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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.