Chapter 86. Analysis of a Crept Sapphire Fiber

  1. John B. Wachtman Jr.
  1. O. Unal,
  2. K. P. D. Lagerlof and
  3. G. S. Corman

Published Online: 28 MAR 2008

DOI: 10.1002/9780470314180.ch86

Proceedings of the 17th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2: Ceramic Engineering and Science Proceedings, Volume 14, Issue 7/8

Proceedings of the 17th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2: Ceramic Engineering and Science Proceedings, Volume 14, Issue 7/8

How to Cite

Unal, O., Lagerlof, K. P. D. and Corman, G. S. (1993) Analysis of a Crept Sapphire Fiber, in Proceedings of the 17th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2: Ceramic Engineering and Science Proceedings, Volume 14, Issue 7/8 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470314180.ch86

Author Information

  1. Case Western Reserve University, Cleveland, OH

Publication History

  1. Published Online: 28 MAR 2008
  2. Published Print: 1 JAN 1993

ISBN Information

Print ISBN: 9780470375266

Online ISBN: 9780470314180

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Keywords:

  • parameters;
  • microstructural;
  • evaluation;
  • variable;
  • deformation

Summary

The steady state creep rate of a c-axis oriented sapphire fiber was measured and described by the equation of ϵ = 2.35×10−76.05 e(-507kJ/mol/RT) over the temperature and stress ranges of 1400°C to 1800°C and 100 to 400MPa, respectively. Microstructural analysis of a deformed fiber by SEM and TEM showed distinct slip steps as a result of the deformation process. Analysis revealed that primary dislocations with 1/3<1101> Burgers vectors glide on {1102} and {1123} pyramidal planes*. Secondary dislocations having 1/3<1120> Burgers vectors formed on the basal plane as a result of dislocation reactions on the pyramidal planes. Activation parameters and microstructural observations indicate that dislocation climb controlled the overall deformation process.