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Predicting the quench sensitivity of Al-Zn-Mg-Cu alloys: a model for linear cooling and strengthening

Predicting the quench sensitivity of Al-Zn-Mg-Cu alloys: a model for linear cooling and strengthening
Predicting the quench sensitivity of Al-Zn-Mg-Cu alloys: a model for linear cooling and strengthening
In this work the quench sensitivity of Al-Zn-Mg-Cu alloys is studied through continuous cooling at constant rates of a range of alloys using differential scanning calorimetry (DSC), transmission electron microscopy (TEM), scanning electron microscopy (SEM) and hardness testing. The DSC, TEM and SEM data show that the cooling reactions are dominated by a high temperature reaction (typically ~450 °C down to ~350 °C) due mostly to S-Al2CuMg phase formation, a medium temperature reaction (~350 °C down to ~250 °C) due predominantly to ?-Mg(Al,Cu,Zn)2 phase formation and a lower temperature reaction (~250 °C down to ~150 °C) due to a Zn-Cu rich thin plate phase. A new, physically-based model is constructed to predict rates of all reactions, enthalpy changes and resulting yield strength in the artificially aged condition. The model incorporates a recently derived model for diffusion-controlled reactions based on the extended volume fraction concept as well as recent findings from first principles modelling of enthalpies of the relevant phases. The model shows a near perfect correspondence with data on all 6 alloys studied extensively by cooling DSC and hardness testing, and allows prediction of the influence of the 3 major elements and 3 dispersoid forming elements on quench sensitivity.
0261-3069
958-971
Starink, M.J.
fe61a323-4e0c-49c7-91f0-4450e1ec1e51
Milkereit, B.
2b55bc26-041b-4e10-bd14-cc7b4519e72e
Zhang, Y.
c6568601-0e54-46d9-996e-564abd37fb83
Rometsch, P.A.
d42d9026-717d-4374-a7f3-ca8d3192363b
Starink, M.J.
fe61a323-4e0c-49c7-91f0-4450e1ec1e51
Milkereit, B.
2b55bc26-041b-4e10-bd14-cc7b4519e72e
Zhang, Y.
c6568601-0e54-46d9-996e-564abd37fb83
Rometsch, P.A.
d42d9026-717d-4374-a7f3-ca8d3192363b

Starink, M.J., Milkereit, B., Zhang, Y. and Rometsch, P.A. (2015) Predicting the quench sensitivity of Al-Zn-Mg-Cu alloys: a model for linear cooling and strengthening. Materials & Design, 88, 958-971. (doi:10.1016/j.matdes.2015.09.058).

Record type: Article

Abstract

In this work the quench sensitivity of Al-Zn-Mg-Cu alloys is studied through continuous cooling at constant rates of a range of alloys using differential scanning calorimetry (DSC), transmission electron microscopy (TEM), scanning electron microscopy (SEM) and hardness testing. The DSC, TEM and SEM data show that the cooling reactions are dominated by a high temperature reaction (typically ~450 °C down to ~350 °C) due mostly to S-Al2CuMg phase formation, a medium temperature reaction (~350 °C down to ~250 °C) due predominantly to ?-Mg(Al,Cu,Zn)2 phase formation and a lower temperature reaction (~250 °C down to ~150 °C) due to a Zn-Cu rich thin plate phase. A new, physically-based model is constructed to predict rates of all reactions, enthalpy changes and resulting yield strength in the artificially aged condition. The model incorporates a recently derived model for diffusion-controlled reactions based on the extended volume fraction concept as well as recent findings from first principles modelling of enthalpies of the relevant phases. The model shows a near perfect correspondence with data on all 6 alloys studied extensively by cooling DSC and hardness testing, and allows prediction of the influence of the 3 major elements and 3 dispersoid forming elements on quench sensitivity.

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e-pub ahead of print date: 14 September 2015
Published date: 25 December 2015
Organisations: Engineering Mats & Surface Engineerg Gp

Identifiers

Local EPrints ID: 380208
URI: http://eprints.soton.ac.uk/id/eprint/380208
ISSN: 0261-3069
PURE UUID: b126d4c9-3b77-44cd-a14c-d07079c66eb1

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Date deposited: 20 Aug 2015 15:40
Last modified: 25 Nov 2021 19:59

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Contributors

Author: M.J. Starink
Author: B. Milkereit
Author: Y. Zhang
Author: P.A. Rometsch

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