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Electron backscattered diffraction and nanoindentation are used to identify how the local changes of microstructure influence the hardness distributions of cold-sprayed Ni and Cu coatings. The hardness in the vicinity of Ni particle interfaces can be about 1.5GPa higher than that in the particle interior, and this difference is attributed to the cold-spray-induced grain boundaries and dislocation...
Electron Backscatter diffraction was used to investigate the microstructural evolution of nickel powder particles during the high-velocity impact in the cold spray process. Ultrafine grains in the scale of 100–200nm were observed in the particle bonding region. The formation of these nanometer-sized grains is interpreted in terms of dynamic recrystallization by lattice and subgrain rotation.
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