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Molecular dynamics simulation of nanoindentation of nanocrystalline Al/Ni multilayers

Chamani, M ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1016/j.commatsci.2015.10.022
  3. Publisher: Elsevier
  4. Abstract:
  5. Molecular dynamics simulations are employed to investigate material properties of nanocrystalline aluminum and nanocrystalline Al/Ni multilayers at low temperature. For this purpose, both single crystal and nanocrystalline multilayers with different grain sizes and grain morphology are used as the substrate. The results of the simulations show that hardness and elastic modulus decrease with refinement of grain size in nanocrystalline aluminum and refinement of grain size and layer thickness in nanocrystalline Al/Ni multilayers, regardless of grain morphology. Furthermore, the angle between two adjacent grains, which is directly connected to the grain boundary thickness, has a great influence on the hardness and elastic modulus in nanocrystalline single layer and multilayers. It is shown that for grain size between 4.5 and 9.5 nm and layer thickness less than 8 nm, hardness of nanocrystalline Al/Ni multilayer is more affected by the layer thickness rather than the grain size
  6. Keywords:
  7. Dislocation ; Aluminum ; Dislocations (crystals) ; Elastic moduli ; Grain boundary ; Grain refinement ; Grain size and shape ; Hardness ; Low temperature engineering ; Molecular dynamics ; Multilayers ; Nanocrystalline alloys ; Nanoindentation ; Single crystals ; Temperature ; Grain morphologies ; Hardness and elastic modulus ; Low temperatures ; Molecular dynamics simulations ; Nanocrystalline Al ; Nanocrystalline aluminum ; Nanocrystalline multilayer ; Nanocrystallines ; Nanocrystals
  8. Source: Computational Materials Science ; Volume 112 , 2016 , Pages 175-184 ; 09270256 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S0927025615006692