Interfacial fracture phenomena in ceramic composite directionally solidified eutectics with a ductile interphase

Nasim Alem, Vinayak P. Dravid

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Interphase interfaces in NixCo1-xO/ZrO2(CaO) directionally solidified eutectics (DSEs) are modified by selective chemical reduction of the NixCo1-xO oxide phase. Scanning electron microscopy studies of such NixCo1-xO/ZrO2(CaO) DSEs show formation of a thin layer of metallic Ni(Co) interphase (B100nm) and interfacial porosity upon reduction at high temperatures. A significant change is observed in the mechanical behavior of the reduced NixCo1-xO/ZrO2(CaO) DSEs compared with its pristine counterpart, which is largely attributed to the formation of metallic Ni(Co) interphases. Indentation fracture studies indicate that the presence of metallic interphases in the DSEs enhance the stress energy release mechanism through plastic deformation, interfacial delamination, crack arrest, and crack bridging across the metallic interphase after reduction.

Original languageEnglish (US)
Pages (from-to)767-772
Number of pages6
JournalJournal of the American Ceramic Society
Volume89
Issue number2
DOIs
StatePublished - Feb 1 2006

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites

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