El Shalakany, Abou BakrM. Kamel, BahaaKhattab, A.Osman, T. A.Azzam, B.Zaki, M.2020-02-052020-02-052018[1] Kearney, A.; Rooy, E. L. ASM Handbook, ASM International, Metals Park, vol. 2, 123–151. 1990. [2] Vencl, A.; Bobic, I.; Arostegui, S.; Bobic, B. Aleksandar Marinkovi c, Miroslav Babi c“Structural, Mechanical and Tribological Properties of A356 Aluminum Alloy Reinforced with Al2O3, SiC and SiC C Graphite Particles”. J. All. Compound.. 2010, 506, 631–639. [3] Prassad, S. V.; Asthana, R. Aluminum Metal-Matrix Composites for Automotive Applications: Tribological Considerations. Tribol. Lett. 2004, 17, 445–52. [4] Kima, I.-Y.; Leea, J.-H.; Leea, G.-S.; Baika, S.-H.; Kimb, Y.-J.; Leea, Y.-Z. Friction and Wear Characteristics of the Carbon Nanotube– Aluminum Composites with Different Manufacturing Conditions. Wear. 2009, 267, 593–598. [5] Iijima, S. Helical Microtubules of Graphitic Carbon. Nature. 1991, 354, 56–58. [6] Wong, E. W.; Sheehan, P. E.; Liebert, C. M. Nanobeam Mechanics: Elasticity, Strength, and Toughness of Nanorods and Nanotubes. Science. 1997, 277, 1971–1975. [7] Zhou, S.; Zhang, X.; Ding, Z.; Min, C.; Xu, G.; Zhu, W. Fabrication and Tribological Properties of Carbon Nanotubes Reinforced Al Composites Prepared by Pressureless Infiltration Technique. Compos. Part A-Appl. S. 2007, 38, 301–306. [8] Kim, I.-Y.; Lee, J.-H.; Lee, G.-S.; Baik, S.-H.; Kim, Y.-J.; Lee, Y.-Z. Friction and Wear Characteristics of the Carbon Nanotube Aluminum Composites with Different Manufacturing Conditions. Wear. 2009, 267, 593–598. [9] Choi, H. J.; Lee, S. M.; Bae, D. H. Wear Characteristic of AluminumBased Composites Containing Multi-Walled Carbon Nanotubes. Wear. 2010, 270, 12–18. [10] Wang, Y. Q.; Afsar, A. M.; Jang, J. H.; Han, K. S.; Song, J. I. Room Temperature Dry and Lubricant Wear Behaviors of Al2O3f/SiCp/Al Hybrid Metal Matrix Composites. Wear. 2010, 268, 863–870. [11] Yilmaz, S. O. Comparison on Abrasive Wear of SiCrFe, CrFeC and Al2O3 Reinforced Al2024 MMCs. Tribol. Int. 2007, 40, 441–452. [12] Romanova, V. A.; Balokhonov, R. R.; Schmauder, S. The Influence of the Reinforcing Particle Shape and Interface Strength on the Fracture Behavior of a Metal Matrix Composite. Acta Mater. 2009, 57, 97–107. [13] Rosenberger, M. R.; Forlerer, E.; Schvezov, C. E. Wear Behavior of AA1060 Reinforced with Alumina Under Different Loads. Wear. 2009, 266, 356–359. [14] Bai, M. W.; Xue, Q. J.; Liu, W. M.; Yang, S. R. Wear Mechanisms of K2Ti4O9 Whiskers Reinforced Al–20Si Aluminum Matrix Composites with Lubrication of Water and Tetradecane. Wear. 1996, 199, 222–227. [15] Kim, S. J.; Chou, M. H.; Lim, D. S.; Jang, H. Synergistic Effects of Aramid Pulp and Potassium Titanate Whiskers in the Automotive Friction Material. Wear. 2001, 251, 1484–1491. [16] Miyajima, T.; Iwai, Y. Effects of Reinforcements on Sliding Wear Behavior of Aluminum Matrix Composites. Wear. 2003, 255, 606– 616. [17] Hanze, O. et al. Mechanical and Tribological Properties of AluminaMWCNTs Composites Sintered by Rapid Hot-Pressing. J. Eur. Ceram. Soc. 2017, 37, 4821–4831. [18] Singla, A. et al. Wear Properties of A356/Al2O3 Metal Matrix Composites Produced by Insitu Squeeze Casting Techniques. Nanotechnol. Ener. Water. 2017, 213–217. [19] Kamel, B. M.; Mohamed, A.; El Sherbiny, M.; Abed, K. A. Tribological Behaviour of Calcium Grease Containing Carbon Nanotubes Additives. J. Indus. Lubr. Tribol. 2016, 68, (6). [20] Kamel, B. M.; Mohamed, A.; El Sherbiny, M.; Abd-Rabou, M.; Abed, K. A. Tribological Properties of Synthesis Graphene Nanosheets as an Additive in Calcium Grease. J. Dispersion Sci. Technol. 2017,38, (10), 1495–1500. [21] Elshalakany, A. B.; Osman, T. A.; Khattab, A.; Azzam, B.; Zaki, M. Microstructure and Mechanical Properties of MWCNT’s Reinforced A356 Aluminum Alloys Cast Nanocomposites Fabricated by Using a Combination of Rheocasting and Squeeze Casting Techniques. J. Nanomater. Volume 2014, 1–14. 2014. [22] Jin-long, J.; Hai-Zhong, W.; Hua, Y.; Jin-Cheng, X. Fabrication and Wear Behavior of CNT/Al Composites. Trans. Nonferrous Met. Soc. China. 2007, 17, 113–116. [23] ASTM G40- 10 B Standard Terminology Relating to Wear and Erosion. [24] ASM Handbook: Friction, Lubrication and Wear Technology. ASM International. 1992, 18. [25] Lim, D. S.; You, D. H.; Choi, H.-J.; Lim, S. H.; Jang, H. Effect of CNT Distribution on Tribological Behavior of Alumina -CNT Composites. Wear. 2005, 259, 539–544. [26] Zhu, H.; Jar, C.; Song, J.; Zhao, J.; Li, J.; Xie, Z. High Temperature Dry Sliding Friction and Wear Behavior of Aluminum Matrix Composites (Al3ZrÞa-Al2O3) /Al. Tribol. Int. 2012, 48, 78–86. [27] Kato, H. Effects of Supply of Fine Oxide Particles onto Rubbing Steel Surfaces on Severe–Mild Wear Transition and Oxide Film Formation. Tribol. Int. 2008, 41, 735–742. [28] Kim, I.-Y.; Lee, J.-H.; Lee, G.-S.; Baik, S.-H.; Kim, Y.-J.; Leea, Y.-Z. Friction and Wear Characteristics of the Carbon Nanotube Aluminum Composites with Different Manufacturing Conditions. Wear. 2009, 267, 593–598. [29] Descartes, S.; Berthier, Y. Rheology and Flows of Solid Third Bodies: Background and Application to a MoS 1.6 Coating. Wear. 2002, 252, 46–56. [30] McI, C. H.; John, T.; Wong Kien, K. Measurements of Specific Energies for Erosive Wear using a Coriolis Erosion Tester. Wear. 2000, 241, 1–9.1536-383X (Print) 1536-4046 (Online)https://t.ly/y5vJbMSA Google ScholarThe objective of this paper is to investigate the effect of Multi-Walled Carbon Nanotubes (MWCNTs) content on microstructure and dry sliding wear behavior of hypo-eutectic A356Al–Si alloy Metal Matrix Nano-Composites (MMNCs). Composites containing 0.5, 1.5, and 2.5 wt.% MWCNTs were prepared by rheocasting technique followed by squeeze casting. Characterization of nanocomposites was done by scanning electron microscopy (SEM) equipped with energy dispersive X-ray analysis (EDX), dry sliding wear tests were performed in a pin-on-disk wear tester against a steel disk at various speeds and normal loads. Results revealed that a decrease in both wear rate and friction coefficient of the nanocomposites considerably with the increase of MWCNT’s content. The formation of the hard compact transfer layer on the pin surface nanocomposites assisted in increasing the wear resistance of these materials. It is that the transfer layer which was formed under an applied load of 20 N can act as a protective layer and help in reducing the wear rate. The results indicate the nano composites could be used in light-weight applications where moderate strength and wear properties are needed.enMetal Matrix Nano-Composites (MMNCs)MWCNTswear ratefriction coefficient, Al–Si alloysArticle