Instability of crack propagation in brittle bulk metallic glass

G. Wang, Kang Cheung Chan, X. H. Xu, W. H. Wang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

47 Citations (Scopus)

Abstract

The instability of the crack tip in brittle Mg-based bulk metallic glass (BMG) is studied. The formation of various fractographic surfaces of the BMG is associated with the instability of the fluid meniscus, which is due to viscous fluid matter being present on the fracture process zone. Depending on the values of the wavelength of the initial perturbation of the fluid meniscus and the local stress intensity factor, different fracture surface profiles, i.e. a dimple-like structure, a periodic corrugation pattern and a pure mirror zone are formed. The fractogaphic evolution is significantly affected by the applied stress. A decreased fracture surface roughness is observed under a low applied stress. An increased fracture surface roughness, which has frequently been reported by other researchers, is also observed in the present studies under a high applied stress. Unique fractographic features are attributed to the non-linear hyperelastic stiffening (or less softening) mechanism.
Original languageEnglish
Pages (from-to)5845-5860
Number of pages16
JournalActa Materialia
Volume56
Issue number19
DOIs
Publication statusPublished - 1 Nov 2008

Keywords

  • Atomic force microscopy
  • Fracture
  • Metallic glasses
  • Scanning electron microscopy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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