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

By S.C. Wang, F. Lefebvre, J.L. Yan, I. Sinclair and M.J. Starink

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

Topics: TJ, TN, TL
Year: 2006
OAI identifier: oai:eprints.soton.ac.uk:41237
Provided by: e-Prints Soton

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