Effects of carbon nanotube content on morphology of SiCp(CNT) hybrid reinforcement and tensile mechanical properties of
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In this work, the high-performance silicon carbide particle SiCp[carbon nanotube (CNT)] hybrid reinforcement is currently explored to develop the advanced metal matrix composites. 17 wt% SiCp(CNT)/Al composites were fabricated by a powder metallurgy technique, in which SiCp (CNT) hybrid reinforcement with various CNT contents (e.g., 3, 6 and 9 wt%) were applied. Effects of CNT content on the morphology of SiCp(CNT) hybrid reinforcement, the microstructural characteristics, and the tensile mechanical behavior of SiCp(CNT)/Al composites were studied as well. Especially, the SiCp(CNT)/Al composites with 6 wt% CNT in SiCp(CNT) hybrid reinforcement exhibited the most significant enhancing effects in the elastic modulus and tensile strength. Meanwhile, the SiCp(CNT)/Al composites produced a synergistic strengthening effect of SiCp and CNT compared to SiCp/Al composites, while the SiCp(CNT)/Al composites with high CNT content in SiCp(CNT) hybrid reinforcement provided weak improvement in the tensile strength and ductility due to the forming agglomeration of CNT in the matrix.
I. INTRODUCTION
Particle reinforced aluminum matrix composites (AMCs) are one of the effective alternatives in aerospace and automobile industries due to their excellent mechanical properties and their advantage of being machinable using conventional processing methods.1 Considering the characteristics of particle reinforced AMCs, the reinforcing materials have played a significant role in determining their whole performances. Therefore, conventional ceramic particles, such as silicon carbide particle (SiCp),2,3 alumina (Al2O3),4 and boron carbide (B4C),5,6 have been widely applied due to their excellent mechanical properties in the past decades. Although these ceramic particle reinforced AMCs already exhibited excellent enhancing effect on their tensile strength, the simultaneously improved tensile strength, toughness, and other properties of AMCs were difficult. To solve this problem, hybrid reinforcements composed of two or more reinforcements have attracted a great interest to some researchers. Oh and Han7 fabricated 6061Al matrix composites reinforced with Al2O3 short fibers and particles, respectively. They indicated that, in the Al2O3 short fiber/particle hybrid AMCs, the crack growth path was shifted due to the existence of short fiber and the toughness was enhanced. Iqbal et al.8 studied the initiation, interaction, and Contributing Editor: Jürgen Eckert Address all correspondence to these authors. a) e-mail: [email protected] b) e-mail: [email protected] DOI: 10.1557/jmr.2017.12
coalescence of fatigue micro-cracks in casting hybrid AMC reinforced with SiCp and Al2O3 whiskers. They found the similar result that both strength and toughness were improved by addition of hybrid reinforcements. On the other hand, many researchers9–12 have revealed that the addition of both hard particles (SiCp) and solid graphite lubricant particles improves the tribological properties of AMCs. The advantage of SiCp/graphite/Al composite is that they are self-lubri
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