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Reply to the comments on “Room-temperature precipitation in quenched Al-Cu-Mg alloys: a model for the reaction kinetics and yield-strength development”

Starink, M.J., Cerezo, A., Yan, J.L. and Gao, N. (2006) Reply to the comments on “Room-temperature precipitation in quenched Al-Cu-Mg alloys: a model for the reaction kinetics and yield-strength development” Philosophical Magazine, 86, (4), pp. 243-252. (doi:10.1080/09500830600678888).

Record type: Article

Abstract

Our recent work on Al-Cu-Mg-based alloys with Cu:Mg ratio close to unity showed that the rapid hardening at room temperature and the substantial heat evolution arising from the formation of Cu-Mg co-clusters. Here, it is shown that the measured enthalpy of formation of clusters (similar to 0.3 eV per Mg atom) is in reasonable agreement with expectations based on the similarity with Mg-vacancy clusters. The origin of the term GPB zones, as applied to the rapid hardening in Al-Cu-Mg-based alloys, is investigated. It is shown that current knowledge on the nanostucture and microstructure development during rapid hardening can be described without recourse to this alloy-specific term. Analysis of the kinetics of Cu-Mg co-clusters formation by DSC indicates that the formation of Cu-Mg co-cluster formation during a fast water quench can be sufficiently suppressed to cause substantial nucleation of co-clusters to occur in subsequent natural ageing and artificial ageing at low temperatures.

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Published date: 2006
Keywords: precipitation, Al-Cu-Mg, cluster, co-cluster, GPB zone, calorimetry, 3DAP, nucleation

Identifiers

Local EPrints ID: 39278
URI: http://eprints.soton.ac.uk/id/eprint/39278
ISSN: 1478-6435
PURE UUID: 5913a388-091d-4c7b-9a7a-d742984c59bb

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Date deposited: 26 Jun 2006
Last modified: 17 Jul 2017 15:37

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Contributors

Author: M.J. Starink
Author: A. Cerezo
Author: J.L. Yan
Author: N. Gao

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