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AFM Characterization of Stir-Induced Micro-Flow Features within the AA6082-T6 BFSW Welds

University of Canterbury, Department of Mechanical Engineering, Christchurch 8140, New Zealand
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Technologies 2019, 7(4), 80; https://doi.org/10.3390/technologies7040080
Received: 4 October 2019 / Revised: 5 November 2019 / Accepted: 6 November 2019 / Published: 7 November 2019
(This article belongs to the Special Issue Reviews and Advances in Materials Processing)
Bobbin Friction Stir Welding (BFSW) is a thermomechanical process containing severe plastic deformation by mechanical stirring and Dynamic Recrystallization (DRX) during recooling. Here we report the three-dimensional characteristics of the micro-flow patterns within the aluminium weld structure. The Surface topography observations by Atomic Force Microscopy (AFM) show the stirred-induced microstructural evolution where the rearrangement of dislocations at the sub-grain scale, and the subsequent High- and Low-Angle Grain Boundaries (HAGBs, LAGBs) exhibit specific alterations in grain size and morphology of the weld texture. The dislocations interaction in different regions of the weld structure also was observed in correlation to the thermomechanical behaviour of the BFSW process. These micro-flow observations within the weld breadth give a new insight into the thermomechanical characteristics of the FSW process during the stirring action where the plastic flow has a key role in the formation of the weld region distinct from the base metal. View Full-Text
Keywords: thermomechanical processing; bobbin friction stir welding; atomic force microscopy; AA6082-T6 aluminium alloy; dynamic recrystallization; precipitation thermomechanical processing; bobbin friction stir welding; atomic force microscopy; AA6082-T6 aluminium alloy; dynamic recrystallization; precipitation
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Tamadon, A.; Pons, D.J.; Clucas, D. AFM Characterization of Stir-Induced Micro-Flow Features within the AA6082-T6 BFSW Welds. Technologies 2019, 7, 80.

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