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Interface nucleation rate limited densification during sintering
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DOI：10.1016/j.actamat.2022.118448.png)
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Abstract
En 中文
In situ bicrystal sintering experiments performed in a transmission electron microscope indicate that the densification rate can follow interface nucleation rate limited kinetics. This work performs in situ sintering experiments on immiscible Al2O3-GdAlO3 interfaces enabling a statistical treatment of sintering at a single interface type as a function of time and temperature. The data provide a measure for the activation energy of the nucleation process, asymptotic to 4.8 eV. This large value is consistent with observations that the process is rate limiting. A new sintering model is developed based on the assumption of interface nucleation rate limited kinetics and is demonstrated to work well in predicting in situ bicrystal sintering data, fitting in situ multiparticle sintering data, predicting grain size versus density sintering trajectories, and fitting isothermal bulk sintering data. (C) 2022 The Authors. Published by Elsevier Ltd on behalf of Acta Materialia Inc.
Keywords:
TRANSMISSION ELECTRON-MICROSCOPY
BICRYSTAL COBLE CREEP
GRAIN-BOUNDARY
NANOCRYSTALLINE CERAMICS
EUTECTIC COMPOSITE
SURFACE-DIFFUSION
ALUMINA
GROWTH
ZIRCONIA
TEMPERATURE
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