Investigation on Mechanical Properties and Microstructure of B4C/Graphene Binary Particles Reinforced Aluminum Hybrid Composites

다국어 초록 (Multilingual Abstract)

In the present study, boron carbide and graphene-reinforced aluminum hybrid composites with various boron carbide (1,3, 6, 9, 12, 15, 30 wt%) and graphene nanoplatelets (GNPs) content (0.15, 0.30, 0.45 wt%) were produced by the powdermetallurgy method. The method consists of mixing, ultrasonic dispersing, mixing, fltering, drying, pressing, and sinteringprocesses. The apparent density, compressive strength, and Vickers hardness of the fabricated composites were determined bydensity meter, universal test machine, and micro Vickers hardness measurement device, respectively. The phase and microstructural analysis of the fabricated composites were analyzed using an X-ray difraction device and scanning electron microscope, respectively. The maximum apparent density (2.54±0.005 g/cm3), the highest Vickers hardness (109.8±1.5 HV),the best compressive strength (244±5 MPa), and minimum porosity (4.0%) were obtained at Al-30%B4C-0.15%GNPscomposite. The enhancement in Vickers hardness and compressive strength of Al-30%B4C-0.15%GNPs composite wasdetected as +293% and +190% compared with pure aluminum. In conclusion, it was detected that the mechanical strengthof Al-30B4C-GNPs composites improved up to 0.15 wt%GNPs content. After 0.15 wt%graphene content, the mechanicalstrength of Al-30B4C-GNPs composites decreased due to the agglomerated graphene nanoparticles.

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