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Micro-deformation behavior in micro-compression with high-purity aluminum processed by ECAP

Micro-deformation behavior in micro-compression with high-purity aluminum processed by ECAP
Micro-deformation behavior in micro-compression with high-purity aluminum processed by ECAP
Ultrafine-grained (UFG) materials have a potential for applications in micro-forming since grain size appears to be the dominant factor which determines the limiting size of the geometrical features. In this research, high-purity Al was processed by equal-channel angular pressing (ECAP) at room temperature through 1–8 passes. Analysis shows that processing by ECAP produces a UFG structure with a grain size of ~1.3 ?m and with microhardness and microstructural homogeneity. Micro-compression testing was carried out with different specimen dimensions using the annealed sample and after ECAP processing through 1–8 passes. The results show the flow stress increases significantly after ECAP processing by comparison with the annealed material. The flow stress generally reaches a maximum value after 2 passes which is consistent with the results of microhardness. The flow stress decreases with decreasing specimen diameter from 4 mm to 1 mm which demonstrates that size effects also exist in the ultrafine-grained materials. However, the deformation mechanism in ultrafine-grained pure Al changes from strain strengthening to softening by dynamic recovery by comparison with the annealed material.
micro-deformation, aluminium, ECAP, micro-forming, ultrafine grains
2265-4224
1-6
Xu, Jie
593871b5-a17a-4e0f-ae0e-7e48b1aadd99
Wang, Chenxi
86ad4b4b-2e95-448a-812c-6c68a4e7f5b0
Shan, Debin
fd8652eb-1eeb-4ae2-bcc4-102320f3c2d7
Guo, Bin
6454155d-fa5f-480b-8747-88d06498a923
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Xu, Jie
593871b5-a17a-4e0f-ae0e-7e48b1aadd99
Wang, Chenxi
86ad4b4b-2e95-448a-812c-6c68a4e7f5b0
Shan, Debin
fd8652eb-1eeb-4ae2-bcc4-102320f3c2d7
Guo, Bin
6454155d-fa5f-480b-8747-88d06498a923
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

Xu, Jie, Wang, Chenxi, Shan, Debin, Guo, Bin and Langdon, Terence G. (2015) Micro-deformation behavior in micro-compression with high-purity aluminum processed by ECAP. Manufacturing Review, 2, 1-6. (doi:10.1051/mfreview/2015003).

Record type: Article

Abstract

Ultrafine-grained (UFG) materials have a potential for applications in micro-forming since grain size appears to be the dominant factor which determines the limiting size of the geometrical features. In this research, high-purity Al was processed by equal-channel angular pressing (ECAP) at room temperature through 1–8 passes. Analysis shows that processing by ECAP produces a UFG structure with a grain size of ~1.3 ?m and with microhardness and microstructural homogeneity. Micro-compression testing was carried out with different specimen dimensions using the annealed sample and after ECAP processing through 1–8 passes. The results show the flow stress increases significantly after ECAP processing by comparison with the annealed material. The flow stress generally reaches a maximum value after 2 passes which is consistent with the results of microhardness. The flow stress decreases with decreasing specimen diameter from 4 mm to 1 mm which demonstrates that size effects also exist in the ultrafine-grained materials. However, the deformation mechanism in ultrafine-grained pure Al changes from strain strengthening to softening by dynamic recovery by comparison with the annealed material.

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More information

Accepted/In Press date: 9 February 2015
Published date: 17 March 2015
Keywords: micro-deformation, aluminium, ECAP, micro-forming, ultrafine grains
Organisations: Engineering Mats & Surface Engineerg Gp

Identifiers

Local EPrints ID: 377273
URI: http://eprints.soton.ac.uk/id/eprint/377273
ISSN: 2265-4224
PURE UUID: d1e5a752-68c6-4f53-949e-6bfc15badb33
ORCID for Terence G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

Catalogue record

Date deposited: 20 May 2015 14:21
Last modified: 15 Mar 2024 03:14

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Contributors

Author: Jie Xu
Author: Chenxi Wang
Author: Debin Shan
Author: Bin Guo

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