Toughening of brittle solids by martensitic transformations
A review of toughening mechanisms in transformable brittle solids is presented. Primary emphasis is given to transformation toughening, although microcrack and deflection toughening are also considered. Models of toughness are developed using concepts from applied mechanics, but within the context of the thermodynamics and kinetics of the transformation process. The predictions are compared with experimental data for various ZrO/sub 2/ containing ceramic alloys. The predominant toughening mechanism depends on composition and microstructure; dilatational transformation toughening with shear modifications dominates in partially stabilized zirconia; uniaxial transformation and microcrack mechanisms prevail in zirconia alumina; transformation toughening with partial reversibility in tetragonal zirconia polycrystals.
- Research Organization:
- College of Engineering, Univ. of California, Santa Barbara, CA (US)
- OSTI ID:
- 6964794
- Journal Information:
- Acta Metall.; (United States), Journal Name: Acta Metall.; (United States) Vol. 34:5; ISSN AMETA
- Country of Publication:
- United States
- Language:
- English
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ALLOYS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
BRITTLENESS
CARBON ADDITIONS
CERAMICS
CHALCOGENIDES
CHEMICAL COMPOSITION
CHEMICAL REACTION KINETICS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTAL-PHASE TRANSFORMATIONS
CRYSTALS
FRACTURE MECHANICS
FRACTURE PROPERTIES
IRON ALLOYS
KINETICS
MARTENSITE
MATHEMATICAL MODELS
MECHANICAL PROPERTIES
MECHANICS
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
POLYCRYSTALS
REACTION KINETICS
TETRAGONAL LATTICES
THERMODYNAMICS
TRANSITION ELEMENT COMPOUNDS
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES