Grain-boundary faceting at a Σ = 3, [110]/{112} grain boundary in a cubic zirconia bicrystal

Naoya Shibata, Fumiyasu Oba, Takahisa Yamamoto, Taketo Sakuma, Yuichi Ikuhara

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)

Abstract

The atomic structure of a Σ = 3, [110]/{112} grain boundary in a yttria-stabilized cubic zirconia bicrystal has been investigated by high-resolution transmission electron microscopy (HRTEM). It was found that the grain boundary migrated to form periodic facets, although the bicrystal was initially joined so as to have the symmetric boundary plane of {112}. The faceted boundary planes were indexed as {111}/{115}. The structure of the {111}/{115} grain boundary was composed of an alternate array of two types of structure unit: {112}- and {111}-type structure units. HRTEM observations combined with lattice statics calculations verified that both crystals were relatively shifted by (a/4)[110] along the rotation axis to form a stable grain-boundary structure. A weak-beam dark-field image revealed that there was a periodic array of dislocations along the grain boundary. The grain-boundary dislocations were considered to be introduced by the slight misorientation from the perfect Σ = 3 orientation. The fact that the periodicity of the facets corresponded to that of the grain-boundary dislocations must indicate that the introduction of the grain-boundary dislocations is closely related to the periodicity of the facets. An atomic flipping model has been proposed for the facet growth from the initial Σ = 3, {112} grain boundary.

Original languageEnglish
Pages (from-to)2221-2246
Number of pages26
JournalPhilosophical Magazine
Volume83
Issue number19
DOIs
Publication statusPublished - 2003 Jul 1
Externally publishedYes

ASJC Scopus subject areas

  • Condensed Matter Physics

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