Reply to the comments on “Room-temperature precipitation in quenched Al-Cu-Mg alloys: a model for the reaction kinetics and yield-strength development”
Reply to the comments on “Room-temperature precipitation in quenched Al-Cu-Mg alloys: a model for the reaction kinetics and yield-strength development”
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.
precipitation, Al-Cu-Mg, cluster, co-cluster, GPB zone, calorimetry, 3DAP, nucleation
243-252
Starink, M.J.
fe61a323-4e0c-49c7-91f0-4450e1ec1e51
Cerezo, A.
2071e813-6bf2-4d2e-838d-33d0220f279f
Yan, J.L.
5f230a2d-0201-41fb-8469-e6c9a95c03b7
Gao, N.
9c1370f7-f4a9-4109-8a3a-4089b3baec21
2006
Starink, M.J.
fe61a323-4e0c-49c7-91f0-4450e1ec1e51
Cerezo, A.
2071e813-6bf2-4d2e-838d-33d0220f279f
Yan, J.L.
5f230a2d-0201-41fb-8469-e6c9a95c03b7
Gao, N.
9c1370f7-f4a9-4109-8a3a-4089b3baec21
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), .
(doi:10.1080/09500830600678888).
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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Starink_et_al_2006_Reply_to_Comments.pdf
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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: 16 Mar 2024 03:21
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Contributors
Author:
A. Cerezo
Author:
J.L. Yan
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