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1506 |
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Interfacial microstructural evolution and bonding state of kinetic sprayed aluminum particle onto aluminum substrate |
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Kicheol Kang / Kinetic Spray Coating Laboratory (NRL), Division of Materials Science & Engineering, Hanyang University, Korea Sanghoon Yoon / Kinetic Spray Coating Laboratory (NRL), Division of Materials Science & Engineering, Hanyang University, 17 Haengdang-dong, Seongdong-ku, Korea Yoonjin Ham/ Kinetic Spray Coating Laboratory (NRL), Division of Materials Science & Engineering, Hanyang University, 17 Haengdang-dong, Seongdong-ku, Korea Changhee Lee/ Kinetic Spray Coating Laboratory (NRL), Division of Materials Science & Engineering, Hanyang University, 17 Haengdang-dong, Seongdong-ku, Korea |
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In kinetic spraying, the deposition of particles onto substrate is built up through kinetic energy of solid-state particles accelerated to super-sonic velocity. The interface of impacting particles experiences severe and localized plastic deformation under high strain rate and forms the solid-state bonding. In this study, microstructure at interface between individually deposited particle and substrate were investigated utilizing focused ion beam (FIB) system and field emission transmission electron microscopy (FE-TEM). Equiaxed fine grains whose sizes are in between one and two hundreds nanometer were observed at interface. Through dynamic recrystallization, this grain refinement occurs due to strain localization at interface during high strain rate deformation. And utilizing high resolution electron microscopy (HREM), bonding state of interface was observed. And crystallographic relationship between deposited particle and substrate was analyzed and discussed. Keywords: interface, microstructure, dynamic recrystallization, solid-state bonding, FE-TEM |