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Microstructure and strength modelling of Al-Cu-Mg alloys during non-isothermal treatments: part 2 - Welds

Record type: Article

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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Citation

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, pp. 1411-1418.

More information

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

Catalogue record

Date deposited: 11 Apr 2008
Last modified: 17 Jul 2017 14:50

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Contributors

Author: I.N. Khan
Author: M.J. Starink
Author: I. Sinclair
Author: S.C. Wang

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