4.7 Article

Effects of modulation periods on mechanical properties of V/VN nano-multilayers

Journal

CERAMICS INTERNATIONAL
Volume 45, Issue 8, Pages 10295-10303

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2019.02.084

Keywords

V/VN nano-multilayers; MD simulations; Modulation period; Interface; Dislocation

Funding

  1. National Natural Science Foundation of China [11802045, 11332013, 11802047]
  2. Chongqing Postdoctoral Program for Innovative Talents [CQBX201804]
  3. China Postdoctoral Science Foundation [2018M631058]
  4. Chongqing Research Program of Basic Research and Frontier Technology [cstc2018jcyjAX0522]

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Metal/ceramic nano-multilayers, which possess the advantages of both metal and ceramics, have attracted intensive attention. In this work, the mechanical properties of V/VN nano-multilayers with different modulation periods (lambda s) were investigated using molecular dynamics simulations. The relationships between the microstructures and stress-strain (sigma-epsilon) curves during in-plane tension and out-of-plane compression were explored, and the effects of lambda were discussed. It shows that: (i) three kinds of V/VN nano-multilayers with different interfacial structures have different stabilities during deformation; (ii) dislocations nucleate firstly from the interfaces, propagate on {111} planes in VN layers, and deposit on the adjacent interface, and finally shift to V layers with the increase of applied strain; (iii) the nano-multilayer with larger lambda has larger elastic modulus, elastic limit and lattice integrity, and strain hardening and cracks would appear in the nano-multilayers with lambda > 42.90 angstrom.

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