Impact of Sandblasting and Laser Texturing on Microstructure and Elevated Temperature Tribological Behavior of Cold-Sprayed B4C and Graphene Nanoplatelet-Reinforced AA7075

This study investigates the effects of sandblasting (SB) and laser texturing (LT) on the surface roughness, coating morphology, and wear performance of Al-7075 alloy reinforced with 4% mu B4C, 4% GNP, and a dual combination of 2% mu B4C + 2% GNP. Surface roughness analysis showed significant differences between SB and LT samples, with SB samples exhibiting higher roughness. SB Al-4%mu B4C demonstrated the highest roughness, enhancing mechanical interlocking and coating adhesion. Wear tests conducted at 300 degrees C revealed the SB Al-4%Dual composition achieved the lowest coefficient of friction and wear volume loss. The wear volume loss increased in the order of Al-4%Dual < Al-4%<mu>B4C < Al-4%GNP for both SB and LT specimens, highlighting the superior wear resistance of the dual reinforcement.