Skip to main content
placeholder image

Effect of Temperature on Deformation and Fracture Behaviour of Nanostructured Polycrystalline Ni Under Tensile Hydrostatic Stress by Molecular Dynamics Simulation

Journal Article


Abstract


  • Real materials have structural defects that are normally brought in during the processes of manufacturing

    and storage and often have a structure with abundant grains, as well as being subjected

    to multi-directional force conditions. The study of temperature’s effect on plastic deformation mechanisms

    in polycrystalline materials bathed by a multi-axial force is still very rare and not clear.

    Therefore, we conducted very large-scale molecular dynamics simulations to study the deformation

    and fracture behaviour of nanostructured polycrystalline Ni under a pre-existing external tensile

    hydrostatic stress with various temperatures. By characterizing the deformation and fracture mechanisms

    at an atomic scale, our results elucidate the effect of temperature on brittle versus ductile

    fracture behaviour by analysing the local stresses for void nucleation and crack propagation and

    the associated interplays of grain boundary, dislocation/twin and void/crack activities. The lower

    temperature results in a more brittle fracture manner. This is because the decreasing temperatures

    contribute to more sources of local stress concentrators for void/crack nucleation and propagation,

    and suppress the plastic deformation achieved by the activities of grain boundary, twin and

    dislocation. Our findings shed a light on a fundamental understanding of polycrystalline Ni metals

    subjected to complex working environments.

Authors


  •   Pei, Linqing (external author)
  •   Lu, Cheng
  •   Tang, Qian (external author)
  •   Zhang, Yuanxun (external author)
  •   Li, Jiaqing (external author)
  •   Zhang, Che (external author)
  •   Zhao, Xing (external author)
  •   Tieu, A Kiet.

Publication Date


  • 2019

Citation


  • Pei, L., Lu, C., Tang, Q., Zhang, Y., Li, J., Zhang, C., Zhao, X. & Tieu, K. (2019). Effect of Temperature on Deformation and Fracture Behaviour of Nanostructured Polycrystalline Ni Under Tensile Hydrostatic Stress by Molecular Dynamics Simulation. Journal Of Nanoscience And Nanotechnology, 19 (5), 2723-2731.

Number Of Pages


  • 8

Start Page


  • 2723

End Page


  • 2731

Volume


  • 19

Issue


  • 5

Place Of Publication


  • United States

Abstract


  • Real materials have structural defects that are normally brought in during the processes of manufacturing

    and storage and often have a structure with abundant grains, as well as being subjected

    to multi-directional force conditions. The study of temperature’s effect on plastic deformation mechanisms

    in polycrystalline materials bathed by a multi-axial force is still very rare and not clear.

    Therefore, we conducted very large-scale molecular dynamics simulations to study the deformation

    and fracture behaviour of nanostructured polycrystalline Ni under a pre-existing external tensile

    hydrostatic stress with various temperatures. By characterizing the deformation and fracture mechanisms

    at an atomic scale, our results elucidate the effect of temperature on brittle versus ductile

    fracture behaviour by analysing the local stresses for void nucleation and crack propagation and

    the associated interplays of grain boundary, dislocation/twin and void/crack activities. The lower

    temperature results in a more brittle fracture manner. This is because the decreasing temperatures

    contribute to more sources of local stress concentrators for void/crack nucleation and propagation,

    and suppress the plastic deformation achieved by the activities of grain boundary, twin and

    dislocation. Our findings shed a light on a fundamental understanding of polycrystalline Ni metals

    subjected to complex working environments.

Authors


  •   Pei, Linqing (external author)
  •   Lu, Cheng
  •   Tang, Qian (external author)
  •   Zhang, Yuanxun (external author)
  •   Li, Jiaqing (external author)
  •   Zhang, Che (external author)
  •   Zhao, Xing (external author)
  •   Tieu, A Kiet.

Publication Date


  • 2019

Citation


  • Pei, L., Lu, C., Tang, Q., Zhang, Y., Li, J., Zhang, C., Zhao, X. & Tieu, K. (2019). Effect of Temperature on Deformation and Fracture Behaviour of Nanostructured Polycrystalline Ni Under Tensile Hydrostatic Stress by Molecular Dynamics Simulation. Journal Of Nanoscience And Nanotechnology, 19 (5), 2723-2731.

Number Of Pages


  • 8

Start Page


  • 2723

End Page


  • 2731

Volume


  • 19

Issue


  • 5

Place Of Publication


  • United States