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Analysis of age hardening precipitates of Al-Zn-Mg-Cu alloys in a wide range of quenching rates using small angle X-ray scattering

Analysis of age hardening precipitates of Al-Zn-Mg-Cu alloys in a wide range of quenching rates using small angle X-ray scattering
Analysis of age hardening precipitates of Al-Zn-Mg-Cu alloys in a wide range of quenching rates using small angle X-ray scattering
The volume fraction of age hardening precipitates upon peak ageing after different quenching rates has been studied for five Al-Zn-Mg-Cu alloys using small angle X-ray scattering (SAXS) and transmission electron microscopy (TEM). The rate of change in volume fraction of the η′ age hardening precipitates as a function of cooling rate was used to evaluate changes in the degree of solute supersaturation, and hence the quench sensitivity of the Al-Zn-Mg-Cu alloys. The results demonstrate that the amount of η′ age hardening precipitates can be changed by varying the thermomechanical processing history or the alloy compositions. It was found that the volume fraction of age hardening η′ precipitates in Al-Zn-Mg-Cu alloys increases with increasing cooling rates and increasing Mg content as well as that the size of η′ precipitates is related to the Cu/Mg ratio.
Quench sensitivity, Small angle X-ray scattering, Age hardening precipitates, Volume fraction, Al-Zn-Mg-Cu alloys
0264-1275
259-267
Zhang, Yong
a398822e-74d7-424e-8efc-bf8307927312
Pelliccia, Daniele
3f60007e-4625-4f22-a344-4b3e085f5583
Milkereit, Benjamin
7fc4cf93-212a-4ba1-86d6-69934b194499
Kirby, Nigel
f096d265-c00e-42e0-8cd8-fb5ab470f513
Starink, Marco J.
fe61a323-4e0c-49c7-91f0-4450e1ec1e51
Rometsch, Paul A.
253485a3-d852-4c55-8be5-214383e1c1e2
Zhang, Yong
a398822e-74d7-424e-8efc-bf8307927312
Pelliccia, Daniele
3f60007e-4625-4f22-a344-4b3e085f5583
Milkereit, Benjamin
7fc4cf93-212a-4ba1-86d6-69934b194499
Kirby, Nigel
f096d265-c00e-42e0-8cd8-fb5ab470f513
Starink, Marco J.
fe61a323-4e0c-49c7-91f0-4450e1ec1e51
Rometsch, Paul A.
253485a3-d852-4c55-8be5-214383e1c1e2

Zhang, Yong, Pelliccia, Daniele, Milkereit, Benjamin, Kirby, Nigel, Starink, Marco J. and Rometsch, Paul A. (2018) Analysis of age hardening precipitates of Al-Zn-Mg-Cu alloys in a wide range of quenching rates using small angle X-ray scattering. Materials & Design, 142, 259-267. (doi:10.1016/j.matdes.2018.01.037).

Record type: Article

Abstract

The volume fraction of age hardening precipitates upon peak ageing after different quenching rates has been studied for five Al-Zn-Mg-Cu alloys using small angle X-ray scattering (SAXS) and transmission electron microscopy (TEM). The rate of change in volume fraction of the η′ age hardening precipitates as a function of cooling rate was used to evaluate changes in the degree of solute supersaturation, and hence the quench sensitivity of the Al-Zn-Mg-Cu alloys. The results demonstrate that the amount of η′ age hardening precipitates can be changed by varying the thermomechanical processing history or the alloy compositions. It was found that the volume fraction of age hardening η′ precipitates in Al-Zn-Mg-Cu alloys increases with increasing cooling rates and increasing Mg content as well as that the size of η′ precipitates is related to the Cu/Mg ratio.

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Y Zhang et al Mater Des 2018 - Accepted Manuscript
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More information

Accepted/In Press date: 18 January 2018
e-pub ahead of print date: 31 January 2018
Published date: 15 March 2018
Keywords: Quench sensitivity, Small angle X-ray scattering, Age hardening precipitates, Volume fraction, Al-Zn-Mg-Cu alloys

Identifiers

Local EPrints ID: 417602
URI: http://eprints.soton.ac.uk/id/eprint/417602
ISSN: 0264-1275
PURE UUID: 604c5dde-be6d-4ae4-bb54-8a063494fddb

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Date deposited: 07 Feb 2018 17:30
Last modified: 16 Mar 2024 06:12

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Contributors

Author: Yong Zhang
Author: Daniele Pelliccia
Author: Benjamin Milkereit
Author: Nigel Kirby
Author: Paul A. Rometsch

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