Abstract
The three-dimensional microstructural development of silicon nitride ceramics that exhibit superplastic elongation (up to ɛ = 1.34) was analyzed using a stereological analysis method. According to the microstructural change from randomly oriented grains to aligned grains along the tensile direction, the average orientation angle between the tensile axis and the major axis of a grain decreased monotonously as the strain increased. The average grain aspect ratio remained almost constant up to ɛ = 0.88 and then started to increase. Based on the microstructural development, three different modes of the change in the grain configuration-i.e., grain rotation, grain elongation, and grain translation-were considered. It is suggested that the contributions of the three modes vary according to the microstructural development during the deformation.
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