Interfacial fracture mechanisms in solid solution directionally solidified eutectic oxide composites

L. N. Brewer, M. U. Guruz, Vinayak P Dravid*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

The interfacial fracture behavior of the solid solution directionally solidified eutectic oxide, Co 1-xNi xO/ZrO 2(CaO), is investigated via indentation testing. An abrupt transition from interfacial delamination to interfacial penetration is observed as a function of NiO fraction (x>0.33). The use of a focused ion beam technique is introduced as a means for exploring sub-surface cracking in brittle materials. The sub-surface observations revealed a compositional transition from energy dissipative mechanisms (e.g., delamination, secondary cracking) for cracking to brittle cracking behavior, in the Co 1-xNi xO phase. It is proposed that the transition in interfacial fracture behavior for the directionally solidified eutectic material is the result of competing dislocation-based crack nucleation mechanisms. The observations and analyses have significant implications for fracture behavior in composites with one phase exhibiting (pseudo-) plastic behavior.

Original languageEnglish (US)
Pages (from-to)3781-3791
Number of pages11
JournalActa Materialia
Volume52
Issue number13
DOIs
StatePublished - Aug 2 2004

Keywords

  • Eutectic
  • Focused ion beam
  • Fracture
  • Indentation
  • Interfaces

ASJC Scopus subject areas

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

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