Residual thermal stresses and calculation of the critical metal particle size for interfacial crack extension in metal-ceramic matrix composites

R. Kolhe, C. Y. Hui, E. Ustundag, S. L. Sass*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

42 Citations (Scopus)

Abstract

A combined experimental and theoretical study was carried out to analyze the effect of residual thermal stresses on the interfacial bonding in particulate metal-ceramic matrix composites, in particular, ductile phase toughened ceramics. The metal-ceramic microstructure studied is a two phase Ni/Al2O3 system produced by an in situ reduction processing technique. When a Ni particle exceeds the critical size, crack extension occurs along the particle/matrix interface upon cooling from the reduction temperature to room temperature. A closed form solution is derived for the case of thermal loading for the energy release rate and the phase angle for a crack along the interface of a cylindrical particle embedded in an infinite matrix. A theoretical estimate of the critical size for the nickel particle for crack extension is then computed based on the closed form solution and experimental data on the toughness of the Ni/Al2O3 interface.

Original languageEnglish
Pages (from-to)279-287
Number of pages9
JournalActa Materialia
Volume44
Issue number1
DOIs
Publication statusPublished - Jan 1996
Externally publishedYes

Funding

Acknowledgements-This research was supported by the Air Force Office of Scientific Research under Contract No. F49620-931-0235. The use of the electron microscopy, X-ray diffraction and material preparation facilities of the Material Science Center at Cornell University, funded by the National Science Foundation under Grant No. DMR-91-21564 is gratefully acknowledged.

FundersFunder number
National Science FoundationDMR-91-21564
Air Force Office of Scientific ResearchF49620-931-0235

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