Microstructural evolution in high purity aluminum processed by ECAP
Microstructural evolution in high purity aluminum processed by ECAP
High purity (99.99%) aluminum was processed by equal-channel angular pressing (ECAP) through 1–12 passes and examined using orientation imaging microscopy. The results reveal two distinct processing regimes: from 1 to 4 passes the microstructure evolves from elongated subgrains to an essentially equiaxed array of ultrafine grains and from 4 to 12 passes there is no measurable change in the average grain size and grain aspect ratio. The boundary misorientation angle and the fraction of high-angle boundaries increase rapidly up to 4 passes and at a slower rate from 4 to 12 passes. Anomalously large grains were visible in the central region of the billet pressed through 12 passes due to dynamic recovery and grain growth. The results suggest optimum processing is achieved by pressing through 4–8 passes
aluminum, equal-channel angular pressing, grain boundary misorientations, microstructure, ultrafine grains
143-150
Kawasaki, Megumi
944ba471-eb78-46db-bfb7-3f0296d9ef6d
Horita, Zenji
011521b8-3b29-494b-bf3f-346827ddbcce
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
2009
Kawasaki, Megumi
944ba471-eb78-46db-bfb7-3f0296d9ef6d
Horita, Zenji
011521b8-3b29-494b-bf3f-346827ddbcce
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Kawasaki, Megumi, Horita, Zenji and Langdon, Terence G.
(2009)
Microstructural evolution in high purity aluminum processed by ECAP.
Materials Science and Engineering: A, 524 (1-2), .
(doi:10.1016/j.msea.2009.06.032).
Abstract
High purity (99.99%) aluminum was processed by equal-channel angular pressing (ECAP) through 1–12 passes and examined using orientation imaging microscopy. The results reveal two distinct processing regimes: from 1 to 4 passes the microstructure evolves from elongated subgrains to an essentially equiaxed array of ultrafine grains and from 4 to 12 passes there is no measurable change in the average grain size and grain aspect ratio. The boundary misorientation angle and the fraction of high-angle boundaries increase rapidly up to 4 passes and at a slower rate from 4 to 12 passes. Anomalously large grains were visible in the central region of the billet pressed through 12 passes due to dynamic recovery and grain growth. The results suggest optimum processing is achieved by pressing through 4–8 passes
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Published date: 2009
Keywords:
aluminum, equal-channel angular pressing, grain boundary misorientations, microstructure, ultrafine grains
Organisations:
Engineering Mats & Surface Engineerg Gp
Identifiers
Local EPrints ID: 72330
URI: http://eprints.soton.ac.uk/id/eprint/72330
ISSN: 0921-5093
PURE UUID: 90a20475-9264-4cd6-9f3f-4017df102b73
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Date deposited: 09 Feb 2010
Last modified: 14 Mar 2024 02:47
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Contributors
Author:
Megumi Kawasaki
Author:
Zenji Horita
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