Mixing mechanism in friction stir welding of metallic composites
- St-Georges L. ,
- Kiss L.I. and
- Dassylva-Raymond V.
- St-Georges L. ,
- Kiss L.I. and
- Dassylva-Raymond V.
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Numerical simulations and experimental tests were undertaken to visualise material flow and to study the effect of the flow field on the mixing mechanism and particle break-up in friction stir welding of metal matrix composites. A 3D thermo-fluid model was developed for the simulation, paying specific attention to the particle-matrix interactions. The influence of flow characteristics such as vorticity and shear strain on local mixing and break-up was estimated. Results were obtained for composites based on AA 6061-T6 alloys and welding performed under variable rotational speed (300-1200 rpm) and traverse speed (500-1250 mm/min). Issues discussed include the Rankine vortex shape of the velocity field and the effects of matrix properties, particle interactions and velocity field on particle break-up.
7th International Symposium, 20-22 May 2008, 7B: Microstructure 2, Paper 02
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