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Formation of metastable t′ -phase in solute-redistributed Y-PSZ

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Abstract

Owing to solute redistribution by a liquid phase analogue of diffusion-induced grain-boundary migration metastable and anti-phase domain boundary-bearing tetragonal (t′) phase was seen to occur in the cubic (c) matrix grain of sintered (1400 °C, 2 h) and furnace-cooled yttriapartially stabilized zirconia (Y-PSZ) specimens (TZ3Y + 12Y-PSZ in molar ratios of 4:1, 1:1 and 1∶4). In contrast to that formed by rapid cooling, t′-phase formed by slow cooling shows no deformation accommodation twins. Subsequent ageing at 1100 °C for up to 240 h caused the formation of finely tweed (c) and tetragonal (t) assemblages at the expense of coarse tweed t′-phase in the 12Y-PSZ grains. The absence of secondary deformation twins in the t′-phase formed by slow cooling is discussed.

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Authors and Affiliations

  1. Institute of Materials Science and Engineering, National Sun Yat-Sen University, Kaohsiung, Taiwan

    S. J. Lin, H. Y. Lu & P. Shen

Authors
  1. S. J. Lin
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  2. H. Y. Lu
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  3. P. Shen
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Lin, S.J., Lu, H.Y. & Shen, P. Formation of metastable t′ -phase in solute-redistributed Y-PSZ. J Mater Sci 26, 112–116 (1991). https://doi.org/10.1007/BF00576040

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  • DOI: https://doi.org/10.1007/BF00576040

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