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In the present study, attempts were made to coat the B4C powders with TiB2 via a sol-gel process, and then squeeze cast A356 matrix composites reinforced with coated B4C particles were fabricated. X-ray diffraction studies also confirmed the existence of boron carbide and some other reaction products such as TiB2, AlB2 and Al3BC in composite samples. It was observed that the amount of porosity increased with increasing the volume fraction of composites. Tensile behavior and hardness of unreinforced alloy and composites were evaluated. It was noted that the elastic constant, strain-hardening and UTS of the metal matrix composites (MMCs) were higher than those of the un-reinforced Al alloy and increased with increasing of coated B4C content. The strengthening of particulate reinforced metal-matrix composites is associated with a high dislocation density in the matrix due to the difference in coefficient of thermal expansion between the reinforcement and the matrix. K e y w o r d s: MMCs, aluminum, boron carbide, sol-gel processing

Effect of coated B4C reinforcement on mechanical properties of squeeze cast A356 composites