Chapter 14. Crystallography of Alumina-YAG Eutectic

  1. Todd Jessen and
  2. Ersan Ustundag
  1. S. C. Farmer1,
  2. Ali Sayir1,
  3. Robert M. Dickerson2 and
  4. Lawrence E. Matson3

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294628.ch14

24th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 21, Issue 3

24th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 21, Issue 3

How to Cite

Farmer, S. C., Sayir, A., Dickerson, R. M. and Matson, L. E. (2000) Crystallography of Alumina-YAG Eutectic, in 24th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 21, Issue 3 (eds T. Jessen and E. Ustundag), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294628.ch14

Author Information

  1. 1

    NASA Glenn Research Center 21000 Brookpark Rd. Cleveland, OH 44135

  2. 2

    Materials Science and Technology Div., Los Alanios National Laboratory, Los Alamos, NM 87545

  3. 3

    WL/MLLM Wright-Patterson AFB Dayton, OH

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 2000

ISBN Information

Print ISBN: 9780470375686

Online ISBN: 9780470294628

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Keywords:

  • residual stress;
  • zirconia thermal barrier coatings;
  • local interface geometry;
  • oxide scale growth;
  • microstructure

Summary

Multiple descriptions of the alumina-YAG eutectic crystallography appear in the ceramic literature. The orientation between two phases in a eutectic system has direct impact on residual stress, morphology, microstructural stability, and high temperature mechanical properties. A study to demonstrate that the different crystallographic relationships can be correlated with different growth constraints was undertaken. Fibers produced by Laser-Heated Float Zone (LHFZ) and Edge-defined Film-fed Growth (EFG) were examined. A map of the orientation relationship between Al2O3 and Y3Al5O12 and their relationship to the fiber growth axis as a function of pull rate are presented. Regions in which a single orientation predominates are identified.