The stress–strain behaviour of cold-sprayed Ta coatings, deposited onto Al and steel substrates, was studiedby depth-sensing spherical and sharp (Berkovich) indentation testing, and was compared to that of anannealed Ta sheet. The mechanical properties of the coatings, free of any scale-dependence, are insensitive tothe presence of a lamellar structure, indicating strong, tight bonding between cold-sprayed Ta particles.Accordingly, the coatings are isotropic. The stress–strain curves reveal that the coating material experiencedsome degree of work-hardening during cold-spraying; indeed, the sprayed particles were plasticallydeformed at impact. This was confirmed by line profile analysis on XRD patterns. The consistency between theresults from different indentation testing techniques provides a means to cross-validate the entire analysis.
Depth-sensing indentation for assessing the mechanical properties ofcold-sprayed Ta / Bolelli, Giovanni; Bonferroni, Benedetta; H., Koivuluoto; Lusvarghi, Luca; P., Vuoristo. - In: SURFACE & COATINGS TECHNOLOGY. - ISSN 0257-8972. - STAMPA. - 205:(2010), pp. 2209-2217. [10.1016/j.surfcoat.2010.08.146]