Abstract
Homogeneity, defined in terms of spatial distribution uniformity of one phase or component within another, can be determined from the variation of the standard deviation of the measured volume fraction of one component with sampling area. We have applied this concept to the evaluation of dispersions of Sic whiskers in an alumina matrix by using energy dispersive x-ray spectroscopy (EDS) . The quantitative analysis measures the area to area variation in SiC fraction. The homogeneity distribution was obtained by calculating the variance in this fraction as a function of magnification (sampling area) in a scanning electron microscope. These data are compared to calculations of expected values based on a Poisson distribution model for the dispersion of SiC.Compositions were prepared from two different SiC size distributions. The blending procedures and volume fractions (0.30) were the same for each composition. Six polished specimens were analyzed from each of two 100mm diameter hot-pressed alumina - SiC billets.
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Schedule a callMore From: Proceedings, annual meeting, Electron Microscopy Society of America
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