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Room temperature precipitation in quenched Al-Cu-Mg alloys: a model for the reaction kinetics and yield strength development

Record type: Article

The microstructural evolution during low temperature ageing of two commercial purity alloys (Al-1.2Cu-1.2Mg-0.2Mn and Al-1.9Cu-1.6Mg-0.2Mn at.%) was investigated. The initial stage of hardening in these alloys is very rapid, with the alloys nearly doubling in hardness during 20 h ageing at room temperature. The microstructural evolution during this stage of hardening was investigated using differential scanning calorimetry (DSC), isothermal calorimetry and three-dimensional atom probe analysis (3DAP). It is found that during the hardening a substantial exothermic heat evolution occurs and that the only microstructural change involves the formation of Cu-Mg co-clusters. The kinetics of cluster formation is analysed and the magnitude of the hardening is discussed on the basis of a model incorporating solid solution hardening and modulus hardening originating from the difference in modulus between Al and clusters.

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Citation

Starink, M.J., Gao, N., Davin, L., Yan, J. and Cerezo, A. (2005) Room temperature precipitation in quenched Al-Cu-Mg alloys: a model for the reaction kinetics and yield strength development Philosophical Magazine, 85, (13), pp. 1395-1417. (doi:10.1080/14786430412331333374).

More information

Published date: 2005
Keywords: precipitation, aluminium alloys, model, yield strength

Identifiers

Local EPrints ID: 19162
URI: http://eprints.soton.ac.uk/id/eprint/19162
ISSN: 1478-6435
PURE UUID: 826c7b64-37ed-4212-9f8a-e90eb207e4a6

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Date deposited: 16 Jan 2006
Last modified: 17 Jul 2017 16:33

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Contributors

Author: M.J. Starink
Author: N. Gao
Author: L. Davin
Author: J. Yan
Author: A. Cerezo

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