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


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), 1395-1417. (doi:10.1080/14786430412331333374).

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Description/Abstract

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.

Item Type: Article
ISSNs: 1478-6435 (print)
Related URLs:
Keywords: precipitation, aluminium alloys, model, yield strength
Subjects: T Technology > TN Mining engineering. Metallurgy
Q Science > QC Physics
Divisions: University Structure - Pre August 2011 > School of Engineering Sciences
ePrint ID: 19162
Date Deposited: 16 Jan 2006
Last Modified: 27 Mar 2014 18:08
URI: http://eprints.soton.ac.uk/id/eprint/19162

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