Microstructure and Mechanical Behavior of FeCrAl and Mo Coated Zr Substrate by Cold-Spraying Process

摘要

FeCrAl and Mo layers were cold-sprayed onto a Zr surface, with the Mo layer introduced between the FeCrAl coating and the Zr matrix preventing interdiffusion. Microstructural characterization of the first-deposited Mo layer and the Zr matrix immediately below the Mo/Zr interface was performed using transmission electron microscopy, and near-interface elemental distributions were obtained using energy-dispersive X-ray spectroscopy. The deformation of the coated Mo powder induced the formation of microbands and nanoscale mechanically interlocked structures, whereas the enhanced hardness and cleavage fracture morphology of the Zr matrix immediately below the Mo/Zr interface indicated the occurrence of localized deformation owing to Mo particle impact. The effects of the coating on the mechanical properties of Zr plate were examined by tensile tests conducted at room temperature and 380°C, Although the thickness of Zr matrix was reduced, the tensile strength of coated Zr plate sample was increased at 380°C compared to non-coating sample.