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Phase Equilibration in ZrO 2 ‐Y 2 O 3 Alloys by Liquid‐Film Migration
Author(s) -
CHAIM R.,
HEUER A. H.,
BRANDON D. G.
Publication year - 1986
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1986.tb07417.x
Subject(s) - materials science , nucleation , annealing (glass) , volume fraction , tetragonal crystal system , phase (matter) , phase boundary , analytical chemistry (journal) , crystallography , grain boundary , ceramic , mineralogy , microstructure , metallurgy , thermodynamics , crystal structure , chemistry , composite material , organic chemistry , chromatography , physics
The tetragonal ( t ) and cubic ( c ) ZrO 2 solid solutions in two‐phase ZrO 2 ‐8 wt% Y 2 O 3 ceramics have low and high solute content, respectively. Annealing samples sintered at 1600°C between 700° and 1400°C requires a change in the volume fraction of the coexisting phases, as well as their equilibrium Y 2 O 3 content. The enrichment in Y 2 O 3 content of the c ‐ZrO 2 grains is accomplished by liquid‐film migration involving the ubiquitous silicate grain‐boundary phase, while the volume fraction of t ‐ZrO 2 increases by the nucleation and growth of cap‐shaped t ‐ZrO 2 lenses. The interfaces between the c ‐ZrO 2 matrix and the growing t ‐ZrO 2 lenses are semicoherent.