Interfacial Microstructures in Divorced Graphitic Eutectics (Tem, Study)
Kim, Sooho
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https://hdl.handle.net/2142/71823
Description
Title
Interfacial Microstructures in Divorced Graphitic Eutectics (Tem, Study)
Author(s)
Kim, Sooho
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, Metallurgy
Abstract
Interfacial microstructures in two divorced graphitic eutectics have been investigated using transmission electron microscopy (TEM). Both systems show a coarse minor precipitate, graphite, whose morphology depends strongly on trace elements.
Two recurring bcc/hexagonal orientation relationships discovered in cast irons are related to another two sets of fcc/hexagonal orientation relationships found in nickel-graphite alloys through Kurdjumov-Sachs or Nishiyama-Wasserman relations. These results indicate that the initial products of divorced eutectic solidification in both systems obey rational orientation relationships and that the solid-solid interfaces produced are non-random.
The interfacial boundaries have been characterized by constructing O-lattice models which are able to predict internal dislocation structures as well as Moire patterns. Finally experimentally observed regularly spaced fine features along the boundaries obtained from the single crystal experiments have been compared to the O-cells calculated in a microcomputer.
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