In situ observations of jetting in the divergent rebound regime for high-velocity metallic microparticle impact

© 2020 Author(s). Metallic bonding of certain materials can be achieved via high-velocity impact, and this type of bonding is often linked to an intense extrusion of material from the impact site, known as jetting. We present in situ observations of hydrodynamic jetting and ejection of matter from high-velocity metallic microparticle impacts that still result in rebound of the particle. While the occurrence of jetting has been linked to permanent particle deposition in prior studies, the present findings reveal that any bonds that may form upon jetting can be rebroken by particle rebound in some circumstances. We further present asymmetric occurrences of jetting associated with localized delays in particle detachment followed by rotation during particle rebound, which may speak to transient bond formation at the jetting sites.DOE Office of Science, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering (No. DE-SC0018091)U.S. ARO and CCDC Army Research Laboratory through the Institute for Soldier Nanotechnologies (No. W911NF-18-2-0048)Office of Naval Research DURIP (No. N00014-13-1-0676