
513a3f96-a8e2-424f-9f69-bab737cdbc80
Levine, Lyle E.
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Lee, I-Fang
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Xu, Ruqing
dfe5e720-b8eb-40e9-895e-0aa1160b1667
Tischler, Jonathan Z.
fd4283bf-5074-47f4-96cc-5b1e013dd31b
Huang, Yi
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Langdon, Terence G.
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Kassner, Michael E.
44ea4d79-4e98-4160-b3d4-40335133fe9a
Phan, Thien Q.
513a3f96-a8e2-424f-9f69-bab737cdbc80
Levine, Lyle E.
1368aa5f-76e8-4750-b4a5-a377147c3956
Lee, I-Fang
9b1c09ae-c623-4096-b66f-2cfa34573296
Xu, Ruqing
dfe5e720-b8eb-40e9-895e-0aa1160b1667
Tischler, Jonathan Z.
fd4283bf-5074-47f4-96cc-5b1e013dd31b
Huang, Yi
9f4df815-51c1-4ee8-ad63-a92bf997103e
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Kassner, Michael E.
44ea4d79-4e98-4160-b3d4-40335133fe9a

Phan, Thien Q., Levine, Lyle E., Lee, I-Fang, Xu, Ruqing, Tischler, Jonathan Z., Huang, Yi, Langdon, Terence G. and Kassner, Michael E. (2016) Synchrotron X-ray microbeam diffraction measurements of full elastic long range internal strain and stress tensors in commercial-purity aluminum processed by multiple passes of equal-channel angular pressing. Acta Materialia, 112, 231-241. (doi:10.1016/j.actamat.2016.04.035).

Record type: Article

Abstract

Synchrotron X-ray microbeam diffraction was used to measure the full elastic long range internal strain and stress tensors of low dislocation density regions within the submicrometer grain/subgrain structure of equal-channel angular pressed (ECAP) aluminum alloy AA1050 after 1, 2, and 8 passes using route BC. This is the first time that full tensors were measured in plastically deformed metals at this length scale. The maximum (most tensile or least compressive) principal elastic strain directions for the unloaded 1 pass sample for the grain/subgrain interiors align well with the pressing direction, and are more random for the 2 and 8 pass samples. The measurements reported here indicate that the local stresses and strains become increasingly isotropic (homogenized) with increasing ECAP passes using route BC. The average maximum (in magnitude) LRISs are ?0.43 ?a for 1 pass, ?0.44 ?a for 2 pass, and 0.14 ?a for the 8 pass sample. These LRISs are larger than those reported previously because those earlier measurements were unable to measure the full stress tensor. Significantly, the measured stresses are inconsistent with the two-component composite model.

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Accepted/In Press date: 14 April 2016
e-pub ahead of print date: 24 April 2016
Published date: 15 June 2016
Organisations: Engineering Mats & Surface Engineerg Gp

Identifiers

Local EPrints ID: 393717
URI: http://eprints.soton.ac.uk/id/eprint/393717
ISSN: 1359-6454
PURE UUID: ecec9d5d-9bad-4905-bdec-3b4a9c7d498f
ORCID for Yi Huang: ORCID iD orcid.org/0000-0001-9259-8123
ORCID for Terence G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

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Date deposited: 03 May 2016 12:28
Last modified: 15 Mar 2024 05:32

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Contributors

Author: Thien Q. Phan
Author: Lyle E. Levine
Author: I-Fang Lee
Author: Ruqing Xu
Author: Jonathan Z. Tischler
Author: Yi Huang ORCID iD
Author: Michael E. Kassner

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