The superplastic deformation behavior of fine‐grained, yttria‐stabilized tetragonal zirconia under conditions of biaxial gas‐pressure deformation is described. Sheet specimens were deformed into hemispherical caps at temperatures ranging from 1450° to 1600°C and at imposed gas pressures ranging from 345 to 2760 kPa. For the forming conditions examined, hemispherical caps were formed at times ranging from 2 to 476 min. A gas‐pressure‐forming apparatus used to conduct the experiments is described and a mechanical analysis of the deformation process is presented. Also discussed is the role of grain growth and the relationship between data obtained in uniaxial testing and the behavior observed during the biaxial deformation experiments of this study. A comparison is made between the observed thickness distribution in the hemispherical caps with predictions from an analytical model.
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Wittenauer et al. (1993) studied this question.
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