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<p>This study examines the impact of TiO₂ nanoparticles on the dissimilar joining of AA7071 aluminium and AZ31 magnesium alloys through Friction Stir Welding (FSW). By utilizing an innovative groove design on the faying surfaces, the integration of TiO₂ nanoparticles into the weld interface was successfully achieved, reducing their dissipation during the welding process. The optimal welding parameters, determined through experimentation, were rotational speeds of 1000&#xa0;rpm and travel speeds of 50&#xa0;mm/min. The microstructural evolution, nanoparticle distribution, and intermetallic compound (IMC) formation were greatly influenced by variations in heat input. The joint created using the optimal parameters demonstrated the highest tensile strength of 138&#xa0;MPa, almost twice as strong as the joint without nanoparticles. This improvement can be attributed to the refined microstructure, intermetallic compounds (IMCs), and the even distribution of nanoparticles in the stir zone. The microhardness achieved a value of 199&#xa0;HV. Most of the joints displayed brittle fractures, while a few also exhibited indications of ductile fracture. The results highlight the notable improvement in the mechanical properties of friction stir welded (FSW) joints between AA7071 and AZ31 due to the incorporation of TiO₂ nanoparticles.</p>

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Exploring the Effect of TiO₂ Nanoparticles on the Microstructural Dynamics and Mechanical Attributes of Dissimilar FSW Joints Between AA7071 and AZ31

  • 期刊论文

  • 发表日期：

    2025年1月24日

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  • K. Sabari,
  • A. Muniappan,
  • B. Deepanraj,
  • M. Yuvaperiyasamy

摘要

This study examines the impact of TiO₂ nanoparticles on the dissimilar joining of AA7071 aluminium and AZ31 magnesium alloys through Friction Stir Welding (FSW). By utilizing an innovative groove design on the faying surfaces, the integration of TiO₂ nanoparticles into the weld interface was successfully achieved, reducing their dissipation during the welding process. The optimal welding parameters, determined through experimentation, were rotational speeds of 1000 rpm and travel speeds of 50 mm/min. The microstructural evolution, nanoparticle distribution, and intermetallic compound (IMC) formation were greatly influenced by variations in heat input. The joint created using the optimal parameters demonstrated the highest tensile strength of 138 MPa, almost twice as strong as the joint without nanoparticles. This improvement can be attributed to the refined microstructure, intermetallic compounds (IMCs), and the even distribution of nanoparticles in the stir zone. The microhardness achieved a value of 199 HV. Most of the joints displayed brittle fractures, while a few also exhibited indications of ductile fracture. The results highlight the notable improvement in the mechanical properties of friction stir welded (FSW) joints between AA7071 and AZ31 due to the incorporation of TiO₂ nanoparticles.