Abstract
The microstructure of sintered metals and ceramics may be modeled as two phases consisting of the particles and a surrounding matrix during certain processing stages. Diffuse ultrasonic backscatter has been widely used to extract the microstructural parameters and also to detect flaws in such materials. In this research, a singly-scattered response model is used to predict the grain noise for the two-phase model. The expression of backscatter coefficient is derived and found to be dependent on the spatial correlations of the material properties. The geometric two-point correlation function plays an important role in this model and can be determined from numerical correlation statistics. Good agreement is found between the results determined from the model and the experimental results.
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