A model for precipitation kinetics and hardening in Al-Cu-Mg alloys

Khan, I.N., Starink, M.J. and Yan, J.L. (2008) A model for precipitation kinetics and hardening in Al-Cu-Mg alloys. Materials Science and Engineering: A, 472 (1-2), 66-74. (doi:10.1016/j.msea.2007.03.033).

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Abstract

A physically-based numerical model is developed to predict the microstructural evolution and strengthening in Al Cu Mg alloys during isothermal treatments. The modelling of the formation kinetics of the precipitates is based on the Kampmann and Wagner model. The strengthening by the shearable Cu:Mg co clusters is modelled on the basis of modulus strengthening mechanism and the strengthening by the non-shearable S phase precipitates is based on the Orowan looping mechanism. The model predictions are verified by comparing with the strength and differential isothermal calorimetery data on 2024-T351 aluminium alloys. The microstructural development and strength predictions of the model are generally in good agreement with the experimental data.

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e-pub ahead of print date: 19 March 2007

Published date: 15 January 2008

Keywords: aluminium alloys, ageing, modelling, precipitation kinetics, co-clusters, calorimetry, TEM, S phase, strengthening, 2024, aerospace alloys, coarsening, modulus hardening

Organisations: Engineering Mats & Surface Engineerg Gp