Diffusional cubic-to-tetragonal phase transformation and microstructural evolution in ZrO2-Y2O3 ceramics

Abstract

The diffusional cubic-to-tetragonal (c-t) phase transformation and microstructural evolution were studied on ZrO2-Y2O3 ceramics with 4 to 6 mol% Y2O3 annealed in the two phase (c + t) region for longer periods of time. It was shown that in early stages of annealing a “tweed” structure of t-ZrO2 was developed. With increasing annealing time this tweed structure becomes coarser and changes into internally twinned “colony” structure. The “colonies” can grow to large sizes but their twin-spacing remains almost constant. The effect of increasing annealing temperature was shown to be more obvious than prolonging annealing time in the transition from tweed to colony structure. The mechanism of the diffusional c-t transformation was discussed.

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Zhou, Y., Ge, Q.L., Lei, T.C. et al. Diffusional cubic-to-tetragonal phase transformation and microstructural evolution in ZrO2-Y2O3 ceramics. J Mater Sci 26, 4461–4467 (1991). https://doi.org/10.1007/BF00543668

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Keywords

  • Polymer
  • Phase Transformation
  • Y2O3
  • Annealing Time
  • Microstructural Evolution