Overview of recent work on precipitation in Al-Cu-Mg alloys
Overview of recent work on precipitation in Al-Cu-Mg alloys
Recent work on Al-Cu-Mg based alloys with Cu:Mg atomic ratio close to unity is reviewed to clarify the mechanisms for age hardening. During the first stage of hardening a substantial exothermic heat evolution occurs whilst the microstructural change involves the formation of initially Cu-rich / Mg-rich clusters and later Cu-Mg co-clusters. The data show that the first stage of the age hardening is due to the formation of Cu-Mg co-clusters. The combined experimental methods show the second stage hardening is dominated by formation of S phase, which forms a dense precipitation at the peak hardness stage, whilst no significant amounts of other phases or zones are detected. S phase strengthens the alloy predominantly through the Orowan looping mechanism. These findings are incorporated into a multi-phase, multi-mechanism model for yield strength of Al-Cu-Mg based alloys.
al-cu-mg alloys, clusters, precipitates, hardening
0878494324
775-782
Wang, S.C.
8a390e2d-6552-4c7c-a88f-25bf9d6986a6
Starink, M.J.
fe61a323-4e0c-49c7-91f0-4450e1ec1e51
Gao, N.
9c1370f7-f4a9-4109-8a3a-4089b3baec21
2007
Wang, S.C.
8a390e2d-6552-4c7c-a88f-25bf9d6986a6
Starink, M.J.
fe61a323-4e0c-49c7-91f0-4450e1ec1e51
Gao, N.
9c1370f7-f4a9-4109-8a3a-4089b3baec21
Wang, S.C., Starink, M.J. and Gao, N.
(2007)
Overview of recent work on precipitation in Al-Cu-Mg alloys.
Materials Science Forum, 546-549, .
Abstract
Recent work on Al-Cu-Mg based alloys with Cu:Mg atomic ratio close to unity is reviewed to clarify the mechanisms for age hardening. During the first stage of hardening a substantial exothermic heat evolution occurs whilst the microstructural change involves the formation of initially Cu-rich / Mg-rich clusters and later Cu-Mg co-clusters. The data show that the first stage of the age hardening is due to the formation of Cu-Mg co-clusters. The combined experimental methods show the second stage hardening is dominated by formation of S phase, which forms a dense precipitation at the peak hardness stage, whilst no significant amounts of other phases or zones are detected. S phase strengthens the alloy predominantly through the Orowan looping mechanism. These findings are incorporated into a multi-phase, multi-mechanism model for yield strength of Al-Cu-Mg based alloys.
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MSF-2006BIMW.pdf
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More information
Published date: 2007
Additional Information:
Series ISSN 0255-5476
Keywords:
al-cu-mg alloys, clusters, precipitates, hardening
Organisations:
Engineering Mats & Surface Engineerg Gp
Identifiers
Local EPrints ID: 40868
URI: http://eprints.soton.ac.uk/id/eprint/40868
ISBN: 0878494324
ISSN: 1662-9752
PURE UUID: a0e90e20-1187-4360-ac2e-2154905d1ca7
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Date deposited: 12 Jul 2006
Last modified: 16 Mar 2024 03:21
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