Relationship between fracture toughness and phase assemblage in Mg-PSZ

Journal Article · Mon Jan 31 23:00:00 EST 1994 · Journal of the American Ceramic Society; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1994.tb07031.x· OSTI ID:7207475

Hannink, R H.J.; Swain, M V ^[1]; Howard, C J; Kisi, E H ^[2]

---

1. CSIRO, Clayton, Victoria (Australia). Division of Materials Science and Technology
2. Australian Nuclear Science and Technology Organization, Menai, New South Wales (Australia)

The phase content, size, and distribution have a marked effect on the thermomechanical properties of a 9 mol% MgO-ZrO[sub 2] (Mg-PSZ) alloy. The work undertaken in this study is the first investigation the simultaneously measure and characterize the quantitative bulk phase contents and correlate these parameters to the fracture toughness and R-curve behavior of a variously aged Mg-PSZ alloy. Quantitative bulk phase characterization entailed a systematic evaluation using neutron diffraction. In addition, microscopy techniques were used to determine the phase distribution and assemblage. The results indicate that the maximum toughness is attained, for a constant tetragonal precipitate size, when the anion-ordered [delta]-phase (Mg[sub 2]Zr[sub 5]O[sub 12]) replaces a major portion of the cubic matrix phase after an 1,100 C aging treatment. The shape of the R-curve and the stress required to transform the tetragonal precipitates are also significantly influenced by the [delta]-phase content.

• OSTI ID: 7207475
• Journal Information: Journal of the American Ceramic Society; (United States), Journal Name: Journal of the American Ceramic Society; (United States) Vol. 77:2; ISSN 0002-7820; ISSN JACTAW
• 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
ALKALINE EARTH METAL COMPOUNDS
CHALCOGENIDES
FRACTURE PROPERTIES
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MECHANICAL PROPERTIES
OXIDES
OXYGEN COMPOUNDS
PHASE STUDIES
PHASE TRANSFORMATIONS
TRANSITION ELEMENT COMPOUNDS
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES