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Characterization of Carbonaceous Exsolvate from Metal Melts

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title
Characterization of Carbonaceous Exsolvate from Metal Melts
author
Bjerke, Jillian Marie
abstract
This study seeks to explore the role of carbon meso-structures in the strengthening of steel by characterizing the carbonaceous exsolvate from a metal-carbon melt. Metal-carbon matrix composites, such as the material used in this investigation, are commonly employed to strengthen tool steel. Structural analysis techniques including scanning electron microscopy, analytical transmission electron microscopy, thermogravimetric analysis and X-ray diffraction are used to study the carbon nanostructures found within the exsolvate. It has been proposed that, due to specific thermodynamic processing conditions, strands of endometallofullerenes exist within the exsolvate which act to strengthen this high carbon steel. Examination of the exsolvate by the aforementioned techniques provided an estimation of the upper limit of the occurrence of these strands in the metal. The results of these studies suggest that the strands are present only in small amounts and that the predominant nanostructure is graphitic carbon. This leads to the conclusion that the increased strength in the steel is likely due to strengthening mechanisms such as grain refinement and that the carbonaceous nanostructures do not play a significant role in steel strength.
subject
electron microscopy
materials science
nanotechnology
physics
TGA
XRD
contributor
Carroll, David L (committee chair)
Jurchescu, Oana D (committee member)
Day, Cynthia S (committee member)
date
2011-09-08T08:35:50Z (accessioned)
2011 (issued)
degree
Physics (discipline)
embargo
10000-01-01 (terms)
10000-01-01 (liftdate)
identifier
http://hdl.handle.net/10339/36147 (uri)
language
en (iso)
publisher
Wake Forest University
type
Thesis

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