Microstructure and strength modelling of Al-Cu-Mg alloys during non-isothermal treatments: part 2 - Welds
Microstructure and strength modelling of Al-Cu-Mg alloys during non-isothermal treatments: part 2 - Welds
The present work applies a model for microstructural evolution in the solid state and Al-Cu-Mg alloys and expands it in a computationally efficient way to include solid-liquid reactions in fusion welds. The model is used to predict local strength and hardness of the welds, using a formulation that incorporates hardening due to two types of precipitates i.e. Cu-Mg co-clusters and the S phase precipitates. The model predictions are compared with hardness, differential scanning calorimetry and transmission electron microscopy data for a fusion welded 2024-T351 aluminium alloy. The model predicts solid state reactions and solid-liquid reactions including co-cluster dissolution, S phase formation, growth, coarsening and dissolution, co-cluster reformation on cooling, and solute partitioning on re-solidification. The model predictions are in good agreement with the experimental results and illustrate the dominant role that (sub-) nano scale co-clusters play in strengthening of welds. The yield strength of as-welded material tested normal to the weld is mainly due to the co-clusters.
aluminium alloys, welds, VPPA weld, fusion weld, ageing, modelling, phase transformations, co-clusters, 2024, 2x24, Al-Cu-Mg, DSC, calorimetry, TEM, nucleation, coarsening, GPB zones, guinier-preston zones, precipitation, melting, incipient melting, solidification, aerospace alloy
1411-1418
Khan, I.N.
dd43e20e-693d-4f98-bf6b-3b8350ac9f06
Starink, M.J.
fe61a323-4e0c-49c7-91f0-4450e1ec1e51
Sinclair, I.
6005f6c1-f478-434e-a52d-d310c18ade0d
Wang, S.C.
8a390e2d-6552-4c7c-a88f-25bf9d6986a6
2008
Khan, I.N.
dd43e20e-693d-4f98-bf6b-3b8350ac9f06
Starink, M.J.
fe61a323-4e0c-49c7-91f0-4450e1ec1e51
Sinclair, I.
6005f6c1-f478-434e-a52d-d310c18ade0d
Wang, S.C.
8a390e2d-6552-4c7c-a88f-25bf9d6986a6
Khan, I.N., Starink, M.J., Sinclair, I. and Wang, S.C.
(2008)
Microstructure and strength modelling of Al-Cu-Mg alloys during non-isothermal treatments: part 2 - Welds.
Materials Science and Technology, 24, .
Abstract
The present work applies a model for microstructural evolution in the solid state and Al-Cu-Mg alloys and expands it in a computationally efficient way to include solid-liquid reactions in fusion welds. The model is used to predict local strength and hardness of the welds, using a formulation that incorporates hardening due to two types of precipitates i.e. Cu-Mg co-clusters and the S phase precipitates. The model predictions are compared with hardness, differential scanning calorimetry and transmission electron microscopy data for a fusion welded 2024-T351 aluminium alloy. The model predicts solid state reactions and solid-liquid reactions including co-cluster dissolution, S phase formation, growth, coarsening and dissolution, co-cluster reformation on cooling, and solute partitioning on re-solidification. The model predictions are in good agreement with the experimental results and illustrate the dominant role that (sub-) nano scale co-clusters play in strengthening of welds. The yield strength of as-welded material tested normal to the weld is mainly due to the co-clusters.
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Khan_et_al_MST_2008_mst8246_J_pdf.pdf
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Published date: 2008
Keywords:
aluminium alloys, welds, VPPA weld, fusion weld, ageing, modelling, phase transformations, co-clusters, 2024, 2x24, Al-Cu-Mg, DSC, calorimetry, TEM, nucleation, coarsening, GPB zones, guinier-preston zones, precipitation, melting, incipient melting, solidification, aerospace alloy
Organisations:
Engineering Mats & Surface Engineerg Gp
Identifiers
Local EPrints ID: 50900
URI: http://eprints.soton.ac.uk/id/eprint/50900
ISSN: 0267-0836
PURE UUID: d1ad11ca-394b-4efa-b34e-9c9eebc78e3b
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Date deposited: 11 Apr 2008
Last modified: 15 Mar 2024 10:13
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Author:
I.N. Khan
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