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Effect of SiC and TiC nanoparticle reinforcement on the microstructure, microhardness, and tensile performance of AA6082-T6 friction stir welds

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Abstract

During the last decade, friction stir welding has various applications in the automotive, shipbuilding, and aerospace industry due to its versatility. More recently, there have been trials to combine FSW with ceramic nanoparticle reinforcement in order to form MMCs locally on the weld line. This combination could result to potential applications on the above industries. In the present study, optical and electron microscopy, as well as microhardness and tensile testing, were used in order to determine the effect that SiC and TiC nanopowders have on the weld nugget of AA6082-T6 butt welds. It is the first time that such a thorough study via TEM in combination with EDS was conducted for this alloy. Emphasis was given on the distribution of dislocations and on the presence of the intermetallic and reinforcing particles in the weld. It was found that the grain size of all the specimens was dramatically decreased due to the dynamic recrystallization phenomenon. This also provoked the dilution of a lot of the intermetallic particles of the base metal and the multiplication of the dislocations. Between the two reinforced specimens, the SiC presented higher elongation while the TiC presented higher microhardness.

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Acknowledgements

The authors would like to thank the R-Nano Laboratory of the School of Chemical Engineering of the National Technical University of Athens for providing the SiC and TiC nanopowders.

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Authors and Affiliations

  1. Shipbuilding Technology Laboratory, School of Naval Architecture and Marine Engineering, National Technical University of Athens, 9 Heroon Polytechniou st., Zografos, 157 80, Athens, Greece

    P. N. Karakizis & D. I. Pantelis

  2. Laboratory of Physical Metallurgy, School of Mining and Metallurgical Engineering, National Technical University of Athens, 9 Heroon Polytechneiou st., Zografos, 157 80, Athens, Greece

    G. Fourlaris & P. Tsakiridis

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  1. P. N. Karakizis
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  2. D. I. Pantelis
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  3. G. Fourlaris
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Correspondence to P. N. Karakizis.

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Karakizis, P.N., Pantelis, D.I., Fourlaris, G. et al. Effect of SiC and TiC nanoparticle reinforcement on the microstructure, microhardness, and tensile performance of AA6082-T6 friction stir welds. Int J Adv Manuf Technol 95, 3823–3837 (2018). https://doi.org/10.1007/s00170-017-1446-z

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  • DOI: https://doi.org/10.1007/s00170-017-1446-z

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