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Microstructural aspects in Al–Cu dissimilar joining by FSW

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Abstract

Sound AA2024-T3–Cu10100 dissimilar joints were obtained by friction stir welding offsetting the tool probe towards the aluminum sheet and employing selected processing parameters. Joint microstructure was analyzed by means of conventional optic microscopy as well as scanning electron microscopy. The weld bead exhibited welding zones and some features typically encountered in similar FSW. The nugget zone consisted of a mixture of recrystallized aluminum matrix and deformed and twinned copper particles. Onion rings and particle-rich zones, made of Cu particles dispersed in the Al matrix, were also observed. EDS analysis revealed that several Al–Cu intermetallic compounds, such as Al2Cu, AlCu, and Al3Cu4, chemically different w.r.t. compounds precipitated during the T3 aging treatment (Al3Cu), were formed during the process. Microstructure variation significantly affects the microhardness distribution in the cross-section of the joint.

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Authors and Affiliations

  1. Department of Industrial Engineering, University of Salerno, Via Giovanni Paolo II 132, 84084, Fisciano, SA, Italy

    Pierpaolo Carlone & Gaetano S. Palazzo

  2. Department of Chemical, Materials and Industrial Production Engineering, University of Naples “Federico II”, P.le Tecchio 80, 80100, Naples, Italy

    Antonello Astarita, Valentino Paradiso & Antonino Squillace

Authors
  1. Pierpaolo Carlone
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  2. Antonello Astarita
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  3. Gaetano S. Palazzo
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  4. Valentino Paradiso
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  5. Antonino Squillace
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Correspondence to Pierpaolo Carlone.

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Carlone, P., Astarita, A., Palazzo, G.S. et al. Microstructural aspects in Al–Cu dissimilar joining by FSW. Int J Adv Manuf Technol 79, 1109–1116 (2015). https://doi.org/10.1007/s00170-015-6874-z

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  • DOI: https://doi.org/10.1007/s00170-015-6874-z

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