Abstract
The tetragonal-to-monoclinic (T → M) phase transformation accompanied with thermal cycling has been studied by ionic conductivity, dilatation and X-ray diffraction measurements. With repeating thermal cycling, theM s point shifts to a higher temperature, the amount of expansion due to T → M transformation increases, and the transformation proceeds from the surface in the specimen interiors. These phenomena are attributed to grain boundary cracking which occurs as a result of the transformation. The time-transformation isotherms at 353 K and at room temperature can be expressed by the Johnson-Mehl equationf=1−exp(−bt n), and the samen value of 0.7 was obtained irrespective of grain size and of environment.
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Tsubakino, H., Hamamoto, M. & Nozato, R. Tetragonal-to-monoclinic phase transformation during thermal cycling and isothermal ageing in yttria-partially stabilized zirconia. J Mater Sci 26, 5521–5526 (1991). https://doi.org/10.1007/BF02403953
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DOI: https://doi.org/10.1007/BF02403953