Elastic moduli and elastic anisotropy of cold sprayed light-metal coatingsThursday (09.11.2017) 14:40 - 15:00 Part of:
Cold spraying (CS) is a versatile and efficient method for deposition of relatively thick metallic coatings. Unlike the conventional thermal spraying methods such as plasma spraying the CS process does not involve substantial heating or melting of the sprayed powders. Instead, the formation of the coating arises from a severe plastic deformation of the accelerated powder particles upon their impingement at the substrate. Resonant ultrasound spectroscopy was applied to analyse the elastic anisotropy of thick aluminium and titanium coatings prepared by cold spraying and to determine the respective elastic moduli. The results show that the coatings exhibit only weak deviations from perfect isotropy, and the obtained elastic moduli are comparable with those of the corresponding polycrystalline bulks. The increased internal friction observed of the studied coatings may indicate grain refinement and consequent grain boundary sliding.