Mechanical, tribological, and electrochemical behavior of hybrid aluminum matrix composite containing boron carbide (B 4
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Department of Physics, International Islamic University, Islamabad, Pakistan Materials Division, Pakistan Institute of Nuclear Science and Technology (PINSTECH), Nilore, Islamabad, Pakistan Department of Materials Science and Engineering, Institute of Space Technology, Islamabad, Pakistan 4 Department of Physics, Riphah International University, Islamabad, Pakistan 5 Physics Division, Pakistan Institute of Nuclear Science and Technology (PINSTECH), Islamabad 45650, Pakistan a) Address all correspondence to this author. e-mail: rafi[email protected], rafi[email protected] 2 3
Received: 7 February 2019; accepted: 15 July 2019
In the present work, mechanical, tribological, and electrochemical behaviors of Al Alloy 6061–(0–10) % B4C–(0.25–1.2) % graphene nanoplatelets (GNPs) composites, prepared by a combination of solution mixing and powder metallurgy, were investigated. Properties such as hardness, compressive strength, wear rates, and coefficient of friction (COF) were used to investigate the effects of GNPs on mechanical and selflubricating tribological behavior. The corrosion resistance of composites was investigated using potentiodynamic polarization and electrochemical impedance techniques. Scanning electron microscopy, energy-dispersive X-ray spectroscopy (EDS), and EDS mapping were employed to study the distribution, the fracture profile, and wear mechanism. The AA 6061–10% B4C–0.6% GNPs composites exhibited sharp increase in hardness and compressive strength and significant decrease in wear rates and COF. However, for GNPs contents exceeding over 0.6 wt%, mechanical properties and wear performances deteriorated. Pulling out of sheared pultruded GNPs was observed during the fracture of composites. Worn surfaces of GNPs-containing composites showed the smeared graphene layer with some macro-cracks exhibiting delamination wear. It was found that the corrosion inhibition efficiency of GNPs was more pronounced in H3BO3 environment than in NaCl solution.
Introduction Aluminum matrix composites (AMCs), a class of metal matrix composites (MMCs), exhibit excellent physical and mechanical properties, such as high specific strength, low coefficient of expansion, and better tribological properties, rendering these materials very promising for various structural applications in automotive, aerospace, and electronic equipment industries and other manufacturing industries [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]. AMCs reinforced with ceramic/carbonaceous phases have attracted great interests owing to the combined effects of metallic and ceramic/carbonaceous materials [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]. Typically employed reinforcements are silicon carbide (SiC), boron carbide (B4C), aluminum oxide (Al2O3),
ª Materials Research Society 2019
titanium carbide (TiC), aluminum nitride (AlN), intermetallic quasicrystals, carbon fibers, carbon nanotubes (CNTs), and graphene nanoplatelets (GNPs) [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16]. Among individually reinforced particles in AMCs, boron carbide (B4C) exhibits the unique combinati
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