Effect of Multiwalled Carbon Nanotubes on Elevated Temperature Tensile and Wear Behavior of Al2024 Matrix Composites Fab
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JMEPEG https://doi.org/10.1007/s11665-020-05032-0
Effect of Multiwalled Carbon Nanotubes on Elevated Temperature Tensile and Wear Behavior of Al2024 Matrix Composites Fabricated by Stir Casting and Hot Extrusion Muhammet Emre Turan, Muhammad Rashad, Huseyin Zengin, Ismail Topcu, Yavuz Sun, and Muhammad Asif (Submitted April 10, 2020; in revised form June 17, 2020) In this study, aluminum alloy matrix composites reinforced with MWCNT particles by 0.5 wt.% were fabricated by a new developed technique, consisting of semi-powder metallurgy and stir casting processes. Then, hot extrusion process was applied to the composite materials. Phase analysis and microstructure investigations were performed for the as-cast and extruded samples. Hardness test was conducted, and tensile tests were applied at room, 150 and 250 °C. The tribological performances of unreinforced alloy and MWCNT-reinforced composite were examined at room, 150 and 250 °C as well. The results showed that hardness of base aluminum alloy was improved. The peaks belonging to the MWCNT were detected by xray diffraction (XRD) analysis. The incorporation of MWCNT presents strengthening effect on the mechanical properties at all test temperatures. The wear rate generally decreased with the addition of MWCNT for all test conditions. Extrusion process had a positive effect to enhance wear and hardness behavior. Abrasive, adhesive, oxidative and thermal wear mechanisms were observed by scanning electron microscope. Keywords
MWCNT, aluminum alloy, extrusion, tensile, wear
1. Introduction 2024 Aluminum alloy (Al2024) has great attention in aerospace and automobile sectors due to its low density. Al2024 is known as a heat treatable alloy in addition to its high stiffness and strength properties (Ref 1). Researchers generally try using this alloy as a matrix to develop high-strength composite materials in order to meet the demands of industry. Carbon nanotubes (CNTs) have become popular reinforcement for metal matrix composites because of their superior thermal, electrical and mechanical performance. They have 1 TPa elastic modulus and 30-100 GPa strength values (Ref 2). CNTs are lightweight and have large aspect ratio. When CNTs are incorporated to the matrix material, they generally lead to the enhancement of mechanical and thermal properties significantly (Ref 1-3). The main challenge is to obtain homogenously CNTs distributed composites due to the strong van der Waals attraction energy between carbon atoms (Ref 3, 4). For this purpose, different production techniques have been used so far. In general, powder metallurgy method allows to attain highMuhammet Emre Turan, Huseyin Zengin, and Yavuz Sun, Metallurgical and Material Science Engineering Department, Karabuk University, 78050 Karabuk, Turkey; Muhammad Rashad, School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China; Ismail Topcu, Metallurgical and Material Science Engineering Department, Alanya Alaaddin Keykubat University, 07450 Antalya, Turkey; Muha
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