Texture evolution in AA6082-T6 BFSW welds: Optical microscopy and EBSD characterisation (2019)
© 2019 by the authors. One of the difficulties with bobbin friction stir welding (BFSW) has been the visualisation of microstructure, particularly grain boundaries, and this is especially problematic for materials with fine grain structure, such as AA6082-T6 aluminium as here. Welds of this material were examined using optical microscopy (OM) and electron backscatter diffraction (EBSD). Results show that the grain structures that form depend on a complex set of factors. The motion of the pin and shoulder features transports material around the weld, which induces shear. The shear deformation around the pin is non-uniform with a thermal and strain gradient across the weld, and hence the dynamic recrystallisation (DRX) processes are also variable, giving a range of observed polycrystalline and grain boundary structures. Partial DRX was observed at both hourglass boundaries, and full DRX at mid-stirring zone. The grain boundary mapping showed the formation of low-angle grain boundaries (LAGBs) at regions of high shear as a consequence of thermomechanical nature of the process.
CitationTamadon A, Pons DJ, Clucas D, Sued K (2019). Texture evolution in AA6082-T6 BFSW welds: Optical microscopy and EBSD characterisation. Materials. 12(19). 3215-3215.
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KeywordsAA6082-T6; bobbin friction stir welding; microstructure; optical microscopy; EBSD
ANZSRC Fields of Research40 - Engineering::4016 - Materials engineering::401607 - Metals and alloy materials
34 - Chemical sciences::3403 - Macromolecular and materials chemistry::340307 - Structure and dynamics of materials
40 - Engineering::4017 - Mechanical engineering::401707 - Solid mechanics
RightsAll rights reserved unless otherwise stated
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Flow-Based Anatomy of Bobbin Friction-Stirred Weld; AA6082-T6 Aluminium Plate and Analogue Plasticine Model Pons, Dirk; Tamadon, Abbas; Clucas, Don (MDPI AG, 2020)Material flow transportation around the rotating tool and the mass deposition at the backside of the tool are critical characteristics of friction stir welding. To achieve an optimized weld structure, the history of the ...
Tamadon A; Pons DJ; Clucas D; Sued K (MDPI AG, 2019)Bobbin friction stir welding with a double-sided tool configuration produces a symmetrical solid-state joint. However, control of the process parameters to achieve defect-free welds is difficult. The internal flow features ...
Tamadon, A.; Pons, D.J.; Sued, K.; Clucas, D. (2018): Bobbin friction stir welding (BFSW) is an innovative variant for the solid state welding process whereby a rotating symmetrical tool causes a fully penetrated bond. Despite the process development, there are still ...