Microstructural developments in a spray-cast Al-7034 alloy processed by equal-channel angular pressing
Microstructural developments in a spray-cast Al-7034 alloy processed by equal-channel angular pressing
A spray-cast Al-7034 alloy was processed by equal-channel angular pressing (ECAP) to produce an ultrafine submicrometer grain size. The microstructures of the as-received and as-pressed alloy were examined using several different experimental techniques including transmission electron microscopy (TEM), electron back-scatter diffraction (EBSD) and differential scanning calorimetry (DSC). The alloy contains ? phase (MgZn2) and Al3Zr precipitates and these precipitates serve to inhibit grain growth so that an ultrafine submicrometer grain size is retained at temperatures up to and above 600K. The results demonstrate an increase in the fraction of high-angle boundaries with increasing numbers of passes in ECAP and analysis of the DSC curves leads to the identification of several thermal effects involving the formation, coarsening and dissolution of the ?-phase. The rod-like ?-phase particles present in the as-received alloy are broken during ECAP and a detailed analysis suggests this breaking occurs primarily in the first pass of ECAP. Tensile tests at elevated temperature demonstrate a potential for achieving superplastic elongations in the as-pressed material.
equal-channel angular pressing, grain boundary misorientations, mechanical properties, precipitation, thermal processes
1-12
Starink, Marco J.
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Gao, Nong
9c1370f7-f4a9-4109-8a3a-4089b3baec21
Furukawa, Minoru
1ff823a3-0407-4215-889d-92fb66f8915c
Horita, Zenji
011521b8-3b29-494b-bf3f-346827ddbcce
Xu, Cheng
af526865-aee4-4ef6-8174-def5c38149a2
Langdon, Terrence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
2004
Starink, Marco J.
fe61a323-4e0c-49c7-91f0-4450e1ec1e51
Gao, Nong
9c1370f7-f4a9-4109-8a3a-4089b3baec21
Furukawa, Minoru
1ff823a3-0407-4215-889d-92fb66f8915c
Horita, Zenji
011521b8-3b29-494b-bf3f-346827ddbcce
Xu, Cheng
af526865-aee4-4ef6-8174-def5c38149a2
Langdon, Terrence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Starink, Marco J., Gao, Nong, Furukawa, Minoru, Horita, Zenji, Xu, Cheng and Langdon, Terrence G.
(2004)
Microstructural developments in a spray-cast Al-7034 alloy processed by equal-channel angular pressing.
Reviews on Advanced Materials Science, 7 (1), .
Abstract
A spray-cast Al-7034 alloy was processed by equal-channel angular pressing (ECAP) to produce an ultrafine submicrometer grain size. The microstructures of the as-received and as-pressed alloy were examined using several different experimental techniques including transmission electron microscopy (TEM), electron back-scatter diffraction (EBSD) and differential scanning calorimetry (DSC). The alloy contains ? phase (MgZn2) and Al3Zr precipitates and these precipitates serve to inhibit grain growth so that an ultrafine submicrometer grain size is retained at temperatures up to and above 600K. The results demonstrate an increase in the fraction of high-angle boundaries with increasing numbers of passes in ECAP and analysis of the DSC curves leads to the identification of several thermal effects involving the formation, coarsening and dissolution of the ?-phase. The rod-like ?-phase particles present in the as-received alloy are broken during ECAP and a detailed analysis suggests this breaking occurs primarily in the first pass of ECAP. Tensile tests at elevated temperature demonstrate a potential for achieving superplastic elongations in the as-pressed material.
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Published date: 2004
Keywords:
equal-channel angular pressing, grain boundary misorientations, mechanical properties, precipitation, thermal processes
Identifiers
Local EPrints ID: 22763
URI: http://eprints.soton.ac.uk/id/eprint/22763
ISSN: 1605-8127
PURE UUID: 4431dcf2-6aee-493a-9cf1-9d87b0767857
Catalogue record
Date deposited: 22 Mar 2006
Last modified: 11 May 2022 01:37
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Contributors
Author:
Minoru Furukawa
Author:
Zenji Horita
Author:
Cheng Xu
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