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Microstructure and strengthening of Al-Li-Cu-Mg alloys and MMCs: I. Analysis and modelling of microstructural changes

Microstructure and strengthening of Al-Li-Cu-Mg alloys and MMCs: I. Analysis and modelling of microstructural changes
Microstructure and strengthening of Al-Li-Cu-Mg alloys and MMCs: I. Analysis and modelling of microstructural changes
A complete and detailed analysis of the microstructural development during ageing in an 8090 (Al–2.3Li–1.2Cu–1Mg–0.1Zr) alloy, an 8090/20 wt% SiCp MMC, an Al–1.5Li–Cu–Mg MMC and an Al–Cu–Mg MMC (all with similar Cu and Mg contents) has been performed. Volume fractions of all precipitates relevant for precipitation strengthening of the alloys (?? phase, S? phase and GPB zones) have been determined using a recently derived method based on differential scanning calorimetry (DSC). The volume fractions have subsequently been successfully fitted using a novel model for transformation kinetics. The sizes of these precipitates have been analysed using newly derived expressions consistent with the latter model. As a result of dislocation generation around misfitting SiC particles the volume fractions of both GPB zones and S? phase depend strongly on the presence of these particles. Also the amount of Li present in the alloys influences the volume fractions of the phases significantly. The sizes of S? are similar for the four alloys.
differential thermal analysis (DTA), aluminium, aging, microstructure, kinetics theory and modeling
1359-6454
3841-3853
Starink, M.J.
fe61a323-4e0c-49c7-91f0-4450e1ec1e51
Wang, P.
df957848-e6e4-45f0-ba01-2d966a30aa67
Sinclair, I.
6005f6c1-f478-434e-a52d-d310c18ade0d
Gregson, P.J.
ddc3b65d-18fb-4c11-9fa1-feb7e9cbe9fe
Starink, M.J.
fe61a323-4e0c-49c7-91f0-4450e1ec1e51
Wang, P.
df957848-e6e4-45f0-ba01-2d966a30aa67
Sinclair, I.
6005f6c1-f478-434e-a52d-d310c18ade0d
Gregson, P.J.
ddc3b65d-18fb-4c11-9fa1-feb7e9cbe9fe

Starink, M.J., Wang, P., Sinclair, I. and Gregson, P.J. (1999) Microstructure and strengthening of Al-Li-Cu-Mg alloys and MMCs: I. Analysis and modelling of microstructural changes. Acta Materialia, 47 (14), 3841-3853. (doi:10.1016/S1359-6454(99)00227-X).

Record type: Article

Abstract

A complete and detailed analysis of the microstructural development during ageing in an 8090 (Al–2.3Li–1.2Cu–1Mg–0.1Zr) alloy, an 8090/20 wt% SiCp MMC, an Al–1.5Li–Cu–Mg MMC and an Al–Cu–Mg MMC (all with similar Cu and Mg contents) has been performed. Volume fractions of all precipitates relevant for precipitation strengthening of the alloys (?? phase, S? phase and GPB zones) have been determined using a recently derived method based on differential scanning calorimetry (DSC). The volume fractions have subsequently been successfully fitted using a novel model for transformation kinetics. The sizes of these precipitates have been analysed using newly derived expressions consistent with the latter model. As a result of dislocation generation around misfitting SiC particles the volume fractions of both GPB zones and S? phase depend strongly on the presence of these particles. Also the amount of Li present in the alloys influences the volume fractions of the phases significantly. The sizes of S? are similar for the four alloys.

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Published date: 1999
Keywords: differential thermal analysis (DTA), aluminium, aging, microstructure, kinetics theory and modeling

Identifiers

Local EPrints ID: 21680
URI: http://eprints.soton.ac.uk/id/eprint/21680
ISSN: 1359-6454
PURE UUID: 5ea40846-9431-40ae-af0c-e4c2cf90de3a

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Date deposited: 27 Feb 2007
Last modified: 15 Mar 2024 06:31

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Contributors

Author: M.J. Starink
Author: P. Wang
Author: I. Sinclair
Author: P.J. Gregson

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