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Aluminum AC4B composite reinforced with Boron Carbide (B 4 C) was made by stir casting. The characteristics such as toughness, impact strength, and tensile strength were determined. Aluminum AC4B acts as a matrix in the composite given the fraction volume variation of B 4 C reinforcing particulate of 1; 3; 5; 7; 10 % Vf  followed by the addition of 5 %wt magnesium as a wetting agent, 0.04 wt-% of Strontium as modifier agent, and 0.15 %wt Al-5 Ti-1 B as a grain refinement agent through the stir casting process. The composites produced was charatcterised both microstructure by Optical Microscope (OM), Scanning Electron Microscope (SEM), link to Energy Dispersive Spectroscopy (EDS), and mechanical properties such as characterize each composite material such as tensile, hardness, and impact tests. The phases formed in the composite were α-Al, Eutectic Silicon, primary Mg 2 Si, binary Mg 2 Si, ternary Mg 2 Si, β-Al 5 FeSi, Al 2 Cu, Al 3 BC, dan AlB 2 . There is an increase in mechanical properties of AC4B/B4C compared to Aluminum AC4B base material, such as its tensile strength which reaches 149.032 MPa and its hardness reaches 49.3 HRB.

The characteristics of aluminum AC4B composites reinforced by the fraction volume variations of Boron Carbide through the stir casting process