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 |
| Item ID: | 41237 |
| Date Deposited: | 07 Aug 2006 |
| Last Modified: | 28 Jun 2012 10:33 |
| Contributors: | Wang, S.C. (Author) Lefebvre, F. (Author) Yan, J.L. (Author) Sinclair, I. (Author) Starink, M.J. (Author) |
| Date: | 2006 |
| Status: | Published |
| Contact Email Address: | m.j.starink@soton.ac.uk |
| URI: | http://eprints.soton.ac.uk/id/eprint/41237 |
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