TRIBOLOGICAL AND ELECTROCHEMICAL BEHAVIOR OF GRAPHENE, CNT, AND BN REINFORCED AA5083 ALUMINUM MATRIX COMPOSITES

Document Type : Original Article

Authors

1 Mechanical and Mechatronics Engineering Department, Higher Technological Institute, Tenth of Ramadan City 44637.

2 Benha National University, EGYPT.

Abstract

This study investigates the influence of nano-scale reinforcements carbon nanotubes (CNTs), hexagonal boron nitride (h-BN), and graphene on the mechanical, tribological, and corrosion-resistant properties of AA5083 aluminum alloy composites. Single- and hybrid-reinforced composites were fabricated using Friction Stir Processing (FSP), and their performance was evaluated through microstructural analysis, microhardness testing, wear rate assessment, and electrochemical corrosion studies. Microstructural characterization revealed a uniform dispersion of reinforcements, particularly in hybrid combinations, resulting in significant grain refinement and enhanced mechanical properties. Among single-reinforced composites, graphene demonstrated the lowest wear rate (0.14 mm³/m) and corrosion rate (0.0127 mm/y), while BN showed the highest hardness improvement (78 HV). Hybrid composites exhibited superior performance due to synergistic effects between reinforcements. The AA5083/BN–G composite achieved the highest hardness (86 HV) and a 61% reduction in wear rate compared to the base alloy. Electrochemical analysis revealed that CNT and graphene significantly enhanced corrosion resistance, with CNT-reinforced composites exhibiting exceptional charge transfer resistance.
 

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