University of Oulu

Nyanor, P., El-Kady, O., Yehia, H.M. et al. Effect of Carbon Nanotube (CNT) Content on the Hardness, Wear Resistance and Thermal Expansion of In-Situ Reduced Graphene Oxide (rGO)-Reinforced Aluminum Matrix Composites. Met. Mater. Int. 27, 1315–1326 (2021).

Effect of carbon nanotube (CNT) content on the hardness, wear resistance and thermal expansion of in-situ reduced graphene oxide (rGO)-reinforced aluminum matrix composites

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Author: Nyanor, Peter1; El‑Kady, Omayma2; Yehia, Hossam M.3;
Organizations: 1Department of Material Science and Engineering, Egypt-Japan University of Science and Technology, Alexandria, Egypt
2Powder Technology Division, Central Metallurgical Research and Development Institute, Cairo, Egypt
3Mechanical Engineering Department, Faculty of Industrial Education, Helwan University, Helwan, Egypt
4Kerttu Saalasti Institute, University of Oulu, Pajatie 5, 85500 Nivala, Finland
5Center for the Promotion of Interdisciplinary Education and Research, Kyoto University, Kyoto 615-8540, Japan
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 2.5 MB)
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Language: English
Published: Springer Nature, 2021
Publish Date: 2020-09-20


Aluminum matrix composites reinforced with reduced graphene oxide (rGO) and hybrid of carbon nanotube (CNT) and rGO are fabricated by solution coating powder metallurgy process. The hardness, wear resistance and coefficient of thermal expansion (CTE) of the reinforced aluminum composites and the associated microstructural changes with rGO range (0.2–0.6 wt%) and hybrids of 0.2 wt% CNT–rGO at different ratios have been investigated. The intensive microstructural observations show that rGO is adsorbed on Al particles and uniformly distributed in the Al matrix composites. The hardness values of the composites increase significantly with rGO reinforcement exhibiting the maximum hardness at 0.4 wt% rGO. Compared with the hybrid composites CNT–rGO/Al counterparts fabricated by the same route and wt. percent of 0.2, the hardness values in the hybrid CNT–rGO increase considerably. Similar to the hardness, the results of wear tests also exhibit corresponding variation in the values of the wear rates. The improvement in the wear resistance of the hybrid CNT–rGO /Al composite is pronounced in this work. Whereas the rGO reinforcements decrease significantly the wear rate of the aluminum-base by 98%, the wear resistance of the corresponding hybrid CNT–rGO is significantly higher than that of the preceding composites. Maximum CTE reduction of 28% was recorded for hybrid CNT–rGO (1:1) reinforced composite.

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Series: Metals and materials international
ISSN: 1598-9623
ISSN-E: 2005-4149
ISSN-L: 1598-9623
Volume: 27
Pages: 1315 - 1326
DOI: 10.1007/s12540-019-00445-6
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
Funding: One of the authors (Peter Nyanor) would like to show appreciation to the Japan International Cooporation Agency (JICA) for the support towards his Ph.D. program at Egypt-Japan University of Science and Technology (EJUST) and Powder Technology Division of Central Metallurgical Research and Development Institute (CMRDI), Cairo-Egypt.
Copyright information: © The Korean Institute of Metals and Materials 2019. This is a post-peer-review, pre-copyedit version of an article published in Metals and Materials International. The final authenticated version is available online at: