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Journal of Materials Science

, Volume 18, Issue 2, pp 457–470 | Cite as

Microstructural development of sub-eutectoid aged MgO-ZrO2 alloys

  • R. H. J. Hannink
Papers

Abstract

The microstructural development in fully and partially stabilized MgO-ZrO2 alloys during sub-eutectoid heat treatment at 1100° C, has been studied by optical and electron microscopy and powder X-ray diffraction in order to correlate the observed microstructures with the mechanical properties. The materials used were 14 mol % MgO-ZrO2 (Mg-CSZ) of eutectoid composition and 9 mol % MgO-ZrO2 (Mg-PSZ). In Mg-CSZ the decomposition reaction proceeds almost to completion before the maximum thermal up-shock properties are attained. For the Mg-PSZ material the most significant event leading to the enhanced mechanical properties appears to be the nucleation and growth of a long-range ordered anion vacancy phase within the cubic zirconia matrix. This, in turn, leads to the destabilization of the tetragonal ZrO2 precipitates also present in Mg-PSZ, causing some of them to acquire monoclinic intergrowths whilst others transform to the monoclinic form on cooling. Beyond about 4 h ageing at 1100° C the decomposition product in the grain boundaries began to influence the mechanical properties.

Keywords

Polymer Microstructure Microscopy Electron Microscopy Mechanical Property 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    “Science and Technology of Zirconia”, Advances in Ceramics, Vol. 3 edited by A. H. Heuer and L. W. Hobbs (The American Ceramic Society, Columbus, Ohio, 1981).Google Scholar
  2. 2.
    R. C. Garvie, R. H. J. Hannink andR. T. Pascoe,Nature 258 (1975) 703.Google Scholar
  3. 3.
    D. L. Porter andA. H. Heuer,J. Amer. Ceram. Soc. 60 (1977) 183.Google Scholar
  4. 4.
    M. V. Swain, R. H. J. Hannink andR. C. Garvie, Symposium on the Fracture Mechanics of Ceramics, Pennsylvania State University, July 1981, Vols. 5 and 6 (Plenum Press, New York) to be published.Google Scholar
  5. 5.
    N. Claussen andM. Ruhle, in “Science and Technology of Zirconia”, Advances in Ceramics, Vol. 3 edited by A. H. Heuer and L. W. Hobbs (The American Ceramic Society, Columbus, Ohio, 1981).Google Scholar
  6. 6.
    F. F. Lange, ONR Technical Report No. 7, Contract N 00014-77-C-0441, May (1979).Google Scholar
  7. 7.
    K. G. Bansal andA. H. Heuer,J. Amer. Ceram. Soc. 58 (1975) 235.Google Scholar
  8. 8.
    R. T. Pascoe, R. H. J. Hannink andR. C. Garvie,Sci. Ceram. 9 (1977) 447.Google Scholar
  9. 9.
    C. F. Grain,J. Amer. Ceram. Soc. 50 (1967) 288.Google Scholar
  10. 10.
    R. H. J. Hannink,J. Mater. Sci. 13 (1978) 2487.Google Scholar
  11. 11.
    E. Ryshkewitch, “Oxide Ceramics” (Academic Press, New York, 1970) p. 358.Google Scholar
  12. 12.
    D. L. Porter andA. H. Heuer,J. Amer. Ceram. Soc. 62 (1979) 298.Google Scholar
  13. 13.
    D. Viechnicki andV. S. Stubican,ibid. 48 (1965) 292.Google Scholar
  14. 14.
    B. Ya. Sukharevskii, A. M. Gavrish andE. I. Zoz,Inorg. Mater. 11 (1975) 393.Google Scholar
  15. 15.
    R.C. Garvie, R. H. J. Hannink andN. A. Mckinnon, US Patent No. 4279655 (1981).Google Scholar
  16. 16.
    R. H. J. Hannink andR. C. Garvie,J. Mater. Sci. 17 (1982) 2637.Google Scholar
  17. 17.
    M. V. Swain, Symposium on the Fracture Mechanics of Ceramics, Pennsylvania State University, July 1981, Vols. 5 and 6 (Plenum Press, New York) to be published.Google Scholar
  18. 18.
    M. V. Swain, R. C. Garvie andR. H. J. Hannink,J. Amer. Ceram. Soc. (1982) in press.Google Scholar
  19. 19.
    H. G. Scott, unpublished results.Google Scholar
  20. 20.
    R. H. J. Hannink andH. J. Rossell,Micron 11 Suppl. 1 (1980) 36 (abs).Google Scholar
  21. 21.
    P. B. Hirch, A. Howie, R. B. Nicholson, D. W. Pashley andM. J. Whelan, “Electron Microscopy of Thin Crystals” (Butterworths, London, 1965) Ch. 14.Google Scholar
  22. 22.
    W. J. Cambell andC. F. Grain, US Bur. Mines RI 5982 (1962).Google Scholar
  23. 23.
    L. H. Schoenlein, MSc thesis, Case Western Reserve University (1979).Google Scholar
  24. 24.
    D. L. Porter, PhD thesis, Case Western Reserve University, (1977).Google Scholar
  25. 25.
    L. M. Brown, G. R. Woolhouse andG. Valdré,Phil. Mag. 17 (1968) 781.Google Scholar
  26. 26.
    L. M. Brown andG. R. Woolhouse,ibid. 21 (1970) 329.Google Scholar
  27. 27.
    R. H. J. Hannink, unpublished results (1978).Google Scholar
  28. 28.
    H. J. Rossell, private communication (1981).Google Scholar
  29. 29.
    Csiro, unpublished results (1979).Google Scholar

Copyright information

© Chapman and Hall Ltd. 1983

Authors and Affiliations

  • R. H. J. Hannink
    • 1
  1. 1.Division of Materials Science, Advanced Materials LaboratoryCSIROMelbourneAustralia

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