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Texture Evolution in AA6082-T6 BFSW Welds: Optical Microscopy and EBSD Characterisation.

Abbas Tamadon1, Dirk J Pons2, Don Clucas3

  • 1Department of Mechanical Engineering, University of Canterbury, Christchurch 8140, New Zealand. abbas.tamadon@pg.canterbury.ac.nz.

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Summary

Visualizing grain boundaries in bobbin friction stir welding (BFSW) of AA6082-T6 aluminum is challenging. This study reveals how material flow and thermomechanical conditions during BFSW influence microstructure and recrystallization, impacting grain structures.

Keywords:
AA6082-T6EBSDbobbin friction stir weldingmicrostructureoptical microscopy

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Area of Science:

  • Materials Science
  • Metallurgy
  • Manufacturing Processes

Background:

  • Bobbin friction stir welding (BFSW) presents challenges in visualizing microstructural features, especially grain boundaries.
  • Fine-grained materials like AA6082-T6 aluminum exacerbate these visualization difficulties.
  • Understanding microstructure is crucial for optimizing weld properties.

Purpose of the Study:

  • To investigate the microstructural evolution during bobbin friction stir welding of AA6082-T6 aluminum.
  • To correlate welding parameters and material flow with resulting grain structures and boundaries.
  • To enhance the understanding of dynamic recrystallization (DRX) in BFSW.

Main Methods:

  • Optical microscopy (OM) was employed for initial microstructural examination.
  • Electron backscatter diffraction (EBSD) was utilized for detailed grain boundary mapping.
  • Analysis focused on the influence of material transport and deformation gradients.

Main Results:

  • Observed variable polycrystalline and grain boundary structures due to complex material flow and non-uniform shear deformation.
  • Identified partial dynamic recrystallization (DRX) at hourglass boundaries and full DRX in the mid-stirring zone.
  • EBSD mapping revealed the formation of low-angle grain boundaries (LAGBs) in high-shear regions due to thermomechanical effects.

Conclusions:

  • The microstructure in BFSW welds is a result of intricate interactions between material flow, thermal gradients, and strain gradients.
  • Dynamic recrystallization (DRX) processes are spatially variable, leading to diverse microstructural features.
  • Thermomechanical conditions significantly influence grain boundary formation, with LAGBs forming under high shear stress.