Journal
ACTA MATERIALIA
Volume 60, Issue 10, Pages 4194-4207Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2012.04.032
Keywords
Natural ageing; Nanostructure; Modelling; Thermodynamics; Short range ordering
Funding
- Aluminium Corporation of China Ltd. (CHALCO)
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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-0.5 at.% Mg-1 at.% 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. (c) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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