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    Texture evolution in AA6082-T6 BFSW welds: Optical microscopy and EBSD characterisation (2019)

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    Type of Content
    Journal Article
    UC Permalink
    https://hdl.handle.net/10092/102027
    
    Publisher's DOI/URI
    http://doi.org/10.3390/ma12193215
    
    Publisher
    MDPI AG
    ISSN
    1996-1944
    Language
    eng
    Collections
    • Engineering: Journal Articles [1529]
    Authors
    Sued K
    Pons, Dirk cc
    Tamadon, Abbas cc
    Clucas, Don cc
    show all
    Abstract

    © 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.

    Citation
    Tamadon 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.
    This citation is automatically generated and may be unreliable. Use as a guide only.
    Keywords
    AA6082-T6; bobbin friction stir welding; microstructure; optical microscopy; EBSD
    ANZSRC Fields of Research
    40 - 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
    Rights
    All rights reserved unless otherwise stated
    http://hdl.handle.net/10092/17651

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    • Internal Material Flow Layers in AA6082-T6 Butt-Joints during Bobbin Friction Stir Welding 

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      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 ...
    • Formation Mechanisms for Entry and Exit Defects in Bobbin Friction Stir Welding 

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      : 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 ...
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