Premium
Faceted Grain Boundaries in Al 2 O 3
Author(s) -
MORRISSEY K. J.,
CARTER C. B.
Publication year - 1984
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.1151-2916.1984.tb18851.x
Subject(s) - faceting , grain boundary , materials science , void (composites) , condensed matter physics , facet (psychology) , plane (geometry) , grain boundary strengthening , basal plane , crystallography , geometry , microstructure , metallurgy , composite material , chemistry , physics , psychology , social psychology , mathematics , personality , big five personality traits
Different types of faceted grain boundaries in commercial poly‐crystalline Al 2 O 3 were examined. Three distinct cases, namely the basal twin, the rhombohedral twin, and other special high‐angle grain boundaries, are discussed, comparing theoretical models and experimental observations. It is shown that the faceting of the boundaries can be associated with their migration. A mechanism for the separation of a σ= 13 grain houndary from a pinning void, small grain, or second‐phase particle is illustrated. It is also shown experimentally that faceting of high‐angle boundaries can occur on a scale of Σ 5 nm, and that, theoretically, faceting most likely also occurs on an atomistic scale. Throughout the theoretical analysis the basal plane is predicted to be a favored facet plane, which is confirmed by experimental observation.