Evaluation of microstructure of a 6092 Al - 17.5 volume percent SiC particle reinforced composite using Electron Backscatter Pattern (EBSP) analysis methods
By: John J. Markovich
Publisher: Naval Postgraduate School; Available from National Technical Information Service
Published: 1998
Place of publication: Monterey, Calif; Springfield, Va
Language: eng
Number of pages: 68
Description: Microtexture and grain boundary misorientation data were obtained for a 6092 Al-17.5 volume percent SiC      particle reinforced material as a function of processing history. Computer aided electron backscatter pattern      (EBSP) analysis methods in a scanning electron microscope were used to obtain grain-specific orientation      measurements by traversing along a pattern of lines on the surface of a metallographic sample. As part of this      project, it was necessary to develop ion milling methods to obtain a sufficiently strain free condition of the      aluminum matrix to allow diffraction patterns to be obtained. These methods were applied to samples extruded      at various strain rates and processing temperatures; the data revealed that recrystallization had occurred at all      processing conditions. Analysis of crystal orientations and grain-to-grain misorientation data revealed random      distributions consistent with predictions of the particle- stimulated nucleation theory of recrystallization.      Additionally, spacing measurements were taken between orientation measurements, The result of this analysis      indicated a very fine matrix micro structure.
Notes: Thesis advisor(s): Terry R. McNelley.

"March 1998."

Thesis (M.S. in Mechanical Engineering) Naval Postgraduate School, March 1998.

Includes bibliographical references (p. 63-65)

Approved for public release; distribution unlimited.

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US Army (USA) author.

dk/dk cc:9116 8/5/98.