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Low-Cycle Fatigue Behavior of Friction Stir-Welded Copper Joints

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Abstract

Investigation of the fatigue response of friction stir-welded (FSWed) joints is especially important in the design and manufacturing of components with exposure to cyclic loading. In this study, cyclic response of FSWed pure copper joints is investigated in the low-cycle fatigue regime. Microstructural characterizations revealed that FSW introduced a severely deformed microstructure in the nugget zone (NZ). Fatigue response was determined at a strain ratio of 0.1 by varying the total strain amplitude from 0.1 to 0.6%. Cyclic softening was observed for the low strain amplitude of 0.1%, whereas hardening was detected at higher strain amplitudes. The hysteresis loops demonstrated symmetricity along with noticeable linear behavior after the reversals. Typical fractures occurred in the heat affected zone (HAZ) rather than the NZ or the base metal due to grain coarsening of the HAZ. Improved cyclic properties of the NZ along with stable behavior up to 1000 cycles at a total strain amplitude of 0.3% were attributed to its fine and homogeneous microstructure. Moreover, fracture surface analysis demonstrated a ductile behavior represented by dimples in the sample strained at 0.1% in contrast with a brittle fracture surface of the sample fatigued at 0.5% strain amplitude.

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Acknowledgments

Support from Ozyegin University Research Fund is acknowledged.

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Authors and Affiliations

  1. Mechanical Engineering Department, Ozyegin University, Istanbul, Turkey

    Ali Hosseinzadeh, Salar Salahi, Amin Radi, Seyed Vahid Sajadifar & Guney Guven Yapici

  2. Mechanics and Manufacturing of Functional and Structural Materials Lab (MEMFIS), Ozyegin University, Istanbul, Turkey

    Ali Hosseinzadeh, Amin Radi & Guney Guven Yapici

  3. Institut für Werkstofftechnik (Materials Engineering), Universität Kassel, 34125, Kassel, Germany

    Seyed Vahid Sajadifar

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  1. Ali Hosseinzadeh
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Hosseinzadeh, A., Salahi, S., Radi, A. et al. Low-Cycle Fatigue Behavior of Friction Stir-Welded Copper Joints. J. of Materi Eng and Perform 30, 8643–8651 (2021). https://doi.org/10.1007/s11665-021-06034-2

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