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Molecular dynamics simulation on generalized stacking fault energies of FCC metals under preloading stress

Journal Article


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Abstract


  • Molecular dynamics (MD) simulations are performed to investigate the effects of stress on generalized stacking fault (GSF) energy of three fcc metals (Cu, Al, and Ni). The simulation model is deformed by uniaxial tension or compression in each of [111], [11-2], and [1-10] directions, respectively, before shifting the lattice to calculate the GSF curve. Simulation results show that the values of unstable stacking fault energy (γusf), stable stacking fault energy (γsf), and unstable twin fault energy (γutf) of the three elements can change with the preloaded tensile or compressive stress in different directions. The ratio of γsfusf, which is related to the energy barrier for full dislocation nucleation, and the ratio of γutfusf, which is related to the energy barrier for twinning formation are plotted each as a function of the preloading stress. The results of this study reveal that the stress state can change the energy barrier of defect nucleation in the crystal lattice, and thereby can play an important role in the deformation mechanism of nanocrystalline material.

Publication Date


  • 2015

Citation


  • Zhang, L., Lu, C., Tieu, K., Zhao, X., Pei, L. & Michal, G. (2015). Molecular dynamics simulation on generalized stacking fault energies of FCC metals under preloading stress. Chinese Physics B, 24 (8), 088106-1-088106-8.

Scopus Eid


  • 2-s2.0-84939182803

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=5307&context=eispapers

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/4286

Start Page


  • 088106-1

End Page


  • 088106-8

Volume


  • 24

Issue


  • 8

Abstract


  • Molecular dynamics (MD) simulations are performed to investigate the effects of stress on generalized stacking fault (GSF) energy of three fcc metals (Cu, Al, and Ni). The simulation model is deformed by uniaxial tension or compression in each of [111], [11-2], and [1-10] directions, respectively, before shifting the lattice to calculate the GSF curve. Simulation results show that the values of unstable stacking fault energy (γusf), stable stacking fault energy (γsf), and unstable twin fault energy (γutf) of the three elements can change with the preloaded tensile or compressive stress in different directions. The ratio of γsfusf, which is related to the energy barrier for full dislocation nucleation, and the ratio of γutfusf, which is related to the energy barrier for twinning formation are plotted each as a function of the preloading stress. The results of this study reveal that the stress state can change the energy barrier of defect nucleation in the crystal lattice, and thereby can play an important role in the deformation mechanism of nanocrystalline material.

Publication Date


  • 2015

Citation


  • Zhang, L., Lu, C., Tieu, K., Zhao, X., Pei, L. & Michal, G. (2015). Molecular dynamics simulation on generalized stacking fault energies of FCC metals under preloading stress. Chinese Physics B, 24 (8), 088106-1-088106-8.

Scopus Eid


  • 2-s2.0-84939182803

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=5307&context=eispapers

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/4286

Start Page


  • 088106-1

End Page


  • 088106-8

Volume


  • 24

Issue


  • 8