Abstract
Ultrasonic pulse‐echo technique was used for the characterization of sintered zirconia‐toughened alumina (ZTA) ceramics. The variation of the ultrasonic velocity and elastic constants with the volume fraction of zirconia in the alumina matrix was studied. The ultrasonic velocity variation in these materials also was modeled using a mean‐value approach. The zirconia grains in ZTA were modeled by oblate spheroids, whose aspect ratio was estimated from the two‐dimensional microstructure of the material using stereological relations. The aspect ratio was then used as a parameter to estimate the ultrasonic velocity variation in the material using self‐consistent spheroidal inclusion theory, and the model was validated by comparing the estimated data with the measured velocity values, which showed very good agreement.
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