Journal of the American Ceramic Society · 1987 · 333 citations · 22 references
Natural SciencesMaterials EngineeringMaterials ScienceCeramic MaterialsCeramicsMechanical Behavior Of MaterialsCeramic Toughening MechanismsFracture MechanicsFracture ToughnessStructural CeramicsThermal Properties Of CeramicsCeramic Fracture BehaviorCeramic Fracture ToughnessCrack PropagationCrack Propagation In CeramicsFracture Of CeramicsR-curve BehaviorStress Intensity FactorThermomechanical Behavior Of Ceramics
Transformation toughening in ZrO 2 ‐containing ceramics is discussed. Specifically, microstuctures of the three distinct types of ZrO 2 ‐toughened ceramics are presented, after which microstructural evolution in MgO‐partially‐stabilized ZrO 2 Mg‐PSZ) is reviewed. The mechanical properties of such transformation‐toughened ceramics are dominated by “resistance‐curve” ( R ‐curve) behavior, wherein the crack resistance increases during the course of crack propagation. Ceramics subject to R ‐curve behavior require a more detailed failure criterion than those subject to the usual linear elastic fracture mechanics criterion involving a critical stress intensity factor, K IC .R ‐curve‐controlled fracture in ceramics provides a degree of very desirable flaw insensitivity, but can lead to counterintuitive relationships concerning strength, toughness, and initial flaw size. Examples of R curves of Mg‐PSZ with different thermal histories are given.
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