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

An expanded model for the thermodynamics of co-clusters and their strengthening is presented and applied to predict co-cluster formation and strengthening in Al–Mg–Si alloys. The models were tested against data on a wide range of Al–Mg–Si alloys aged at room temperature. The strengthening due to co-...

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Bibliographic Details
Published in:Acta materialia 2012-06, Vol.60 (10), p.4194-4207
Main Authors: Starink, M.J., Cao, L.F., Rometsch, P.A.
Format: Article
Language:English
Subjects:
Alloys
Aluminum base alloys
Applied sciences
Atom probe analysis
Exact sciences and technology
Mathematical models
Metals. Metallurgy
Modelling
Nanostructure
Natural ageing
Short range ordering
Silicon
Strengthening
Thermodynamics
Three dimensional
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Summary:An expanded model for the thermodynamics of co-clusters and their strengthening is presented and applied to predict co-cluster formation and strengthening in Al–Mg–Si alloys. The models were tested against data on a wide range of Al–Mg–Si alloys aged at room temperature. The strengthening due to co-clusters is well predicted. The formation of co-clusters was 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.
ISSN:1359-6454
1873-2453
DOI:10.1016/j.actamat.2012.04.032