Analysis of toughening of magnesia partially stabilized zirconia, due to dilatational transformation

Journal Article · Mon Jun 01 04:00:00 EDT 1992 · Acta Metallurgica; (United States)

DOI:https://doi.org/10.1016/0956-7151(92)90444-J· OSTI ID:7048318

Okada, H; Tamura, T; Ramakrishnan, N; Atluri, S N ^[1]; Epstein, J S ^[2]

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1. Georgia Inst. of Tech., Atlanta, GA (United States)
2. Idaho National Engineering Lab., Idaho Falls, ID (United States)

An analysis of toughening of magnesia partially stabilized zirconia (Mg-PSZ) due to dilatational transformation is presented in this paper. Transformation toughening of Mg-PSZ is attributed to the stress-induced phase transformation of tetragonal zirconia to monoclinic structure in the neighborhood of a macro-crack tip. A rate (incremental) type constitutive model is developed, using a micromechanics approach, wherein the interaction between a transformed zirconia particle and the rest of the material is considered. Problems of stationary and stably propagation cracks are analyzed, using a finite element method. The results of finite element analysis are compared to those of an experimental study by Perry et al. In the comparison, it is found that the displacement field and toughness enhancement during stable crack propagation, predicted by the finite element analysis are very analogous to those obtained in the experimental study. Moreover, the present constitutive model is capable of revealing detailed information, such as the distribution of transformed zirconia in the wake zone.

• OSTI ID: 7048318
• Journal Information: Acta Metallurgica; (United States), Journal Name: Acta Metallurgica; (United States) Vol. 40:6; ISSN 0001-6160; ISSN AMETA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360203* -- Ceramics
Cermets
& Refractories-- Mechanical Properties
360205 -- Ceramics
Cermets
& Refractories-- Corrosion & Erosion
99 GENERAL AND MISCELLANEOUS
990200 -- Mathematics & Computers
ALLOYS
CALCULATION METHODS
CHALCOGENIDES
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
CORROSION
CRACK PROPAGATION
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DATA
EXPERIMENTAL DATA
FINITE ELEMENT METHOD
FRACTURE MECHANICS
INFORMATION
MAGNESIUM ADDITIONS
MAGNESIUM ALLOYS
MECHANICS
NUMERICAL DATA
NUMERICAL SOLUTION
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
STRESS CORROSION
TETRAGONAL LATTICES
TRANSITION ELEMENT COMPOUNDS
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES