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Tension/compression asymmetry of grain boundaries with non-planar structure

Journal Article


Abstract


  • Molecular dynamics simulations were carried out to investigate the mechanical property and the

    deformation mechanisms of Cu bicrystal with non-planar structured grain boundaries(GBs) under

    uniaxial tension and compression. The simulation results showed that the non-planar GBs could

    change their equilibrium configurations under the applied stress, and the deformation mechanisms

    varied when altering the misorientation angle. The stacking fault energy curve was affected by the

    stress perpendicular to the slip plane and therefore has an influence on the dislocation nucleation

    mechanisms. Previous studies have revealed a ubiquitous tension/compression (T/C)strength

    asymmetry of many ultra-fine or nanocrystalline materials, and a higher compressive strength was

    usually reported. However, in the present study, the bicrystal samples with non-planar structured GBs

    show a higher tensile strength than the compressive one. The unusual T/C asymmetry property has an

    implication that the GBs with non-planar structure can play a significant role in affecting the

    mechanical properties of nanostructured materials.

Publication Date


  • 2016

Citation


  • Zhang, L., Lu, C., Tieu, K., Michal, G., Zhang, J. & Deng, G. (2016). Tension/compression asymmetry of grain boundaries with non-planar structure. Materials Research Express, 3 (8), 1-11.

Scopus Eid


  • 2-s2.0-84987681490

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/6082

Has Global Citation Frequency


Number Of Pages


  • 10

Start Page


  • 1

End Page


  • 11

Volume


  • 3

Issue


  • 8

Place Of Publication


  • United Kingdom

Abstract


  • Molecular dynamics simulations were carried out to investigate the mechanical property and the

    deformation mechanisms of Cu bicrystal with non-planar structured grain boundaries(GBs) under

    uniaxial tension and compression. The simulation results showed that the non-planar GBs could

    change their equilibrium configurations under the applied stress, and the deformation mechanisms

    varied when altering the misorientation angle. The stacking fault energy curve was affected by the

    stress perpendicular to the slip plane and therefore has an influence on the dislocation nucleation

    mechanisms. Previous studies have revealed a ubiquitous tension/compression (T/C)strength

    asymmetry of many ultra-fine or nanocrystalline materials, and a higher compressive strength was

    usually reported. However, in the present study, the bicrystal samples with non-planar structured GBs

    show a higher tensile strength than the compressive one. The unusual T/C asymmetry property has an

    implication that the GBs with non-planar structure can play a significant role in affecting the

    mechanical properties of nanostructured materials.

Publication Date


  • 2016

Citation


  • Zhang, L., Lu, C., Tieu, K., Michal, G., Zhang, J. & Deng, G. (2016). Tension/compression asymmetry of grain boundaries with non-planar structure. Materials Research Express, 3 (8), 1-11.

Scopus Eid


  • 2-s2.0-84987681490

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/6082

Has Global Citation Frequency


Number Of Pages


  • 10

Start Page


  • 1

End Page


  • 11

Volume


  • 3

Issue


  • 8

Place Of Publication


  • United Kingdom