Modeling on Deformation Behavior of Al Particles Impacting on Al Substrate andEffect of Surface Oxide Films on Interfacial Bonding in Cold Spraying

摘要

In this study, a comprehensive examination of deformation ofAl particles impacting on Al substrate was conducted by usingthe Arbitrary Lagrangian Eulerian (ALE) method to clarify thedeposition characteristics of Al powder and effect of surfaceoxide films in cold spraying. It was found that the deformationbehaviour of Al particles is different from that of Cu particlesunder the same impact conditions owing to its lower densityand thus less kinetic energy upon impact. The results indicatethat the Al particles need a higher velocity to reach the samecompression ratio as that of Cu particles. On the other hand,the numerical results show that the oxide films at particlesurfaces influences the bonding condition between theparticles and substrate. The inclusions of the crushed oxidefilms at the interfaces between the depostied particles inhibitthe deformation.