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VPPA welds of Al-2024 alloys: analysis and modelling of local microstructure and strength

VPPA welds of Al-2024 alloys: analysis and modelling of local microstructure and strength
VPPA welds of Al-2024 alloys: analysis and modelling of local microstructure and strength
The microstructural features of variable polarity plasma arc welded Al-Cu-Mg 2024-T351 with 2319 filler have been studied by TEM, SEM and DSC. Fusion zone, partial melting zone, re-solutionising zone, overageing (for S phase), peak ageing (for S phase) and under ageing zones (for S phase) have been identified. The omega phase has been observed between re-solutionising zone and peak ageing zone. The hardness profile contains two peaks. The microstructure development, and resulting hardness and yield strength profiles are modelled using a model which combines primary precipitation, resolution, partial/full melting and resolidification (Scheil type) and re-precipitation, in a two precipitate – two mechanism approach. Hardness profiles and microstructures are accurately predicted. The hardness peak in the re-solutionising zone is due to re-solutionising and subsequent Cu-Mg co-cluster formation; and the second hardness peak is caused by S phase strengthening.
Al-Cu-Mg alloy, microstructure modelling, TEM, DSC, co-clusters, hardness, VPPA weld, solidification
0921-5093
123-136
Wang, S.C.
8a390e2d-6552-4c7c-a88f-25bf9d6986a6
Lefebvre, F.
352c352b-3d9b-4d32-82de-142121ba7353
Yan, J.L.
5f230a2d-0201-41fb-8469-e6c9a95c03b7
Sinclair, I.
6005f6c1-f478-434e-a52d-d310c18ade0d
Starink, M.J.
fe61a323-4e0c-49c7-91f0-4450e1ec1e51
Wang, S.C.
8a390e2d-6552-4c7c-a88f-25bf9d6986a6
Lefebvre, F.
352c352b-3d9b-4d32-82de-142121ba7353
Yan, J.L.
5f230a2d-0201-41fb-8469-e6c9a95c03b7
Sinclair, I.
6005f6c1-f478-434e-a52d-d310c18ade0d
Starink, M.J.
fe61a323-4e0c-49c7-91f0-4450e1ec1e51

Wang, S.C., Lefebvre, F., Yan, J.L., Sinclair, I. and Starink, M.J. (2006) VPPA welds of Al-2024 alloys: analysis and modelling of local microstructure and strength. Materials Science and Engineering: A, 431 (1-2), 123-136. (doi:10.1016/j.msea.2006.05.120).

Record type: Article

Abstract

The microstructural features of variable polarity plasma arc welded Al-Cu-Mg 2024-T351 with 2319 filler have been studied by TEM, SEM and DSC. Fusion zone, partial melting zone, re-solutionising zone, overageing (for S phase), peak ageing (for S phase) and under ageing zones (for S phase) have been identified. The omega phase has been observed between re-solutionising zone and peak ageing zone. The hardness profile contains two peaks. The microstructure development, and resulting hardness and yield strength profiles are modelled using a model which combines primary precipitation, resolution, partial/full melting and resolidification (Scheil type) and re-precipitation, in a two precipitate – two mechanism approach. Hardness profiles and microstructures are accurately predicted. The hardness peak in the re-solutionising zone is due to re-solutionising and subsequent Cu-Mg co-cluster formation; and the second hardness peak is caused by S phase strengthening.

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Published date: 2006
Keywords: Al-Cu-Mg alloy, microstructure modelling, TEM, DSC, co-clusters, hardness, VPPA weld, solidification
Organisations: Engineering Mats & Surface Engineerg Gp, Engineering Sciences

Identifiers

Local EPrints ID: 41237
URI: http://eprints.soton.ac.uk/id/eprint/41237
ISSN: 0921-5093
PURE UUID: a7d94de7-cb2d-4904-86f9-a55e0feaf793

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Date deposited: 07 Aug 2006
Last modified: 15 Mar 2024 08:25

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Contributors

Author: S.C. Wang
Author: F. Lefebvre
Author: J.L. Yan
Author: I. Sinclair
Author: M.J. Starink

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