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oai:www.ideals.illinois.edu:2142/71825 2023-07-11 col_2142_5131 col_2142_47053 com_2142_5130 com_2142_47052 com_2142_234

Shiue, Yeong Ruey 2014-12-16T20:52:03Z 2014-12-16T20:52:03Z 10000-01-01 1985 1985 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. Made available in DSpace on 2014-12-16T20:52:03Z (GMT). No. of bitstreams: 1 8600313.pdf: 3723646 bytes, checksum: 02347b1f134b87a84aba36dc0752bb4b (MD5) Previous issue date: 1985 Embargo set by: Seth Robbins for item 71991 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs U of I Only 128 p. Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1985. http://hdl.handle.net/2142/71825 (UMI)AAI8600313 Engineering, Materials Science Grain Boundary Structure in Alumina text Metallurgy and Mining Engineering Metallurgical Engineering University of Illinois at Urbana-Champaign Dissertation Ph.D.