Transformation Zone Shape Effects on Crack Shielding in Ceria-Partially-Stabilized Zirconia (Ce-TZP)–Alumina Composites |
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| Authors: | Cheng-Sheng Yu Dinesh K Shetty Michael C Shaw David B Marshall |
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| Affiliation: | Department of Materials Science and Engineering, University of Utah, Salt Lake City, Utah 84112;Rockwell International Science Center, Thousand Oaks, California 91360 |
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| Abstract: | Crack tip shielding is evaluated for observed transformation zones in Ce-TZP/Al2O3 composites, in which the transformation zone sizes were changed significantly by varying the sintering temperature to control the transformation yield stress. The calculated shielding effects are consistent with an observed insensitivity of crack resistance curves to transformation zone size; smaller zones in materials with higher yield stress were associated with larger ratios of wake length to zone width and correspondingly higher normalized shielding stress intensity factors. Shielding due to the dilatational component of the transformation strain accounted for most of the toughening observed in these materials. |
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