Machining characterization of aa7075 tib2 in situ composites

Abstract

Aluminium Matrix Composites AMCs fulfill the demands for high performance materials in the modern era AMCs are increasingly preferred in place of conventional aluminium alloys due to several desirable properties which are not limited to higher specific strength improved wear resistance and stability at elevated temperature AMCs have been a challenge to machine due to increased tool wear In this research AA7075 0 12wt AMCs have been synthesized by employing inorganic salts K2TiF6 and KBF4 in situ reaction of molten aluminium The produced composite showed a uniformity in distributing TiB2 particles The cylindrical composite bars were turned by using a conventional lathe and by employing Poly Crystalline Diamond PCD cutting tool The machining forces were recorded during dry turning and the surface roughness was measured The cutting tool chips and machined surface have been observed by using Field Emission Scanning Electron Microscope FESEM The role of cutting speed and the TiB2 particle content on the turning characteristics were investigated The machining forces reduced when the cutting speed and TiB2 particles increased An increase in cutting speed improved the surface finish while an increase in TiB2 particles increased the surface roughness newline