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On the dynamic compared to static grain growth rate in 3 mole% yttria-stabilized tetragonal zirconia polycrystals (3 Y-TZP)

1 Materials Science and Engineering Dept., Rutgers, the State University of New Jersey, Piscataway, NJ 08855-0909, USA
2 Material Science and Engineering Dept., North Carolina State University Raleigh, NC 27695-7907, USA

The reason for the higher dynamic grain growth rate compared to static rate is considered with focus on the results by Nied and Wadsworth on 3 mole% yttria-stabilized zirconia (3 Y-TZP). Included is a review of the models and theories of the pertinent grain growth kinetics and on the concurrent grain boundary cavitation. It is concluded that the same physical mechanism governs both dynamic and static grain growth, and that the existing grain size is an important factor in both cases. It is further concluded that the major factor responsible for the higher dynamic grain growth rate is the pre-exponential in the Arrhenius-type grain growth kinetics equation, the entropy corresponding to the atomic diffusion being an important parameter. There exists insufficient information to ascertain the influence of grain boundary cavitation on the concurrent dynamic grain growth.
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