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

Authors

Linqing Pei, University of WollongongFollow
Cheng Lu, University of WollongongFollow
A Kiet Tieu, University of WollongongFollow
Xing Zhao, University of WollongongFollow
Liang Zhang, University of WollongongFollow
Kuiyu Cheng, University of WollongongFollow

RIS ID

102290

Publication Details

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.

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.