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Influence of Interlayer Material on Softening and Wear Behavior of Friction Stir Welded AA6061-T6 alloy

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Abstract

In this investigation, Zn and brass interlayers were used for friction stir welding (FSW) of AA6061-T6 and investigated the weld joint’s microstructure, mechanical, and wear behavior. From microstructural analysis, it was observed that Zn dissolved in Al matrix at FSW process temperature and formed a solid solution. Brass particles distributed uniformly throughout the stir zone (SZ) formed a composite-like structure and intermetallic compounds (IMCs) such as Al2Cu and Al4Cu9. The grain size obtained for weld without interlayer, with Zn and brass interlayer, was 5.6 µm, 3.6 µm, and 2.3 µm, respectively. Hardness in SZ improved with brass interlayer. Marginal strength was enhanced for weld with Zn interlayer, and better strength was obtained with brass interlayer due to reduced softening and formation of IMCs than for weld without interlayer. The surface hardening mechanism reduced the wear rate for weld with brass interlayer.

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Authors and Affiliations

  1. Mechanical Engineering Department, B. V. Raju Institute of Technology, Narsapur, Telangana, 502313, India

    Korra Nagu

  2. Department of Mechanical Engineering, Anil Neerkonda Institute of Technology and Science, Visakhapatnam, Andhra Pradesh, 531162, India

    MVNV Satyanarayana

  3. Department of Mechanical Engineering, National Institute of Technology, Warangal, Telangana, 506004, India

    K. Harikrishna & Adepu Kumar

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  1. Korra Nagu
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  2. MVNV Satyanarayana
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  3. K. Harikrishna
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  4. Adepu Kumar
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Correspondence to Korra Nagu.

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Nagu, K., Satyanarayana, M., Harikrishna, K. et al. Influence of Interlayer Material on Softening and Wear Behavior of Friction Stir Welded AA6061-T6 alloy. Trans Indian Inst Met 76, 3347–3355 (2023). https://doi.org/10.1007/s12666-023-03007-y

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