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https://hdl.handle.net/2142/71825
Description
Title
Grain Boundary Structure in Alumina
Author(s)
Shiue, Yeong Ruey
Issue Date
1985
Department of Study
Metallurgy and Mining Engineering
Discipline
Metallurgical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Materials Science
Abstract
Grain boundary microstructures in alumina ceramics are prone to show glassy phases, faceting, and some fraction of highly coincident twin-related boundaries. These separate phenomena and their inter- actions have been studied in six distinct materials of both commer- cial and experimental origin. Glass containing materials show high density of (SIGMA) = 3 basal twins and few others. Some hot pressed materials show, in addition to basal twins, (SIGMA) = 7 rhombohedral twins and two distinct varieties of 10(')11 twins new to alumina. All these boundaries are analyzed using the CSL/DSCL model and an idealized axial ratio c/a = SQRT.(15/2); 0 lattice methods are employed to estimate the error introduced by that idealization. The basal and rhombohedral twins seem well-described by the model, while the 10(')11 ones show unexpected displacements from coincident geometries.
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