Sumit A. Suresh¹, Seok-Woo Lee¹, Mark Aindow¹, Harold Brody¹, Aaron T. Nardi², Victor K. Champagne², Avinash M. Dongare¹; ¹University of Connecticut, ²U.S. Army Research Laboratory

Cold spray is a versatile powder deposition technique where supersonic impacts of metallic powders result in successful adhesion or bonding of the particle with a substrate. Quasi-Coarse-Grained Dynamics (QCGD) simulations are carried out to investigate the deformation behavior of tantalum powders onto tantalum substrates at the mesoscales. The QCGD method solves the equations of motion for a reduced number of representative atoms and uses scaling relationships for interatomic potentials as well as degrees of freedom to retain the evolution of microstructure, temperatures and pressures during single particle impact as predicted using molecular dynamics simulations. This work discusses the framework (scaling relationships) of the QCGD method and demonstrate the capability to model the dynamic evolution of microstructure (defect evolution, twinning, etc.) at the time and length scales of experiments, i.e., time scales on the order of tens of nanoseconds and length scales on the order of tens of microns.