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Transformation Zone Shape Effects on Crack Shielding in Ceria‐Partially‐Stabilized Zirconia (Ce‐TZP)–Alumina Composites
Author(s) -
Yu ChengSheng,
Shetty Dinesh K.,
Shaw Michael C.,
Marshall David B.
Publication year - 1992
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1992.tb04376.x
Subject(s) - materials science , composite material , electromagnetic shielding , cubic zirconia , yield (engineering) , sintering , shielding effect , stress intensity factor , stress (linguistics) , toughening , transformation (genetics) , fracture mechanics , ceramic , toughness , chemistry , linguistics , philosophy , biochemistry , gene
Crack tip shielding is evaluated for observed transformation zones in Ce‐TZP/Al 2 O 3 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.