Precipitation hardening in Al-Cu-Mg alloys: analysis of precipitates, modelling of kinetics, strength predictions


Starink, M.J. and Yan, J.L. (2006) Precipitation hardening in Al-Cu-Mg alloys: analysis of precipitates, modelling of kinetics, strength predictions. In, Poole, W.J., Wells, M.A. and Lloyd, D.J. (eds.) Aluminium Alloys 2006: Innovation Through Research and Technology. 10th International Conference on Aluminum Alloys Switzerland, Trans Tech, 251-258. (Materials Science Forum 519-521).

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Description/Abstract

In Al-Cu-Mg with compositions in the theta+S phase field, precipitation hardening is a two-stage process. Experimental evidence shows that the main precipitation sequence in alloys with Cu contents in excess of 1wt% is involves Cu-Mg co-clusters, GPBII/S'' and S. The first stage of the age hardening is due to the formation of Cu-Mg co-clusters, and the hardening can be modelled well by a modulus hardening mechanism. The appearance of the orthorhombic GPBII/S'' does not influence the hardness. The second stage of the hardening is due to the precipitation of S phase, which 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. The model is applied to a range of alloys with Cu:Mg ratios between 0.1 and 1 and to heat treatments ranging from room temperature ageing and artificial isothermal ageing to rapid heating to the solution treatment temperature. The predictive capabilities of this model are reviewed and its constitutive components are compared and contrasted with a range of other methods, such as the Kampmann-Wagner and JMAK models for precipitation as well as the LSW model for coarsening.

Item Type: Book Section
Additional Information: Series ISSN 0255-5476
ISBNs: 0878494081 (hardback)
ISSNs: 0255-5476 (print)
Related URLs:
Keywords: precipitation, co-clusters, strength, welding, ageing, S phase, coarsening
Subjects: T Technology > TN Mining engineering. Metallurgy
T Technology > TA Engineering (General). Civil engineering (General)
Divisions: University Structure - Pre August 2011 > School of Engineering Sciences > Engineering Materials & Surface Engineering
ePrint ID: 41229
Date Deposited: 03 Aug 2006
Last Modified: 27 Mar 2014 18:26
Publisher: Trans Tech
URI: http://eprints.soton.ac.uk/id/eprint/41229

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