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Exaggerated Grain Growth in ZrO 2 ‐Toughened Al 2 O 3
Author(s) -
KIBBEL B.,
HEUER A. H.
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.tb07414.x
Subject(s) - grain growth , intergranular corrosion , grain boundary , materials science , annealing (glass) , amorphous solid , abnormal grain growth , grain size , phase (matter) , composite material , microstructure , metallurgy , mineralogy , crystallography , chemistry , organic chemistry
Annealing of ZrO 2 ‐toughened Al 2 O 3 (ZTA) at elevated temperatures causes growth of both the intergranular ZrO 2 particles and the Al 2 O 3 “matrix” grains. Exaggerated (“breakaway”) grain growth occurs in some, but not all, specimens. Analytical electron microscopy of two ZTA's, both of which contained a continuous amorphous (glassy) grain‐boundary phase, but only one of which showed breakaway grain growth, revealed that the occurrence of breakaway grain growth could be correlated with the chemistry of the ubiquitous glassy grain‐boundary phase.