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

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• 作者：M.J. Starink^a ; ^{m.j.starink@soton.ac.uk} ; L.F. Cao^b ; P.A. Rometsch^b
• 关键词：Natural ageing ; Nanostructure ; Modelling ; Thermodynamics ; Short range ordering
• 刊名：Acta Materialia
• 出版年：2012
• 期刊代码：1_13596454
• 类别：ms
• 出版时间：June, 2012
• 卷：60
• 期：10
• 页码：4194-4207
• 文件大小：1728 K

摘要

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.