Adiabatic shear instability is not necessary for adhesion in cold spray
Name
MostafaHassani-Gangarajetal_ActaMaterialia1582018430-439.pdf
Description
Accepted version
Size
1.47 MB
Format
Adobe PDF
Checksum (MD5)
23ac26df4b20f9a3725eab2a997c9a0b
Author(s)
Hassani-Gangaraj, Mostafa
Veysset, David
Champagne, Victor K
Nelson, Keith A
Schuh, Christopher A
Date Issued
2018
Journal
Acta Materialia
Publisher
Elsevier BV
Version
Author's final manuscript
Abstract
© 2018 Acta Materialia Inc. When metallic microparticles impact substrates at high enough velocity, they bond cohesively. It has been widely argued that this critical adhesion velocity is associated with the impact velocity required to induce adiabatic shear instability. Here, we argue that the large interfacial strain needed to achieve bonding does not necessarily require adiabatic shear instability to trigger. Instead, we suggest that the interaction of strong pressure waves with the free surface at the particle edges—a natural dynamic effect of a sufficiently rapid impact—can cause hydrodynamic plasticity that effects bonding, without requiring shear instability. We proceed on this basis to postulate and confirm a proportionality between critical velocity and the bulk speed of sound, which supports the viewpoint that shear instability is not the mechanism of adhesion in cold spray.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
Massachusetts Institute of Technology. Institute for Soldier Nanotechnologies
Massachusetts Institute of Technology. Department of Chemistry
Terms of Use
Creative Commons Attribution-NonCommercial-NoDerivs License
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1016/J.ACTAMAT.2018.07.065
