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Role of Autocatalytic Transformation in Zone Shape and Toughening of Ceria–Tetragonal‐Zirconia–Alumina (Ce‐TZP/Al 2 O 3 ) Composites
Author(s) -
Tsai JingFong,
Yu ChengSheng,
Shetty Dinesh K.
Publication year - 1991
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.1151-2916.1991.tb04082.x
Subject(s) - materials science , composite material , autocatalysis , toughness , ceramic , composite number , yield (engineering) , tetragonal crystal system , fracture toughness , toughening , cubic zirconia , shear (geology) , crystallography , kinetics , crystal structure , chemistry , physics , quantum mechanics
Stress–strain behaviors in three‐point bending, transformation zones in single‐edge‐notch‐bend specimens, and transformation toughening were studied in two types of Ce‐TZP/Al 2 O 3 composites. A commercial grade exhibited yield‐point behavior triggered by autocatalytic transformation and elongated zones. A new grade of Ce‐TZP/Al 2 O 3 composite showed monotonic stress–strain behavior and a zone shape close to theoretical prediction based on a shear–dilatation yield criterion. The effects of zone sizes and shapes on fracture toughness of the two ceramic composites are shown to be qualitatively consistent with the predictions of transformation‐zone shielding theories.