Phase equilibration in ZrO/sub 2/-Y/sub 2/O/sub 3/ alloys by liquid-film migration

Journal Article · Sat Mar 01 04:00:00 EST 1986 · J. Am. Ceram. Soc.; (United States)

OSTI ID:5850903

Chaim, R; Heuer, A H; Brandon, D G

The tetragonal (t) and cubic (c) ZrO/sub 2/ solid solutions in two-phase ZrO/sub 2/-8 wt% Y/sub 2/O/sub 3/ ceramics have low and high solute content, respectively. Annealing samples sintered at 1600/sup 0/C between 700/sup 0/ and 1400/sup 0/C requires a change in the volume fraction of the coexisting phases, as well as their equilibrium Y/sub 2/O/sub 3/ content. The enrichment in Y/sub 2/O/sub 3/ content of the c-ZrO/sub 2/ grains is accomplished by liquid-film migration involving the ubiquitous silicate grain-boundary phase, while the volume fraction of t-ZrO/sub 2/ increases by the nucleation and growth of cap-shaped t-ZrO/sub 2/ lenses. The interfaces between the c-ZrO/sub 2/ matrix and the growing t-ZrO/sub 2/ lenses are semicoherent.

• Research Organization: Dept. of Metallurgy and Materials Science, Case Western Reserve Univ., Cleveland, OH 44106
• DOE Contract Number: FG02-84ER45110
• OSTI ID: 5850903
• Journal Information: J. Am. Ceram. Soc.; (United States), Journal Name: J. Am. Ceram. Soc.; (United States) Vol. 69:3; ISSN JACTA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201 -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ANNEALING
CERAMICS
CHALCOGENIDES
CRYSTAL STRUCTURE
DISPERSIONS
EQUILIBRIUM
FILMS
FLUID FLOW
GRAIN BOUNDARIES
HEAT TREATMENTS
HIGH TEMPERATURE
LIQUID FLOW
MATERIALS
MICROSTRUCTURE
MIXTURES
NUCLEATION
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
SINTERED MATERIALS
SOLID SOLUTIONS
SOLUTES
SOLUTIONS
TRANSITION ELEMENT COMPOUNDS
VERY HIGH TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES