Microstructure and precipitation in Al-Li-Cu-Mg-(Mn, Zr) alloys
Microstructure and precipitation in Al-Li-Cu-Mg-(Mn, Zr) alloys
Hot rolled Al-6Li-1Cu-1Mg-0.2Mn (at.%) (Al-1.6Li-2.2Cu-0.9Mg-0.4Mn, wt.%) and Al-6Li-1Cu-1Mg-0.03Zr (at.%) (Al-1.6Li-2.3Cu-1Mg-0.1Zr, wt.%) alloys developed for age forming were studied by tensile testing, electron backscatter diffraction (EBSD), three-dimensional atom probe (3DAP), transmission electron microscopy (TEM) and differential scanning calorimetry (DSC). For both alloys, DSC analysis shows that ageing at 150°C leads initially to formation of zones/clusters, which are later gradually replaced by S phase. On ageing at 190°C, S phase formation is completed within 12 h. The precipitates identified by 3D atom probe and TEM can be classified into (a) Li-rich clusters containing Cu and Mg, (b) a plate-shaped metastable precipitate (similar to GPB2 zones/S''), (c) S phase and (d) delta' spherical particles rich in Li. The Zr containing alloy also contains beta' (Al3Zr) precipitates and composite beta'/delta' particles. The beta' precipitates reduces recrystallisation and grain growth leading to fine grains and subgrains.
Al-Li-Cu-Mg alloy, 3DAP, TEM, DSC, age forming
1010-1018
Gao, N.
9c1370f7-f4a9-4109-8a3a-4089b3baec21
Starink, M.J.
fe61a323-4e0c-49c7-91f0-4450e1ec1e51
Davin, L.
9eda8125-60c9-4be9-ad97-af73b829cecb
Cerezo, A.
2071e813-6bf2-4d2e-838d-33d0220f279f
Wang, S.C.
8a390e2d-6552-4c7c-a88f-25bf9d6986a6
Gregson, P.J.
ddc3b65d-18fb-4c11-9fa1-feb7e9cbe9fe
2005
Gao, N.
9c1370f7-f4a9-4109-8a3a-4089b3baec21
Starink, M.J.
fe61a323-4e0c-49c7-91f0-4450e1ec1e51
Davin, L.
9eda8125-60c9-4be9-ad97-af73b829cecb
Cerezo, A.
2071e813-6bf2-4d2e-838d-33d0220f279f
Wang, S.C.
8a390e2d-6552-4c7c-a88f-25bf9d6986a6
Gregson, P.J.
ddc3b65d-18fb-4c11-9fa1-feb7e9cbe9fe
Gao, N., Starink, M.J., Davin, L., Cerezo, A., Wang, S.C. and Gregson, P.J.
(2005)
Microstructure and precipitation in Al-Li-Cu-Mg-(Mn, Zr) alloys.
Materials Science and Technology, 21 (9), .
(doi:10.1179/174328405X27034).
Abstract
Hot rolled Al-6Li-1Cu-1Mg-0.2Mn (at.%) (Al-1.6Li-2.2Cu-0.9Mg-0.4Mn, wt.%) and Al-6Li-1Cu-1Mg-0.03Zr (at.%) (Al-1.6Li-2.3Cu-1Mg-0.1Zr, wt.%) alloys developed for age forming were studied by tensile testing, electron backscatter diffraction (EBSD), three-dimensional atom probe (3DAP), transmission electron microscopy (TEM) and differential scanning calorimetry (DSC). For both alloys, DSC analysis shows that ageing at 150°C leads initially to formation of zones/clusters, which are later gradually replaced by S phase. On ageing at 190°C, S phase formation is completed within 12 h. The precipitates identified by 3D atom probe and TEM can be classified into (a) Li-rich clusters containing Cu and Mg, (b) a plate-shaped metastable precipitate (similar to GPB2 zones/S''), (c) S phase and (d) delta' spherical particles rich in Li. The Zr containing alloy also contains beta' (Al3Zr) precipitates and composite beta'/delta' particles. The beta' precipitates reduces recrystallisation and grain growth leading to fine grains and subgrains.
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Mat_Sci_Tech_21-2005-1010.pdf
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Published date: 2005
Keywords:
Al-Li-Cu-Mg alloy, 3DAP, TEM, DSC, age forming
Identifiers
Local EPrints ID: 19164
URI: http://eprints.soton.ac.uk/id/eprint/19164
ISSN: 0267-0836
PURE UUID: 6fd9b22c-8ca8-41e2-89d9-3219de449df4
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Date deposited: 16 Jan 2006
Last modified: 16 Mar 2024 03:21
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Author:
L. Davin
Author:
A. Cerezo
Author:
P.J. Gregson
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