Chapter 7. Grain-Size Effect on High Temperature Fatigue Crack Growth in Polycrystalline Al2O3

  1. John B. Wachtman Jr.
  1. C. H. Huang1,
  2. J. K. Shang1 and
  3. J. F. Stubb2

Published Online: 28 MAR 2008

DOI: 10.1002/9780470314555.ch7

Proceedings of the 18th Annual Conference on Composites and Advanced Ceramic Materials - B: Ceramic Engineering and Science Proceedings, Volume 15, Issue 5

Proceedings of the 18th Annual Conference on Composites and Advanced Ceramic Materials - B: Ceramic Engineering and Science Proceedings, Volume 15, Issue 5

How to Cite

Huang, C. H., Shang, J. K. and Stubb, J. F. (1994) Grain-Size Effect on High Temperature Fatigue Crack Growth in Polycrystalline Al2O3, in Proceedings of the 18th Annual Conference on Composites and Advanced Ceramic Materials - B: Ceramic Engineering and Science Proceedings, Volume 15, Issue 5 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470314555.ch7

Author Information

  1. 1

    Department of Materials Science and Engineering and Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL 61801

  2. 2

    Department of Nuclear Engineering, and Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL 61801

Publication History

  1. Published Online: 28 MAR 2008
  2. Published Print: 1 JAN 1994

ISBN Information

Print ISBN: 9780470375334

Online ISBN: 9780470314555

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Keywords:

  • cyclic crack growth experiments;
  • grain sizes;
  • microstructural development;
  • agglomerates of large grains;
  • coarse-grained microstructures

Summary

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 intensities, 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 intensities can be understood in terms of the higher grain boundary strength of the fine-grained structure.