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- 저자 : Periyakaruppan Karuppasamy (검색결과 2 건)
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Periyakaruppan Murugesan,V. Satheeshkumar,N. Jeyaprakash,Che‑Hua Yang,Sundara Subramanian Karuppasamy 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.9
AlSi10Mg is a hypoeutectic alloy that has remarkable characteristics and implemented in diverse areas. Most of theAlSi10Mg parts are fabricated via traditional processes. The AlSi10Mg parts made by these processes have coarsermicrostructure, reduced mechanical behaviors, and minimum lifespan. This study is aimed at manufacturing the AlSi10Mgparts by Laser Powder Bed Fusion (LPBF) process followed by analyzing their mechanical properties. The microstructureevolution was examined from the micrographs of Optical Microscope (OM), Field Emission Scanning Electron Microscope(FESEM), Electron Backscatter Diffraction (EBSD), and Transmission Electron Microscope (TEM). Tafel, Nyquist, Bodeand surface plots were used to determine the corrosion resistance and surface roughness at different intervals. FESEMmicrographs revealed the existence of bimodal equiaxed α-Al grains containing Si phase as their grain boundaries. Aftersolidification, the secondary precipitates (Mg2Si) were segregated in the printed sample which accounts for enhancing themechanical characteristics. More grain growth and textures were noticed along the building direction of the sample andthis direction exhibits higher hardness compared with the scanning direction. Further, TEM analysis confirmed that theformed microstructure is rich in equiaxed α-Al with Si eutectics. Corroded X-ray Diffraction (XRD) plot showed that themaximum intensity of MgAl2O4is observed at 25 h immersion test sample. Among the various samples, 25 h LPBF sampleprovides significant resistance toward corrosion based on the values of current density, polarization resistance and averagesurface roughness. This is due to the formation of stable passive film on its surface thereby providing better anti-corrosioncharacteristics.
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Krishnan Venkatesh,Balamurugan Muthukutty,Shen-Ming Chen,Periyakaruppan Karuppasamy,Ahmed S. Haidyrah,Chelladurai Karuppiah,Chun-Chen Yang,Sayee Kannan Ramaraj 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.106 No.-
This work focussed on the fabrication of synergetic spinel CoMn2O4 embedded reduced graphene oxide(CoMn2O4@RGO) nanocomposite over the surface of modified screen-printed carbon electrode (SPCE) forhighly sensitive and enhanced electrochemical detection of metol (MTL) in 0.05 M phosphate buffer electrolyte. The CoMn2O4@RGO nanocomposite material was synthesized by sonochemical method and wellcharacterizedusing various spectral and analytical (XRD, TGA, Raman spectroscopic, FE-SEM, HR-TEM &EA) techniques. Cyclic and differential pulse voltammetry techniques were used for the detection of MTLat CoMn2O4@RGO modified SPCE. The present electrochemical sensor shows a dynamic linear responserange from 0.01 to 137.65 mM and the detection limit, quantification, sensitivity were estimated to be0.050 mM, 1.64 mM, and 3.77 mA mM1 cm2. Furthermore, the proposed MTL sensor was exhibited numerousadvantages including very ease fabrication, high selectivity, stability, and reproducibility for thedetection of MTL. Based on the obtained experimental data a plausible MTL redox mechanism was proposed. In addition, the present electrochemical sensor was applied in real sample analysis at the spikedsamples (lake water samples + MTL) observed with good recovery results.
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