In this study,the effects of WC nano-particles amount and surface roughness on corrosion behavior of magnesium metal matrix nanocomposites in 3.5%NaCl solution are examined with the help of electrochemical test.Varyin...In this study,the effects of WC nano-particles amount and surface roughness on corrosion behavior of magnesium metal matrix nanocomposites in 3.5%NaCl solution are examined with the help of electrochemical test.Varying wt%of WC nano-particles(0.5,1,1.5 and 2)are used to fabricate metal matrix nano-composites through ultrasonic vibration assisted stir casting method.Basic characterizations of fabricated composites are performed by using scanning electron microscopy(SEM)and energy dispersive x-ray analysis(EDAX).SEM images show that nano-particles are well distributed throughout the magnesium matrix while EDAX results confirm the presence of WC particles in nano-composites.Micro-hardness result shows increasing trend with increasing weight percentage of WC.Mg nano-composite containing 0.5 wt%WC nano-particles is found to be the most corrosion resistive one followed by base alloy,Mg-2 wt%WC,Mg-1.5 wt%WC and Mg-1 wt%WC.Additionally,corrosion behavior of Mg-2WC with different surface quality is examined and it is observed that sample with lowest surface roughness shows better corrosion resistance.In the end,corrosion mechanisms are assessed with the help of SEM and EDAX study of corroded surfaces.展开更多
The present study investigates the effect of WC nano-particles on tribological behavior of magnesium based nanocomposites for varying wt%of WC(0.5,1,1.5 and 2 wt%).Nanocomposites are fabricated using ultrasonic vibrat...The present study investigates the effect of WC nano-particles on tribological behavior of magnesium based nanocomposites for varying wt%of WC(0.5,1,1.5 and 2 wt%).Nanocomposites are fabricated using ultrasonic vibration assisted stir casting method.Optical microscopy,scanning electron microscopy and energy dispersive x-ray patterns are used to characterize the base alloy and fabricated composites.Microhardness values of as-cast composites are obtained through Vicker’s micro-hardness tester.Friction and wear behavior of fabricated composites are studied using pin-on-disk type tribotester at room temperature under dry sliding condition.Operating load range is 10-40 N while sliding speed range is 0.1-0.4 m/s.Characterization of Mg-composites confirms particle inclusion as well as better microstructural integrity with increase in reinforcement.Hardness value of composites increases with increase in the amount of WC nano-particles.Wear and friction behavior of base matrix are also enhanced due to incorporation of WC nano-particles.Different wear mechanisms occurring at the contact surfaces are ascertained through SEM images and EDAX patterns.Oxidation in the tested surface is also identified through SEM and EDAX.This yields better tribological behavior in composites.展开更多
基金The authors gratefully acknowledge the support of DST(GOI)through Smart Foundry 2020 program.
文摘In this study,the effects of WC nano-particles amount and surface roughness on corrosion behavior of magnesium metal matrix nanocomposites in 3.5%NaCl solution are examined with the help of electrochemical test.Varying wt%of WC nano-particles(0.5,1,1.5 and 2)are used to fabricate metal matrix nano-composites through ultrasonic vibration assisted stir casting method.Basic characterizations of fabricated composites are performed by using scanning electron microscopy(SEM)and energy dispersive x-ray analysis(EDAX).SEM images show that nano-particles are well distributed throughout the magnesium matrix while EDAX results confirm the presence of WC particles in nano-composites.Micro-hardness result shows increasing trend with increasing weight percentage of WC.Mg nano-composite containing 0.5 wt%WC nano-particles is found to be the most corrosion resistive one followed by base alloy,Mg-2 wt%WC,Mg-1.5 wt%WC and Mg-1 wt%WC.Additionally,corrosion behavior of Mg-2WC with different surface quality is examined and it is observed that sample with lowest surface roughness shows better corrosion resistance.In the end,corrosion mechanisms are assessed with the help of SEM and EDAX study of corroded surfaces.
基金We gratefully acknowledge the support of DST sponsored Smart Foundry-2020 program of Jadavpur University .
文摘The present study investigates the effect of WC nano-particles on tribological behavior of magnesium based nanocomposites for varying wt%of WC(0.5,1,1.5 and 2 wt%).Nanocomposites are fabricated using ultrasonic vibration assisted stir casting method.Optical microscopy,scanning electron microscopy and energy dispersive x-ray patterns are used to characterize the base alloy and fabricated composites.Microhardness values of as-cast composites are obtained through Vicker’s micro-hardness tester.Friction and wear behavior of fabricated composites are studied using pin-on-disk type tribotester at room temperature under dry sliding condition.Operating load range is 10-40 N while sliding speed range is 0.1-0.4 m/s.Characterization of Mg-composites confirms particle inclusion as well as better microstructural integrity with increase in reinforcement.Hardness value of composites increases with increase in the amount of WC nano-particles.Wear and friction behavior of base matrix are also enhanced due to incorporation of WC nano-particles.Different wear mechanisms occurring at the contact surfaces are ascertained through SEM images and EDAX patterns.Oxidation in the tested surface is also identified through SEM and EDAX.This yields better tribological behavior in composites.
