Effect of grain size and specimen dimensions on micro-forming of high purity aluminum
Effect of grain size and specimen dimensions on micro-forming of high purity aluminum
Micro-compression testing was conducted using high purity Al processed by equal-channel angular pressing (ECAP) with both coarse-grained (CG) and ultrafine-grained (UFG) samples. The effects on the flow stresses of the initial grain size and the specimen size were investigated and the results show the initial grain sizes and the specimen dimensions affect the flow stresses during micro-compression for both CG and UFG specimens. There is a transition from strain hardening to strain softening with decreasing grain size during micro-compression but the transition grain size is dependent upon the size of the specimen. These results are interpreted using a model based on the separate influences of dislocation annihilation and dislocation accumulation in the UFG and CG materials, respectively. The results demonstrate that the occurrence of surface roughening is improved when using UFG pure Al and this shows there is a significant potential for using UFG pure Al in micro-forming operations.
aluminum, equal-channel angular pressing, micro-forming, size effects, ultrafine grains
207-217
Xu, Jie
593871b5-a17a-4e0f-ae0e-7e48b1aadd99
Zhu, Xiaocheng
fbce4cb2-a109-48b3-99da-64d55dbbf616
Shan, Debin
fd8652eb-1eeb-4ae2-bcc4-102320f3c2d7
Guo, Bin
6454155d-fa5f-480b-8747-88d06498a923
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
14 October 2015
Xu, Jie
593871b5-a17a-4e0f-ae0e-7e48b1aadd99
Zhu, Xiaocheng
fbce4cb2-a109-48b3-99da-64d55dbbf616
Shan, Debin
fd8652eb-1eeb-4ae2-bcc4-102320f3c2d7
Guo, Bin
6454155d-fa5f-480b-8747-88d06498a923
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Xu, Jie, Zhu, Xiaocheng, Shan, Debin, Guo, Bin and Langdon, Terence G.
(2015)
Effect of grain size and specimen dimensions on micro-forming of high purity aluminum.
Materials Science and Engineering: A, 646, .
(doi:10.1016/j.msea.2015.08.060).
Abstract
Micro-compression testing was conducted using high purity Al processed by equal-channel angular pressing (ECAP) with both coarse-grained (CG) and ultrafine-grained (UFG) samples. The effects on the flow stresses of the initial grain size and the specimen size were investigated and the results show the initial grain sizes and the specimen dimensions affect the flow stresses during micro-compression for both CG and UFG specimens. There is a transition from strain hardening to strain softening with decreasing grain size during micro-compression but the transition grain size is dependent upon the size of the specimen. These results are interpreted using a model based on the separate influences of dislocation annihilation and dislocation accumulation in the UFG and CG materials, respectively. The results demonstrate that the occurrence of surface roughening is improved when using UFG pure Al and this shows there is a significant potential for using UFG pure Al in micro-forming operations.
Text
__userfiles.soton.ac.uk_Library_SLAs_Work_for_ALL's_Work_for_ePrints_Accepted Manuscripts_Xu_Effect.pdf
- Accepted Manuscript
More information
Accepted/In Press date: 18 August 2015
e-pub ahead of print date: 20 August 2015
Published date: 14 October 2015
Keywords:
aluminum, equal-channel angular pressing, micro-forming, size effects, ultrafine grains
Organisations:
Engineering Mats & Surface Engineerg Gp
Identifiers
Local EPrints ID: 382387
URI: http://eprints.soton.ac.uk/id/eprint/382387
ISSN: 0921-5093
PURE UUID: 2e404186-2360-47c3-a98e-362615314ab4
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Date deposited: 27 Oct 2015 10:44
Last modified: 15 Mar 2024 03:14
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Contributors
Author:
Jie Xu
Author:
Xiaocheng Zhu
Author:
Debin Shan
Author:
Bin Guo
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