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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), pp. 4194-4207. (doi:10.1016/j.actamat.2012.04.032).

Record type: Article

Abstract

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.

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More information

e-pub ahead of print date: 18 May 2012
Published date: June 2012
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.
Keywords: natural ageing, nanostructure, modelling, thermodynamics, short range ordering
Organisations: Engineering Mats & Surface Engineerg Gp

Identifiers

Local EPrints ID: 337814
URI: http://eprints.soton.ac.uk/id/eprint/337814
ISSN: 1359-6454
PURE UUID: 558bcee2-6565-45ca-88f7-b7185a7f2754

Catalogue record

Date deposited: 03 May 2012 15:28
Last modified: 18 Jul 2017 06:01

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Contributors

Author: M.J. Starink
Author: L.F. Cao
Author: P.A. Rometsch

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