Evaluation of Microstructure of a 6092 Al-17.5 Volume Percent SiC Particle Reinforced Composite Using Electron Backscatter Pattern (EBSP) Analysis Methods
NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF MECHANICAL ENGINEERING
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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.
- Laminates and Composite Materials