Dr.C.Antony Vasantha Kumar - Academia.edu (original) (raw)
Uploads
Papers by Dr.C.Antony Vasantha Kumar
Transactions of Nonferrous Metals Society of China, 2016
Abstract The effect of rutile (TiO 2 ) content on the wear and microhardness properties of alumin... more Abstract The effect of rutile (TiO 2 ) content on the wear and microhardness properties of aluminium (Al)-based hybrid composites was explored. The proposed content of TiO 2 (0, 4%, 8%, 12%, mass fraction) was blended to Al–15%SiC composites through powder metallurgy (P/M) process. Wear test was conducted using pin-on-disc apparatus under dry sliding conditions. Fabricated preforms were characterized using X-ray diffractometer (XRD), scanning electron microscope (SEM) and energy-dispersive X-ray spectrometer (EDS). Optical micrographs of the composite preforms display uniform distribution of TiO 2 throughout the matrix. Quantitative results indicate that wear resistance and microhardness increase with the increase of TiO 2 content. SEM images unveil that high wear resistance is attributed to high dislocation density of deformed planes and high hardness of TiO 2 . SEM images of wear debris display gradual reduction in mean size of debris when TiO 2 content increases. EDS spectra confirm the presence of oxide layer which obviously reduces the effective area of contact between the sliding surfaces thereby lowers the wear loss of composites. The observation concludes that delamination and adhesive wear are the predominant mechanisms.
Journal of Materials Research, 2016
A novel approach of powder metallurgy processed, cost-effective, environmentally friendly materia... more A novel approach of powder metallurgy processed, cost-effective, environmentally friendly material, rutile, is proposed as an alternate to the conventional titanium-dioxide (TiO 2) in the process of enhancing tribological behavior of aluminium (Al) based composites. Rutile, also possess good thermal stability which is essential for any material subjected to high temperature applications. The role of rutile (TiO 2) in the enrichment of tribological and microhardness properties of aluminium based metal matrix composites is presented. Al matrix composite was reinforced with rutile (TiO 2) to the proposed compositions (0, 4%, 8%, 12%, mass fraction) through powder metallurgy route. Wear test was done using pin-on-disc apparatus under dry sliding conditions. The preforms were then characterized using optical microscopy (OM), scanning electron microscope (SEM) and energy-dispersive x-ray spectrometer (EDS). Outcomes suggest that to increase in mass fraction of TiO 2 , sintered density of the preforms approaches the theoretical density. OM images ratify uniform dispersion of TiO 2 implants within the Al matrix. TiO 2 offers promising wear and microhardness properties to the proposed composites which attribute to a high dislocation density of deformed planes. Plastic shearing, in conformity with the propagation of shear cracks broke particles as loose fragments which reduces the effective area of contact between the sliding surfaces and reduces loss of material in Al-12% TiO 2 composite. Mechanism of wear disclosed through SEM images and EDS patterns concludes that delamination and adhesion dominates the material removal.
Lecture notes on data engineering and communications technologies, Jul 20, 2022
Transactions of Nonferrous Metals Society of China, 2016
Abstract The effect of rutile (TiO 2 ) content on the wear and microhardness properties of alumin... more Abstract The effect of rutile (TiO 2 ) content on the wear and microhardness properties of aluminium (Al)-based hybrid composites was explored. The proposed content of TiO 2 (0, 4%, 8%, 12%, mass fraction) was blended to Al–15%SiC composites through powder metallurgy (P/M) process. Wear test was conducted using pin-on-disc apparatus under dry sliding conditions. Fabricated preforms were characterized using X-ray diffractometer (XRD), scanning electron microscope (SEM) and energy-dispersive X-ray spectrometer (EDS). Optical micrographs of the composite preforms display uniform distribution of TiO 2 throughout the matrix. Quantitative results indicate that wear resistance and microhardness increase with the increase of TiO 2 content. SEM images unveil that high wear resistance is attributed to high dislocation density of deformed planes and high hardness of TiO 2 . SEM images of wear debris display gradual reduction in mean size of debris when TiO 2 content increases. EDS spectra confirm the presence of oxide layer which obviously reduces the effective area of contact between the sliding surfaces thereby lowers the wear loss of composites. The observation concludes that delamination and adhesive wear are the predominant mechanisms.
Journal of Materials Research, 2016
A novel approach of powder metallurgy processed, cost-effective, environmentally friendly materia... more A novel approach of powder metallurgy processed, cost-effective, environmentally friendly material, rutile, is proposed as an alternate to the conventional titanium-dioxide (TiO 2) in the process of enhancing tribological behavior of aluminium (Al) based composites. Rutile, also possess good thermal stability which is essential for any material subjected to high temperature applications. The role of rutile (TiO 2) in the enrichment of tribological and microhardness properties of aluminium based metal matrix composites is presented. Al matrix composite was reinforced with rutile (TiO 2) to the proposed compositions (0, 4%, 8%, 12%, mass fraction) through powder metallurgy route. Wear test was done using pin-on-disc apparatus under dry sliding conditions. The preforms were then characterized using optical microscopy (OM), scanning electron microscope (SEM) and energy-dispersive x-ray spectrometer (EDS). Outcomes suggest that to increase in mass fraction of TiO 2 , sintered density of the preforms approaches the theoretical density. OM images ratify uniform dispersion of TiO 2 implants within the Al matrix. TiO 2 offers promising wear and microhardness properties to the proposed composites which attribute to a high dislocation density of deformed planes. Plastic shearing, in conformity with the propagation of shear cracks broke particles as loose fragments which reduces the effective area of contact between the sliding surfaces and reduces loss of material in Al-12% TiO 2 composite. Mechanism of wear disclosed through SEM images and EDS patterns concludes that delamination and adhesion dominates the material removal.
Lecture notes on data engineering and communications technologies, Jul 20, 2022