Akademik Veri Yönetim Sistemi
CERAMICS INTERNATIONAL, cilt.51, sa.27, ss.54627-54644, 2025 (SCI-Expanded, Scopus)
This study presents the fabrication and evaluation of bilayer aluminum matrix composites based on AA7075 alloy, reinforced with boron carbide (B4C), graphene nanoplatelets (GNPs), and potassium titanium fluoride (K2TiF6). A hybrid processing route-combining powder metallurgy, stir casting, and squeeze casting-was employed to produce layered structures with reinforcement-specific configurations. Mechanical characterization showed that increasing GNP content slightly reduced relative density (from 98.6 % to 96.6 %) while significantly enhancing microhardness (up to 194.1 HV0.5) and transverse rupture strength (up to 680 MPa). Ballistic performance, evaluated against 7.62 x 51 mm armor-piercing projectiles under NIJ Level III standards, revealed that the N3 composite with 1 wt% GNP achieved the highest ballistic limit velocity (V50 approximate to 620 m/s), compared to 595 m/s for the monolithic AA7075 reference. These improvements are attributed to the combined influence of the ceramic and carbon-based reinforcements, along with the flux agent, which together enhanced interfacial bonding and mechanical response. The results indicate that the developed bilayer composites are promising candidates for advanced lightweight armor applications.