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Karim Kakaei

Karim Kakaei

Academic rank: Professor
ORCID:
Education: PhD.
ScopusId:
HIndex:
Faculty: 1
Address:
Phone: 37220475

Research

Title
Synergistic Effects of MWCNTs and High-Pressure Torsion-Induced Grain Refinement on Microhardness, Tribological Properties, and Corrosion Behavior of Cu and Cu/MWCNT Nanocomposites
Type
JournalPaper
Keywords
High pressure torsion (HPT) · Copper · Carbon nanotube (CNT) · Wear · Corrosion
Year
2022
Journal METALS AND MATERIALS INTERNATIONAL
DOI
Researchers Mohammad Reza Akbarpour ، ، ، Karim Kakaei ،

Abstract

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.