Influence of Hybrid Nanofluid Composition on Surface Roughness and Hardness During Roller Burnishing of Aluminum Alloys
Keywords:
Hybrid Nanofluid, Composition Ratio, Roller Burnishing, Aluminum Alloys, Surface Roughness, MicrohardnessAbstract
Hybrid nanofluids, formed by combining two different nanoparticles in a single base fluid, have gained attention for their enhanced lubrication and heat-transfer capabilities. However, the performance of such fluids is strongly influenced by the nanoparticle composition ratio, while most previous studies have employed a fixed 50:50 mixture. This study investigates the effect of hybrid nanofluid composition on surface roughness (Ra) and microhardness (HV) during roller burnishing of Al6061-T6, Al7075-T6, and Al2024-T3 aluminum alloys. Four hybrid nanofluid systems, namely Al₂O₃-CuO, Al₂O₃-TiO₂, Al₂O₃-graphene, and CuO-MWCNT, were prepared using deionized water at a constant nanoparticle concentration of 1.0 wt.%. Five composition ratios ranging from 100:0 to 0:100 were evaluated under identical burnishing conditions. The results showed that the optimum composition varied with the hybrid pair and generally differed from the commonly used 50:50 ratio. Among the investigated formulations, the Al₂O₃-graphene hybrid achieved the lowest surface roughness (Ra = 0.58 μm on Al7075-T6), while the Al₂O₃-CuO hybrid produced the highest microhardness (156 HV). The optimum compositions were identified as 75:25 for Al₂O₃-CuO, 60:40 for Al₂O₃-TiO₂, 60:40 for Al₂O₃-graphene, and 50:50 for CuO-MWCNT. The findings highlight the importance of composition optimization in improving surface integrity during hybrid nanofluid-assisted roller burnishing.
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