Chapter 10. High Temperature Creep Deformation of Al2O3-Based Eutectic Ceramics Grown by the Laser Heated Float Zone Method

  1. Rajan Tandon,
  2. Andrew Wereszczak and
  3. Edgar Lara-Curzio
  1. J. Ramirez-Rico1,
  2. A. R. Pinto-Góomez1,
  3. J. Martinez-Fernáandez1,
  4. R. De Arellano-Lóopez1,
  5. V. M. Orera2,
  6. R. I. Merino2 and
  7. J. I. Peñna2

Published Online: 27 MAR 2008

DOI: 10.1002/9780470291313.ch10

Mechanical Properties and Performance of Engineering Ceramics II: Ceramic Engineering and Science Proceedings, Volume 27, Issue 2

Mechanical Properties and Performance of Engineering Ceramics II: Ceramic Engineering and Science Proceedings, Volume 27, Issue 2

How to Cite

Ramirez-Rico, J., Pinto-Góomez, A. R., Martinez-Fernáandez, J., De Arellano-Lóopez, R., Orera, V. M., Merino, R. I. and Peñna, J. I. (2006) High Temperature Creep Deformation of Al2O3-Based Eutectic Ceramics Grown by the Laser Heated Float Zone Method, in Mechanical Properties and Performance of Engineering Ceramics II: Ceramic Engineering and Science Proceedings, Volume 27, Issue 2 (eds R. Tandon, A. Wereszczak and E. Lara-Curzio), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470291313.ch10

Author Information

  1. 1

    Departamento de Fisica de la Materia Condensada Centro mixto Universidad de Sevilla–CSIC 41080 Sevilla, Spain

  2. 2

    Instituto de Ciencia de Materiales de Aragóon, CSIC 50009 Zaragoza, Spain

Publication History

  1. Published Online: 27 MAR 2008
  2. Published Print: 1 JAN 2006

ISBN Information

Print ISBN: 9780470080528

Online ISBN: 9780470291313

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Keywords:

  • observations;
  • transmission electron microscopy (TEM);
  • scanning electron microscopy (SEM);
  • crystallographic;
  • interphase

Summary

Creep behavior of Al2O3–Zr02, Al2O3–YAG and Al2O3–Zr02–YAG directionally solidified eutectic ceramics fabricated at different growth rates has been studied. Both constant stress (creep) tests and constant cross–head speed tests have been performed to study high temperature plastic deformation. Their microstructure has been studied by means of SEM and TEM, both in as–fabricated and in deformed specimens. Our results show that active plastic deformation mechanisms depend on the microstructure by means of the lamellar size. A diffusional creep regime is observed for samples fabricated at high growth rates, and thus with smaller lamellae, at low stresses. As lamellar size increases a dislocation–based mechanism is observed, which is evidenced by observed creep exponents ranging from 3 to 5 and confirmed by microstructural observations. We propose a mixed diffusional–dislocation mechanism to explain the plastic behavior of these materials attending to their microstructural parameters.