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Synergistic effects of MWCNTs and high-pressure torsion-induced grain refinement on microhardness, tribological properties, and corrosion behavior of Cu and Cu/MWCNT nanocomposites

Akbarpour, M. R ; Sharif University of Technology | 2022

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  1. Type of Document: Article
  2. DOI: 10.1007/s12540-021-01112-5
  3. Publisher: Korean Institute of Metals and Materials , 2022
  4. Abstract:
  5. In this study, ultra-fine grained Cu and Cu + carbon nanotube (CNT) nanocomposites were prepared through a processes combining flake powder metallurgy, hot pressing, and high-pressure torsion (HPT). The effects of grain refinement and CNT reinforcement on the microstructure, hardness, wear resistance, and corrosion behavior of the newly developed nanocomposites were investigated. The results indicated that the HPT process decreased the grain size of Cu and Cu + CNT by 67.7% and 68.1%, respectively, and increased their microhardness by 151% and 132%. The addition of CNTs substantially improved the tribological behavior of Cu by generating a mechanically mixed carbon- and oxide-rich layer. Moreover, polarization and electrochemical impedance spectroscopy tests revealed that the CNTs have a negligible adverse effect on the corrosion resistance of the Cu + CNT nanocomposites. The influences of the processing route and CNTs are discussed. Graphic Abstract: [Figure not available: see fulltext.]. © 2021, The Korean Institute of Metals and Materials
  6. Keywords:
  7. Carbon nanotube (CNT) ; Corrosion ; High pressure torsion (HPT) ; Wear ; Copper ; Copper corrosion ; Corrosion resistance ; Corrosive effects ; Electrochemical corrosion ; Electrochemical impedance spectroscopy ; Grain refinement ; Grain size and shape ; Microhardness ; Nanocomposites ; Powder metallurgy ; Torsional stress ; Tribology ; Wear of materials ; Wear resistance ; Carbon nanotube ; Carbon nanotube nanocomposites ; Corrosion behaviour ; Grains refinement ; High pressure torsion ; High pressure torsions ; MWCNT's ; Synergistic effect ; Tribological properties ; Ultra-fines ; Carbon nanotubes
  8. Source: Metals and Materials International ; Volume 28, Issue 9 , 2022 , Pages 2197-2215 ; 15989623 (ISSN)
  9. URL: https://link.springer.com/article/10.1007/s12540-021-01112-5