Mechanical Properties of Friction Stir Processed B4C/Gr-Reinforced Hybrid Composite Fabricated Through Stir Casting Method

In the present work, aluminum (AA2024) metal matrix composites are made by reinforcing a fixed amount of solid lubricant Gr (2%) with varying amounts of B4C from 2, 4, and 6 % using the liquid state stir casting process. Then friction stir processing has been done to enhance the grain structure and particles distribution in the cast product. The mechanical properties of hybrid Al-B4C/Gr metal matrix composite are investigated on the basis of fatigue, tensile and hardness testing. The homogeneous distribution of reinforcing particles is confirmed by the microstructural investigation. The result of experiment showed that on reinforcing B4C & Gr and friction stir processing, the hardness of fabricated hybrid metal matrix composite is improved by 15 % and the tensile strength is improved by 69 %. The fatigue crack propagation shows that crack propagation is more in case of higher constituent of composite materials.