The effect of particulate strengthening on microstructure and mechanical characterization of binary-modified composites on mild steel

This article presents the microstructure, tribological behavior, and hardness properties of the Zn-TiO2 functional composite coating produced using electrolytic co-deposition technique. The 7.0–13.0 weight fractions of Ti particles were incorporated in a Zn bath to form Zn-TiO2 alloy in the presence of other additives. The microstructural properties of the fabricated coating were investigated using a scanning electron microscope equipped with an energy-dispersive spectroscope, X-ray diffraction, and an atomic force microscope. The anticorrosion behavior in 3.65% NaCl medium was studied using potentiodynamic polarization technique and characterized using high-resolution optical microscope. The hardness and wear properties of the coated alloys were measured with high diamond microhardness tester and reciprocating sliding tester, respectively. From the results, the increases in hardness and wear resistance are attributed to the formation of the incorporated particulate and uniform precipitation of the metal grains at the metal lattice. The contribution of TiO2 particles especially with Zn-13Ti-0.3 V-S provides new orientation of metal–matrix-modified coated structure and decrease in friction coefficient. The anticorrosion resistance characteristics were found to improve significantly in response to concentration of additive

Experimental Correlation Between Silicon Carbide And Hardness Values in Heat- Treated Al-Si-Fe/Sic Particulate Composites

The effect of varying silicon carbide on the hardness values of heat–treated Al-Si-Fe/SiC particulate composites have been investigated. 5-25% SiC additions were used for the production of different grades of Al-Si-Fe/SiC particulate composites. The composites samples were solution heat-treated at 500oC for 3hours and quenched in warm water at 65oC, aged at100, 200, and 300oC with various ageing time between 60 to 660minutes at 60minutes. Hardness measurements were made using Rockwell hardness tester. Experimental correlations obtained between the varying silicon carbide addition, heat-treatment parameters and the hardness values were analyzed using kinetic of ageing and factorial analysis (2K). The results show that hardness increases with increasing percentage of silicon carbide addition in the alloy and decreases with increasing ageing time. These results, which are in agreement with the experimental findings for these ageing time and temperatures. Show a substantial improvement in hardness has been achieved in the reinforced metal matrices produced.Keywords: Al-Si-Fe/SiC, Ageing, Composite, Hardness values, Solution Heattreated, Particulate and silicon carbide