Grain-size effect on high temperature fatigue crack growth in polycrystalline Al2O3

C. H. Huang, J. K. Shang, J. F. Stubbins

Research output: Contribution to journalConference articlepeer-review

Abstract

High temperature cyclic crack growth experiments were conducted on polycrystalline Al2O3 of different grain sizes. The effect of grain size depended on the level of applied stress intensity. At high stress intensifies, a larger grain size provided a superior crack growth resistance, similar to the effect of grain size on crack growth at room temperature. However, at low stress intensities, the grain-size dependence was reversed. While the effect of grain size at high stress intensities resulted from enhanced grain bridging in the coarse-grained microstructure, the behavior at low stress intensifies can be understood in terms of the higher grain boundary strength of the fine-grained structure.

Original languageEnglish (US)
Pages (from-to)642-650
Number of pages9
JournalCeramic Engineering and Science Proceedings
Volume15
Issue number5
StatePublished - Sep 1 1994
EventProceedings of the 18th Annual Conference on Composites and Advanced Ceramic Materials - B. Part 2 (of 2) - Cocoa Beach, FL, USA
Duration: Jan 9 1993Jan 14 1993

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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