Synergistic Effects of MWCNTs and High-Pressure Torsion-Induced Grain Refinement on Microhardness, Tribological Properties, and Corrosion Behavior of Cu and Cu/MWCNT Nanocomposites

• Published in: Metals and materials international Vol. 28; no. 9; pp. 2197 - 2215
• Main Authors: Akbarpour, M. R., Mirabad, H. Mousa, Golenji, R. Behjat, Kakaei, K., Kim, H. S.
• Format: Journal Article
• Language: English
• Published: Seoul The Korean Institute of Metals and Materials 01.09.2022; Springer Nature B.V; 대한금속·재료학회
• Subjects: Characterization and Evaluation of Materials; Chemistry and Materials Science; Copper; Corrosion effects; Corrosion resistance; Corrosive wear; Electrochemical impedance spectroscopy; Engineering Thermodynamics; Grain refinement; Grain size; Heat and Mass Transfer; High pressure; Hot pressing; Machines; Magnetic Materials; Magnetism; Manufacturing; Materials Science; Mechanical properties; Metallic Materials; Microhardness; Multi wall carbon nanotubes; Nanocomposites; Powder metallurgy; Pressure effects; Processes; Solid Mechanics; Synergistic effect; Tribology; Wear resistance; 재료공학; High pressure torsion (HPT); Carbon nanotube (CNT); Corrosion; Copper; Wear
• ISSN: 1598-9623; 2005-4149
• DOI: 10.1007/s12540-021-01112-5

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