Microstructural evolution during friction stir welding of AA7449
- Robson J.D. ,
- Sullivan A. ,
- Shercliff H.R. ,
- et al
- Robson J.D. ,
- Sullivan A. ,
- Shercliff H.R. and
- McShane G.
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Variations in microstructure in friction stir welds in AA 7449 (Al, 2.2%Mg, 8.2%Zn, 1.7%Cu, 0.12%Si, 0.15%Fe, 0.2%Mn, 0.05%Cr, 0.25 T plus Zr) in the initially overaged (T7) condition were studied. Isothermal heat treatments were conducted at 350 and 440 deg.C with hold times of 1 min, 10 mins, 1 h and 5 h. The microstructure of the samples was examined by SEM and TEM. Microhardness was determined. Models were developed to predict the hardness profile and microstructural evolution during friction stir welding (FSW). The hardness model was based on a semi-empirical method, which required calibration with isothermal heat treatment data. A thermal model was used to predict the temperature evolution during welding. The microstructural model was based on the Kampmann and Wagner Numerical (KWN) model. Predicted and experimental results were compared.
5th International Symposium, 14-16 Sep 2004, Session 8B: Metallurgy/Microstructure, Paper 03
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