Loading...

Nanoindentation study of cementite size and temperature effects in nanocomposite pearlite: A molecular dynamics simulation

Ghaffarian, H ; Sharif University of Technology

925 Viewed
  1. Type of Document: Article
  2. DOI: 10.1016/j.cap.2016.05.024
  3. Publisher: Elsevier B.V
  4. Abstract:
  5. We carry out molecular dynamics simulations of nanoindentation to investigate the effect of cementite size and temperature on the deformation behavior of nanocomposite pearlite composed of alternating ferrite and cementite layers. We find that, instead of the coherent transmission, dislocation propagates by forming a widespread plastic deformation in cementite layer. We also show that increasing temperature enhances the distribution of plastic strain in the ferrite layer, which reduces the stress acting on the cementite layer. Hence, thickening cementite layer or increasing temperature reduces the likelihood of dislocation propagation through the cementite layer. Our finding sheds a light on the mechanism of dislocation blocking by cementite layer in the pearlite
  6. Keywords:
  7. Cementite size effect ; Dislocations blocking ; Molecular dynamics simulation ; Nanocomposite pearlite ; Nanoindentation ; Carbides ; Ferrite ; Nanocomposites ; Pearlite ; Plastic deformation ; Temperature ; Coherent transmission ; Deformation behavior ; Dislocation blocking ; Dislocation propagation ; Ferrite layers ; Increasing temperatures ; Size effects ; Molecular dynamics
  8. Source: Current Applied Physics ; Volume 16, Issue 9 , 2016 , Pages 1015-1025 ; 15671739 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S1567173916301432