Overview of recent work on precipitation in Al-Cu-Mg alloys

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, 775-782.


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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.

Item Type: Article
Additional Information: Series ISSN 0255-5476
ISBNs: 0878494324 (hardback)
ISSNs: 0255-5476 (print)
Related URLs:
Keywords: al-cu-mg alloys, clusters, precipitates, hardening
Subjects: T Technology > TN Mining engineering. Metallurgy
Divisions: University Structure - Pre August 2011 > School of Engineering Sciences > Engineering Materials & Surface Engineering
ePrint ID: 40868
Date Deposited: 12 Jul 2006
Last Modified: 27 Mar 2014 18:25
Contact Email Address: wangs@soton.ac.uk
URI: http://eprints.soton.ac.uk/id/eprint/40868

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