Strain rate dependence of tension and compression behavior in nano-polycrystalline vanadium nitride
Source abstract
Abstract
Abstract We performed molecular dynamics (MD) uniaxial tension and compression simulations of nano-polycrystalline (npc) vanadium nitride (VN) with different strain rates to investigate strain rate effects and tension-compression asymmetry in npc VN. The Zener's familiar anisotropy index A of the polycrystalline VN model is 0.957, very closed to 1.0, demonstrating its elastic isotropy. The Young's modulus increases with the increase of strain rate. The yield strain, yield stress and flow stress increase in power form with the increase of strain rate. As the strain rate varies in the range between 5E8 and 1E9 s−1, strain rate effect becomes insignificant, and the corresponding loading can be regarded as quasistatic or low strain rate loading. Tension-compression asymmetry was observed and analyzed systematically. The elastic tension-compression asymmetry should be ascribed to the higher friction in compression, the asymmetry of interatomic potential, and the effect of cutoff distance in a MD simulation. While the plastic tension-compression asymmetry should mainly result from the different kinds of atomic interaction, intergranular fracture and dislocation glide. No distinct grain boundary sliding was found.
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Research context
OpenAlex topics: Metal and Thin Film Mechanics · Boron and Carbon Nanomaterials Research · Advanced materials and composites
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References (48)
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1. E.O. Hall, The deformation and ageing of mild steel. 3. Discussion of results, Proc. Phys. Soc. Lond. Sect. B, 64, 1951, pp. 747–753.10.1088/0370-1301/64/9/303 ↗
2. The cleavage strength of polycrystals
3. On the validity of the Hall-Petch relationship in nanocrystalline materials10.1016/0036-9748(89)90342-6 ↗
4. Grain-size dependent mechanical behavior of nanocrystalline metals10.1016/j.msea.2015.07.075 ↗
5. Nucleation and propagation of dislocations in nanocrystalline fcc metals10.1016/j.actamat.2005.12.026 ↗
6. Softening of nanocrystalline metals at very small grain sizes10.1038/35328 ↗
7. MD simulation of deformation mechanisms in nanocrystalline10.1002/9783527626892.ch7 ↗
8. Dislocation nucleation governed softening and maximum strength in nano-twinned metals10.1038/nature08929 ↗
9. A jogged dislocation governed strengthening mechanism in nanotwinned metals10.1021/nl501755q ↗
10. Strengthening mechanisms of the nanolayered polycrystalline metallic multilayers assisted by twins10.1016/j.ijplas.2015.05.014 ↗
11. In-situ observation of cross-sectional microstructural changes and stress distributions in fracturing TiN thin film during nanoindentation10.1038/srep22670 ↗
12. Plastic deformation in nanocrystalline TiN at ultra-low stress: an in situ nanoindentation study10.1016/j.msea.2015.10.002 ↗
13. Molecular dynamics simulation of plasticity in VN(001) crystals under nanoindentation with a spherical indenter10.1016/j.apsusc.2016.09.130 ↗
14. First-principles calculation and molecular dynamics simulation of fracture behavior of VN layers under uniaxial tension10.1016/j.physe.2015.01.046 ↗
15. Molecular dynamics simulation of the slip systems in VN10.1039/C5RA15878H ↗
16. Molecular dynamics simulation of deformation twin in rocksalt vanadium nitride10.1016/j.jallcom.2016.03.069 ↗
17. Deformation mechanisms in Ti/TiN multilayer under compressive loading10.1016/j.actamat.2016.09.039 ↗
18. Synthesis, structure, thermal, transport and magnetic properties of VN ceramics10.1016/j.ceramint.2016.09.019 ↗
19. The microstructure and phase evolution of cone-like VN coating in a wide temperature range10.1016/j.surfcoat.2016.08.070 ↗
20. Neutron reflectometry investigations of interfacial structures of Ti/TiN layers deposited by magnetron sputtering10.1016/j.tsf.2016.08.064 ↗
21. Microstructure and nanoindentation hardness of Ti/TiN multilayered films10.1016/S0257-8972(00)01096-3 ↗
22. Microstructures, mechanical properties, and erosion resistance of unbalanced magnetron sputtering deposited TiN/VN nano-structured coatings10.1007/s13632-012-0025-9 ↗
23. Growth of single-crystal TiN/VN strained-layer superlattices with extremely high mechanical hardness10.1063/1.339770 ↗
24. Application of the embedded-atom method to covalent materials: a semiempirical potential for silicon10.1103/PhysRevLett.59.2666 ↗
25. Modified embedded-atom potentials for cubic materials and impurities10.1103/PhysRevB.46.2727 ↗
26. Semiempirical modified embedded-atom potentials for silicon and germanium10.1103/PhysRevB.40.6085 ↗
27. Modified embedded-atom potentials for cubic materials and impurities10.1103/PhysRevB.46.2727 ↗
28. Modified embedded-atom method interatomic potentials for Ti and Zr10.1103/PhysRevB.74.014101 ↗
29. Molecular dynamics simulation of VN thin films under indentation10.1016/j.apsusc.2015.09.024 ↗
30. Canonical dynamics: equilibrium phase-space distributions10.1103/PhysRevA.31.1695 ↗
31. Constant-pressure equations of motion10.1103/PhysRevA.34.2499 ↗
32. Fast parallel algorithms for short-range molecular-dynamics10.1006/jcph.1995.1039 ↗
33. Dislocation nucleation and defect structure during surface indentation10.1103/PhysRevB.58.11085 ↗
34. Molecular dynamics simulation of TiN (001) thin films under indentation10.1016/j.ceramint.2015.07.027 ↗
35. Structure identification methods for atomistic simulations of crystalline materials10.1088/0965-0393/20/4/045021 ↗
36. A crossover in the mechanical response of nanocrystalline ceramics10.1126/science.1114411 ↗
37. Elasticity and anelasticity of metals10.1021/j150474a017 ↗
38. An investigation of the combined size and rate effects on the mechanical responses of FCC metals10.1016/j.ijsolstr.2006.06.008 ↗
39. Strain hardening and strain rate effects in the impact loading of cantilever beams
40. Tensile and fracture process of the TiN/VN interface from first principles10.1016/j.ceramint.2014.07.016 ↗
41. Hardness and strain rate sensitivity of nanocrystalline Cu10.1016/j.scriptamat.2006.02.022 ↗
42. Effect of nanocrystalline and ultrafine grain sizes on the strain rate sensitivity and activation volume: fcc versus bcc metals10.1016/j.msea.2004.03.064 ↗
43. Activation volume and density of mobile dislocations in plastically deforming nanocrystalline Ni10.1063/1.1946899 ↗
44. Tension-compression asymmetry in nanocrystalline Cu: high strain rate vs. quasi-static deformation10.1016/j.commatsci.2010.05.004 ↗
45. Tension-compression asymmetry and size effects in nanocrystalline Ni nanowires10.1080/14786430701361404 ↗
46. Molecular dynamics simulation of AlN thin films under nanoindentation10.1016/j.ceramint.2016.11.218 ↗
47. Nanoindentation of ultra-hard cBN films: a molecular dynamics study10.1016/j.apsusc.2016.09.037 ↗
48. Crystal orientation effect on dislocation nucleation and multiplication in FCC single crystal under uniaxial loading10.1016/j.ijplas.2013.04.010 ↗