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Modelling Precipitate Evolution during Friction Stir Welding of Aerospace Aluminium Alloys

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Abstract:

Two models to predict the microstructural evolution and post-weld properties of friction stir welds in aerospace aluminium alloys are presented. The first model is a develop- ment of an existing semi-empirical method for the prediction of hardness profiles after welding, calibrated using isothermal hardness data. Post-weld natural ageing is accounted for, and a new method that predicts natural ageing kinetics is introduced. Once calibrated, the model is shown to accurately predict weld hardness profiles. However, this model does not explicitly predict the microstructure and therefore cannot readily be extended to model other properties. It can also only be applied to alloys welded in peak or overaged conditions. The second model aims to explicitly predict the heterogeneous precipitate distributions obtained after welding for any initial condition. It is based on classical kinetic theory and the numerical framework of Kampmann and Wagner. Multiple nucleation sites and multiple phases are accounted for. This model provides detailed microstructural information required for prediction of complex properties.

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Aluminium Alloys 2006 - ICAA10 View Preview

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Periodical:

Materials Science Forum (Volumes 519-521)

Pages:

1101-1106

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.519-521.1101

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Online since:

July 2006

Authors:

Joseph D. Robson, Nicolas Kamp, A. Sullivan, Hugh R. Shercliff

Keywords:

Aerospace Aluminum Alloys, Friction Stir Welding (FSW), Microstructural Modeling

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© 2006 Trans Tech Publications Ltd. All Rights Reserved

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References

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