Investigation of Microstructure and Mechanical Behavior of Al/SiC/CNT Surface Composite Fabricated by Friction Stir Processing

Authors

1 Complex of Material and Manufacturing Technology, Malek Ashtar University, Tehran, Iran

2 Faculty of Materials Science and Engineering, K. N. Toosi University of Technology, Tehran, Iran

3 دانشجو،مجتمع مواد و فناوریهای ساخت، دانشگاه صنعتی مالک اشتر، تهران، ایران.

Abstract

Friction Stir Processing (FSP) can improve surface properties such as abrasion resistance, hardness, strength and formability without affecting the bulk properties of the material. In this study, surface nanocomposites were fabricated using Silicon Carbide (SiC) micro- and nano-size particles and carbon nanotubes (CNT) on 6061 aluminum substrate by the FSP method. For this purpose, the tool rotational speed of 1000 rpm, the feed rate of 35 mm/min, and the tool tilt angle of 3 degrees relative to the vertical axis were used. The microstructure, hardness and abrasion resistance of nanocomposite samples were studied. The results showed that the specimen containing of nano SiC had a more finer and homogenous distribution in the composite compared to specimen subjected to FSP without reinforcement. The results of the hardness test showed that performing FSP operation and adding reinforcing particles increased the hardness of the sample compared with the unreinforced sample. Moreover, the highest hardness rate was related to the sample containing SiC nanoparticles, which showed 185% improvement in comparison with the unreinforced sample. Furthermore, performing the FSP operation without adding reinforcing particles resulted in a 43% increase in hardness compared with the sample that had not gone through that operation. The results of the abrasion test showed an improvement in weight loss after the FPS operation and the addition of reinforcing particles. The highest abrasion resistance and the lowest coefficient of friction belonged to the sample containing SiC nanoparticles and CNT nanotubes, which indicated 81% lower weight loss than the unreinforced sample.

Keywords

References

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Journal of Solid and Fluid Mechanics
Volume 11, Issue 6
January and February 2022
Pages 219-233

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