Özet:

In this study, pure Al and Al-B4C, Al-Al2O3 composites with various boron carbide (B4C) or alumina (Al2O3) content (1, 3, 6, 9, 12, 15, 30wt.%) were fabricated by powder metallurgy method. The effect of the boron carbide or alumina reinforcement ratio on the porosity, density, Vickers hardness, compressive strength and microstructure of the composites was investigated. According to the test results, the highest experimental density, Vickers hardness, and compressive strength were obtained at Al-30%B4C (experimental density: 2.7 g/cm3, relative density: 96.7%, hardness: 75 HV, compressive strength: 178 MPa) and Al-30%Al2O3 (experimental density: 2.56 g/cm3, relative density: 87.7%, hardness: 52 HV, compressive strength: 162 MPa) composite structure. The hardness and compressive strength of Al-30%Al2O3 were increased by 73.3% and 80% compared to pure aluminum. On the other hand, the hardness and compressive strength of Al-30%B4C enhanced by 150% and 98% compared to pure aluminum.  As a result, it has been determined that Al-B4C composites have a denser microstructure and higher mechanical properties than Al-Al2O3 composites.

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