Transformation toughening in ZrO/sub 2/-containing ceramics

Journal Article · Thu Oct 01 00:00:00 EDT 1987 · J. Am. Ceram. Soc.; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1987.tb04865.x· OSTI ID:5132199

Heuer, A H

Transformation toughening in ZrO/sub 2/-containing ceramics is discussed. Specifically, microstructures of the three distinct types of ZrO/sub 2/-toughened ceramics are presented, after which microstructural evolution in MgO-partially-stabilized ZrO/sub 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/sub IC/ . R-curve-controlled fracture in ceramics provides a degree of very desirable flaw insensitivity, but can lead to counter intuitive relationships concerning strength, toughness, and initial flaw size. Examples of R curves of MG-PSZ with different thermal histories are given.

• Research Organization: Dept. of Materials Science and Engineering, Case Western Reserve Univ., Cleveland, OH (US)
• OSTI ID: 5132199
• Journal Information: J. Am. Ceram. Soc.; (United States), Vol. 70:10
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
MAGNESIUM OXIDES
MICROHARDNESS
MICROSTRUCTURE
ZIRCONIUM OXIDES
QUANTITY RATIO
CERAMICS
CRACKS
CRYSTAL DOPING
ELASTICITY
ALKALINE EARTH METAL COMPOUNDS
CHALCOGENIDES
CRYSTAL STRUCTURE
HARDNESS
MAGNESIUM COMPOUNDS
MECHANICAL PROPERTIES
OXIDES
OXYGEN COMPOUNDS
TENSILE PROPERTIES
TRANSITION ELEMENT COMPOUNDS
ZIRCONIUM COMPOUNDS
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