|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Additive Manufacturing Fatigue and Fracture V: Processing-Structure-Property Investigations and Application to Qualification
||Cold Spray of Al and 6061 Al Alloy Powders: Effects of Oxide Thickness
||Trevor Bond, Mobin Vandadi, Arvand Navabi, Vahid Rahneshin, Ridwan Ahmed, Nima Rahbar, Vic Champagne, W.O. Soboyejo
|On-Site Speaker (Planned)
We present the results of a multi-scale study on mechanical behavior of a nanoscale oxide layer of Al/6061 Al alloy powders used in a cold spray process. The effects of oxide film thickness are elucidated using a combination of Molecular Dynamics (MD) simulations and finite element models. The induced stresses are shown to be significant to promote dynamic crack growth at rates that are comparable to the speed of sound in alumina. The underlying deformation and toughening mechanisms are elucidated via MD simulations. The oxide film properties obtained from the MD simulations are incorporated into finite element models of the cold spray of individual particles with different powder velocities and oxide film thicknesses. A bi-linear Johnson-Cook model is used to predict the deformation of the oxide films and the Al/6061 Al powders and substrate layers.
||Additive Manufacturing, Powder Materials, Modeling and Simulation