Abstract
Determination of the morphology and size distribution of particles in a multiple phase material can be accomplished using opaque planar section optical microscopy or thin foil and extraction replica TEM analysis. In all cases, measurements are obtained using two-dimensional information from a planar section or through a projection of three-dimensional space. The two-dimensional size and morphology data obtained must be converted into the true three-dimensional data to be of further use. For spherical particles, methods of two- to three-dimensional size distribution conversion have been developed for planar sections, thin foils and extraction replicas. However, A1N particles precipitated in FCC iron are rod-shaped with a square cross section. To analyze these particles, an iterative method has been developed to determine the true three-dimensional size distribution of rod-shaped particles from their projected images obtained from extraction replicas. This method assumes that the particles are randomly oriented in the matrix phase and that they have a common aspect ratio.
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