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This paper investigates the impact of reinforcing particles silicon carbide (SiC) and zinc (Zn) on the 6061-T6 aluminium alloy matrix during friction stir welding. Optical Microscopic (OM) images of the weld specimens revealed defect-free, uniformly mixed surfaces when Zn powder was added to the aluminium matrix. Due to its lower melting temperature compared to SiC powder particles and AA6061-T6, the Zn particles are melted and mixed with the aluminium matrix during welding, while the high melting temperature of SiC powder particles causes them to diffuse and mix with the aluminium matrix. The maximum tensile strengths for the Zn- and SiC-reinforced welded samples were 235 MPa and 225 MPa, respectively, with corresponding maximum hardness values of 140 HV0.2 and 120 HV0.2. Furthermore, the field emission scanning electron microscope (FE-SEM) equipped with energy dispersive spectroscopy (EDS) was utilized for elemental mapping of the stir zone area in Zn- and SiC-reinforced samples, respectively, providing additional insights into the distribution of Zn and SiC powder particles within the welds.

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Effect of SiC and Zn Powder Particles Reinforcement on the Microstructural and Mechanical Properties During Friction Stir Welding of 6061-T6 Aluminium Alloy

  • 会议论文

  • 发表日期：

    2026年

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  • Rahul Kesharwani,
  • Kishor Kumar Jha,
  • Murshid Imam,
  • Chiranjit Sarkar

摘要

This paper investigates the impact of reinforcing particles silicon carbide (SiC) and zinc (Zn) on the 6061-T6 aluminium alloy matrix during friction stir welding. Optical Microscopic (OM) images of the weld specimens revealed defect-free, uniformly mixed surfaces when Zn powder was added to the aluminium matrix. Due to its lower melting temperature compared to SiC powder particles and AA6061-T6, the Zn particles are melted and mixed with the aluminium matrix during welding, while the high melting temperature of SiC powder particles causes them to diffuse and mix with the aluminium matrix. The maximum tensile strengths for the Zn- and SiC-reinforced welded samples were 235 MPa and 225 MPa, respectively, with corresponding maximum hardness values of 140 HV0.2 and 120 HV0.2. Furthermore, the field emission scanning electron microscope (FE-SEM) equipped with energy dispersive spectroscopy (EDS) was utilized for elemental mapping of the stir zone area in Zn- and SiC-reinforced samples, respectively, providing additional insights into the distribution of Zn and SiC powder particles within the welds.