A model for the thermodynamics of and strengthening due to co-clusters in Al-Mg-Si based alloys

Starink, M.J., Cao, L.F. and Rometsch, P.A. (2012) A model for the thermodynamics of and strengthening due to co-clusters in Al-Mg-Si based alloys. Acta Materialia, 60, (10), 4194-4207. (doi:10.1016/j.actamat.2012.04.032).


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An expanded model for the thermodynamics of co-clusters and their strengthening is presented, and the model is applied to predict co-cluster formation and strengthening in Al-Mg-Si alloys. The models are tested against data on a wide range of Al-Mg-Si alloys aged at room temperature. The strengthening due to co-clusters is predicted well. The formation of the co-clusters is studied in an Al-0.5at%Mg-1at%Si alloy using three-dimensional atom probe analysis. The results correspond well with the model. It is shown that in general, (short-range) order strengthening due to co-clusters will be the main strengthening mechanism in these alloys. Apart from the co-clusters, Si clusters also form, but due to their low enthalpy of formation, they contribute little to the strength.

Item Type: Article
Digital Object Identifier (DOI): doi:10.1016/j.actamat.2012.04.032
Additional Information: Acknowledgements: Dr. Zhihua Zhu is gratefully acknowledged for additional tensile testing and additional EDS analyses. Dr. Dacian Tomus is thanked for providing Fig. 11. Helpful discussions with Dr. Malcolm Couper are also gratefully acknowledged. In addition, the authors would like to thank the Aluminium Corporation of China Ltd. (CHALCO) for providing the Al–0.5Mg–1Si alloy and supporting some aspects of this work financially. Use of the 3DAP facilities at the Monash Centre for Electron Microscopy is also gratefully acknowledged.
ISSNs: 1359-6454 (print)
Keywords: natural ageing, nanostructure, modelling, thermodynamics, short range ordering
Subjects: T Technology > TN Mining engineering. Metallurgy
Divisions : Faculty of Engineering and the Environment > Engineering Sciences > Engineering Materials Surface Engineering
ePrint ID: 337814
Accepted Date and Publication Date:
June 2012Published
18 May 2012Made publicly available
Date Deposited: 03 May 2012 15:28
Last Modified: 31 Mar 2016 14:27
URI: http://eprints.soton.ac.uk/id/eprint/337814

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