Transformation Zone Shape Effects on Crack Shielding in Ceria-Partially-Stabilized Zirconia (Ce-TZP)-Alumina Composites

Autor:	Michael C. Shaw, Cheng Sheng Yu, David B. Marshall, Dinesh K. Shetty
Rok vydání:	1992
Předmět:	Aluminium oxides Fabrication Materials science Electromagnetic shielding Materials Chemistry Ceramics and Composites Hardening (metallurgy) Sintering Cubic zirconia Strain hardening exponent Composite material Stress intensity factor
Zdroj:	Journal of the American Ceramic Society. 75:2991-2994
ISSN:	1551-2916 0002-7820
DOI:	10.1111/j.1151-2916.1992.tb04376.x
Popis:	In this paper crack tip shielding is evaluated for observed transformation zones in Ce-TZP/Al[sub 2]O[sub 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.
Databáze:	OpenAIRE
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