VPPA welds of Al-2024 alloys: analysis and modelling of local microstructure and strength


Wang, S.C., Lefebvre, F., Yan, J.L., Sinclair, I. and Starink, M.J. (2006) VPPA welds of Al-2024 alloys: analysis and modelling of local microstructure and strength. Materials Science and Engineering A, 431, (1-2), 123-136. (doi:10.1016/j.msea.2006.05.120).

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Description/Abstract

The microstructural features of variable polarity plasma arc welded Al-Cu-Mg 2024-T351 with 2319 filler have been studied by TEM, SEM and DSC. Fusion zone, partial melting zone, re-solutionising zone, overageing (for S phase), peak ageing (for S phase) and under ageing zones (for S phase) have been identified. The omega phase has been observed between re-solutionising zone and peak ageing zone. The hardness profile contains two peaks. The microstructure development, and resulting hardness and yield strength profiles are modelled using a model which combines primary precipitation, resolution, partial/full melting and resolidification (Scheil type) and re-precipitation, in a two precipitate – two mechanism approach. Hardness profiles and microstructures are accurately predicted. The hardness peak in the re-solutionising zone is due to re-solutionising and subsequent Cu-Mg co-cluster formation; and the second hardness peak is caused by S phase strengthening.

Item Type: Article
ISSNs: 0921-5093 (print)
Related URLs:
Keywords: Al-Cu-Mg alloy, microstructure modelling, TEM, DSC, co-clusters, hardness, VPPA weld, solidification
Subjects: T Technology > TJ Mechanical engineering and machinery
T Technology > TN Mining engineering. Metallurgy
T Technology > TL Motor vehicles. Aeronautics. Astronautics
Divisions: University Structure - Pre August 2011 > School of Engineering Sciences
University Structure - Pre August 2011 > School of Engineering Sciences > Engineering Materials & Surface Engineering
ePrint ID: 41237
Date Deposited: 07 Aug 2006
Last Modified: 15 Aug 2014 08:27
URI: http://eprints.soton.ac.uk/id/eprint/41237

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