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Ductile-to-brittle fracture transition in polycrystalline nickel under tensile hydrostatic stress

Journal Article


Abstract


  • Large-scale molecular dynamics (MD) simulation was used to study the tensile deformation and failure of defective polycrystalline Ni at various external tensile hydrostatic stresses. A ductile-to-brittle fracture transition occurred. This fracture transition was attributed to the active void and crack propagations, and the suppressed activities of grain boundary (GB) and dislocation from the extra tensile hydrostatic stress applied. Moreover, this interplay between dislocation and GB can occur as dislocation emissions, trapping, absorption, and reflection and transmission, but these forms depend mainly on the local stress states and local geometric structures.

Publication Date


  • 2015

Citation


  • Pei, L., Lu, C., Tieu, K., Zhao, X., Zhang, L. & Cheng, K. (2015). Ductile-to-brittle fracture transition in polycrystalline nickel under tensile hydrostatic stress. Computational Materials Science, 109 147-156.

Scopus Eid


  • 2-s2.0-84937961846

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/4277

Number Of Pages


  • 9

Start Page


  • 147

End Page


  • 156

Volume


  • 109

Abstract


  • Large-scale molecular dynamics (MD) simulation was used to study the tensile deformation and failure of defective polycrystalline Ni at various external tensile hydrostatic stresses. A ductile-to-brittle fracture transition occurred. This fracture transition was attributed to the active void and crack propagations, and the suppressed activities of grain boundary (GB) and dislocation from the extra tensile hydrostatic stress applied. Moreover, this interplay between dislocation and GB can occur as dislocation emissions, trapping, absorption, and reflection and transmission, but these forms depend mainly on the local stress states and local geometric structures.

Publication Date


  • 2015

Citation


  • Pei, L., Lu, C., Tieu, K., Zhao, X., Zhang, L. & Cheng, K. (2015). Ductile-to-brittle fracture transition in polycrystalline nickel under tensile hydrostatic stress. Computational Materials Science, 109 147-156.

Scopus Eid


  • 2-s2.0-84937961846

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/4277

Number Of Pages


  • 9

Start Page


  • 147

End Page


  • 156

Volume


  • 109