Effect of Bimodal-Sized Hybrid TiC–CNT Reinforcement on the Mechanical Properties and Coefficient of Thermal Expansion of Aluminium Matrix Composites

Peter Nyanor; Omayma El‑Kady; Hossam M. Yehia; Atef S. Hamada; Mohsen A. Hassan

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자료유형: 학술저널

저자정보: Peter Nyanor (Egypt-Japan University of Science and Technology) Omayma El‑Kady (Central Metallurgical Research and Development Institute (CMRDI)) Hossam M. Yehia (Helwan University) Atef S. Hamada (University of Oulu) Mohsen A. Hassan (Egypt-Japan University of Science and Technology)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.27 No.4

발행연도: 2021.1

수록면: 753 - 766 (14page)

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Aluminium (Al) matrix reinforced with carbon nanotubes (CNT), micron-sized titanium carbide (TiC) particles, and bimodal(nano + micron) hybrid TiC–CNT is fabricated by solution ball milling, followed by cold compaction and vacuum sinteringto improve the mechanical properties and reduce thermal expansion. The hardness, wear resistance, compressive strength andCTE of pure Al, 0.6 wt% CNT/Al, 10 wt% TiC/Al, and hybrid 10–0.6 wt% TiC–CNT/Al composites have been investigated inthis work. Analysis of strengthening mechanisms based on theoretical models, microstructure, and properties of constituentmaterials is performed. Microstructure analysis reveals an excellent distribution of the reinforcement phase and no new phaseformation in sintered composites. The hardness value of bimodal TiC–CNT reinforced Al composite is significantly higherthan monomodal TiC reinforced composite, reaching 2.3 times the hardness value of pure Al. Similarly, the wear resistanceimproved, and CTE reduced with CNT and TiC addition but is even significantly better in the hybrid reinforced composite. Experimental values of CTE show good agreement with the theoretical model. The strength and ductility of materials aremutually exclusive, but the compressive strength of pure Al has been doubled without significant loss in ductility throughthe use of bimodal-sized hybrid TiC–CNT reinforcement in this work.

#Aluminium metal matrix composites · Powder metallurgy · Solution ball milling · Titanium carbide–carbon nanotubes · Bimodal-sized reinforcement · Mechanical properties

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