Abstract
This research aims to investigate the effect of using alumina nanoparticles on the final surface characteristics of the cylindrical specimens of Al 7175 manufactured through roller burnishing process. For this purpose, workpieces were divided into two groups of seven samples, and burnishing process was carried out in the lathe machine; The first time it was in dry mode and in the second it was performed by using nanofluid containing ethanol alcohol and alumina nanoparticles. In order to facilitate comparison of the results, the input parameters including the diameter of the workpiece, speed, feed rate, and burnishing tool were selected the same for both of the groups. Besides, dry and nanofluid burnishing, the number of passes and the penetration depth were taken into account as variable parameters of this study. Then, the samples were studied in order to determine the surface roughness and microhardness values. The results disclosed that the alumina nanofluid significantly decreased/increased the surface roughness/microhardness comparing to dry burnishing. In addition, the results showed that nanofluid improved sub-surface hardness and formed a thin layer of alumina ceramic on the surface of the aluminum alloy workpiece with the penetration depth of 0.4 mm.
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