Paper Title:

A Multi-Mechanistic Model for Precipitation Strengthening in Al-Cu-Mg Alloys during Non-Isothermal Heat Treatments

Periodical Materials Science Forum (Volumes 519 - 521)
Main Theme Aluminium Alloys 2006 - ICAA10
Edited by W.J. Poole, M.A. Wells and D.J. Lloyd
Pages 277-282
DOI 10.4028/www.scientific.net/MSF.519-521.277
Citation I.N. Khan et al., 2006, Materials Science Forum, 519-521, 277
Online since July, 2006
Authors I.N. Khan, Marco J. Starink
Keywords AA2024 Aluminium Alloy, Modeling, Non-Isothermal, Precipitation Strengthening
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Abstract

A multi-mechanistic model for microstructure development and strengthening during nonisothermal treatment of precipitation strengthened Al-Cu-Mg based alloys is derived. The formation kinetics of the precipitates is modelled using the Kampmann and Wagner numerical model that accounts for complete transformation from the nucleation to the coarsening stages. The increase in critical resolved shear strength of the grains due to the precipitates is based on two mechanisms i.e. the modulus strengthening mechanism for the shearable Cu:Mg co-clusters and the Orowan strengthening mechanism for the non-shearable S phase precipitates. The contributions due to solute and dislocation strengthening are also included in the strength calculations. The model is verified by comparing the predicted results with differential scanning calorimetery and hardness data on 2024 aluminium alloys. The microstructural development and strength/hardness predictions of the model are in reasonable agreement with the experimental data and the differences are discussed in terms of requirements for further model development.