Interface melding in cold spray titanium particle impact

A focused ion beam (FIB) was used to characterize deformation and bonding behavior of titanium particles, cold sprayed onto a titanium surface. By milling away half of each particle a cross-section was obtained, revealing the particle–substrate interface. It was found that in some sections, voids li...

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Bibliographic Details
Published in:Surface & coatings technology 2014-01, Vol.239, p.191-199
Main Authors: King, Peter C., Busch, Christian, Kittel-Sherri, Teresa, Jahedi, Mahnaz, Gulizia, Stefan
Format: Article
Language:English
Subjects:
Adiabatic shear
Bonding
Cold spray
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Focused ion beam
Materials science
Physics
Surface treatments
Titanium
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Summary:A focused ion beam (FIB) was used to characterize deformation and bonding behavior of titanium particles, cold sprayed onto a titanium surface. By milling away half of each particle a cross-section was obtained, revealing the particle–substrate interface. It was found that in some sections, voids lined the interface due to mismatch in particle- and substrate-surface topologies. In other places, the interface could not be discerned due to closure of the voids. It is shown that this effect was related to adiabatic shear instability, which caused violent jetting, ejection of molten material from the particle, and thermal softening of the interfacial layers. Deformation characteristics and variation in splat profiles due to microstructural influences, and the effect of particle size are also discussed. •Nanoscale void closure found in cold spray Ti interfaces•Experimental observation of preferential bonding at particle peripheries•Demonstration of link between jetting and bonding processes•Interfacial melting shown in Ti particle impact
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2013.11.039