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Compaction simulation of crystalline nano-powders under cold compaction process with molecular dynamics analysis

Khoei, A. R ; Sharif University of Technology | 2020

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  1. Type of Document: Article
  2. DOI: 10.1016/j.powtec.2020.06.069
  3. Publisher: Elsevier B. V , 2020
  4. Abstract:
  5. In this paper, the uniaxial cold compaction process of metal nano-powders is numerically analyzed through the Molecular Dynamics (MD) method. The nano-powders consist of nickel and aluminum nano-particles in the pure and mixed forms with distinctive contributions. The numerical simulation is performed using the different number of nano-particles, mixing ratios of Ni and Al nano-particles, compaction velocities, and ambient temperatures in the canonical ensemble until the full-dense condition is achieved. In the MD analysis, the inter-atomic interaction between metal nano-particles is modeled by the many-body EAM potential, and the interaction between frictionless rigid die-walls and metal nano-particles is modeled by the pairwise Lennard-Jones inter-atomic potential. The mechanical behavior of metal nano-powders under the compaction process is numerically studied by plotting the relative density–pressure, mean stress-strain, and material characteristics–strain curves. Moreover, the nano-powder behavior is visualized by means of the centro-symmetry contour at various stages of the forming process. Finally, the evolution of top-punch velocity on the final stage of compaction process is studied by plotting the compaction pressure against the total energy at various compaction velocities. © 2020 Elsevier B.V
  6. Keywords:
  7. Cold compaction ; Compaction velocity ; EAM potential ; Metal nano-powders ; Compaction ; Metals ; Nanocrystalline materials ; Nanoparticles ; Stress-strain curves ; Canonical ensemble ; Compaction pressure ; Interatomic interactions ; Interatomic potential ; Material characteristics ; Mechanical behavior ; Metal nano-particles ; Molecular dynamics methods ; Powder metals ; Metal nanoparticle ; Nickel nanoparticle ; Chemical analysis ; Cold ; Crystal ; Environmental temperature ; Geometry ; Pressure measurement ; Simulation ; Stress ; Temperature measurement ; Velocity
  8. Source: Powder Technology ; Volume 373 , August , 2020 , Pages 741-753
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S003259102030588X