Chapter 77. Phase Distribution, Residual Stresses and Mechanical Properties of Melt Growth Al2O3-ZrO2(Y2O3) Eutectics

  1. Hua-Tay Lin and
  2. Mrityunjay Singh
  1. R.I. Merino1,
  2. J.I. Peñia1,
  3. N.R. Harlan1,
  4. G.F. De La Fuente1,
  5. A. Larrea1,
  6. J.A. Pardo1,
  7. V.M. Orera1,
  8. J.Y. Pastor2,
  9. P. Poza2 and
  10. J. Llorca2

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294741.ch77

26th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 23, Issue 3

26th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 23, Issue 3

How to Cite

Merino, R.I., Peñia, J.I., Harlan, N.R., De La Fuente, G.F., Larrea, A., Pardo, J.A., Orera, V.M., Pastor, J.Y., Poza, P. and Llorca, J. (2002) Phase Distribution, Residual Stresses and Mechanical Properties of Melt Growth Al2O3-ZrO2(Y2O3) Eutectics, in 26th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 23, Issue 3 (eds H.-T. Lin and M. Singh), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294741.ch77

Author Information

  1. 1

    Instituto de Ciencia de Materiales de Aragón, C.S.I.C. - Universidad de Zaragoza, C/ Pedro Cerbuna 12, E-50009 Zaragoza, Spain

  2. 2

    Departamento de Ciencia de Materiales. Universidad Politécnica de Madrid, E.T.S. de Ingenieros de Caminos. 28040 Madrid

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 2002

ISBN Information

Print ISBN: 9780470375785

Online ISBN: 9780470294741

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Keywords:

  • mechanical properties;
  • microstructural stability;
  • diffraction;
  • microstructure;
  • flexural strength

Summary

Melt growth ceramic composites (MGC) exhibit excellent mechanical properties due to their low porosity, high microstructural stability and coherent interfaces. In the present paper rods and plates of Al2O3-ZrO2 eutectics containing 0–12 mol% Y2O2 (with respect to zirconia) were produced using the laser melt zone method. The relationship between microstructural features and growth parameters has been studied. The phase distribution of cubic, tetragonal and monoclinic zirconia in the eutectics was determined using Raman spectroscopy and X-ray diffraction. The residual stress was measured using the R-lines of the Cr3+ in the alumina phase. The alumina phase was found to be in tension at low yttria concentration and in compression at high yttria concentration.

The samples present excellent flexural strength (>lGPa) and high toughness (7.8 MPa m1/2) and maintained a very high strength up to 1600 K. The relationship between microstructure and mechanical properties was studied. The nature of the critical defects that led to the fracture and the toughening mechanisms are discussed in the light of the material microstructure.