Experimental investigation on the effect of process parameters on machinability and surface integrity during end milling of Mg-TiO₂ nanocomposite
by Ganesh Radhakrishnan
International Journal of Materials and Product Technology (IJMPT), Vol. 66, No. 3/4, 2023

Abstract: In this study, end milling experiment was performed on magnesium matrix nanocomposites with TiO₂ proportion of 1.5, 2.5 and 5 wt. % respectively under dry condition using Ti-AlN coated tungsten carbide tool. The tomographs of the specimens revealed the fact that there was no significant agglomeration. Mg-5% TiO₂ experienced better mechanical properties compared to that of other composite and pure Mg specimens. The microhardness and nanohardness was maximum for Mg-5% TiO₂ of about 63.89 Hv and 1.24 GPa respectively. The irregular crystalline structure of hard ceramic TiO₂ nanoparticulates and its bonding with the soft Mg matrix affected the machinability significantly. The maximum cutting force was observed for Mg-2.5% TiO₂, which is in the range of 10 to 14 N, whereas the maximum cutting temperature of approximately 32°C was observed for Mg-5% TiO₂. The interfacial bonding between TiO₂ and Mg due to increase in concentration of TiO₂ affects the machinability of nanocomposite to a greater extent than that of machining conditions. Ploughing phenomenon dominated at higher concentration of TiO₂ which in turn affected the surface integrity of machined nanocomposites. Higher order of surface roughness was noticed for Mg-5% TiO₂ of about 0.5 μm at spindle speed of 1,500 rpm.

Online publication date: Thu, 06-Apr-2023

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