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"Tamping effect during additive manufacturing of copper coating by cold" by Peng Gao, Che Zhang et al.

The tamping effect is of great importance for the microstructure evolution, surface roughness, and mechanical performance of additively manufactured coatings by cold spray. A good understanding of the advantages and disadvantages of the tamping effect is therefore crucial for producing high-quality coatings, unfortunately, very few studies along this direction have been conducted. In this study, a multi-particle impact model was proposed to investigate the tamping effect on the deformation behavior and morphology of Cu particles in cold spray. It was found that the tamping effect could induce a traceable change in the flattening ratio of the first coating layer, which served as a reliable indicator for identifying the critical velocity. By continuously flattening the particles, the tamping effect led to a denser microstructure of the under-layer coating, although such a densification effect would become weaker with the increase of coating thickness. At a high impact velocity, the obstr ....

Additive Manufacturing , Cold Spray , Critical Velocity , Olecular Dynamic Simulation , Amping Effect ,

"Atomic rheology analysis of the external magnetic field effects on nan" by Yuanzhou Zheng, Xinzhu Zhang et al.

Abstract
In the present study, the molecular dynamics method is used to probe the aggregation phenomenon of hybrid nanoparticle within platinum microchannel with pyramidal barriers. In molecular dynamics simulations, argon atoms are described as base fluid particles and for the interaction between these atoms, we use Lennard-Jones potential, while the platinum–platinum and Al O nanoparticles interactions are simulated applying the embedded atom method force field. To analyze the achieved simulation results, some physical parameters such as potential energy, temperature, and distance of nanoparticles center of mass are calculated. The results show external magnetic field decrease the aggregation phenomenon in nanoparticles. Numerically, by adding external magnetic field to simulation box, the COM distance of nanoparticles reaches to 2.7 Å and the aggregation time of nanoparticles changes from 1.7 to 2.3 ns. These appropriate effects of external magnetic field from our compu ....

Olecular Dynamic Simulation ,