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Interfacial Microstructure and Mechanical Properties of Friction Stir Welded Joints of Commercially Pure Aluminum and 304 Stainless Steel

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Abstract

In the present investigation, friction stir welding of commercially pure aluminum and 304 stainless steel was carried out at varying tool rotational speeds from 200 to 1000 rpm in steps of 200 rpm using 60 mm/min traverse speed at 2 (degree) tool tilt angle. Microstructural characterization of the interfacial zone was carried out using optical microscope and scanning electron microscope. Energy-dispersive spectroscopy indicated the presence of FeAl3 intermetallic phase. Thickness of the intermetallic layer increased with the increase in tool rotational speed. X-ray diffraction studies indicated the formation of intermetallic phases like FeAl2, Fe4Al13, Fe2Al5, and FeAl3. A maximum tensile strength of ~ 90% that of aluminum along with ~ 4.5% elongation was achieved with the welded sample at tool rotational speed of 400 rpm. The stir zone showed higher hardness as compared to base metals, heat affected zone, and thermo-mechanically affected zone due to the presence of intermetallics. The maximum hardness value at the stir zone was achieved at 1000 rpm tool rotational speed.

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Authors and Affiliations

  1. Department of Metallurgy and Materials Engineering, Indian Institute of Engineering Science and Technology, Shibpur, Howrah, 711103, India

    Balamagendiravarman Murugan, Gopinath Thirunavukarasu, Sukumar Kundu & Subrata Chatterjee

  2. Department of Mechanical Engineering, Indian Institute of Science, Bengaluru, 560012, India

    Satish V. Kailas

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  1. Balamagendiravarman Murugan
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  2. Gopinath Thirunavukarasu
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  3. Sukumar Kundu
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  4. Satish V. Kailas
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  5. Subrata Chatterjee
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Correspondence to Sukumar Kundu.

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Murugan, B., Thirunavukarasu, G., Kundu, S. et al. Interfacial Microstructure and Mechanical Properties of Friction Stir Welded Joints of Commercially Pure Aluminum and 304 Stainless Steel. J. of Materi Eng and Perform 27, 2921–2931 (2018). https://doi.org/10.1007/s11665-018-3389-4

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  • DOI: https://doi.org/10.1007/s11665-018-3389-4

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