Abstract
The microstructural evolution of dense Al2O3–Y3Al5O12 (YAG) composites exposed to an electric field treatment has been investigated. In particular, the transformation of the initially homogenous composite structure into three different regions has been observed, including (1) the composite structure region, (2) the eutectic region, and (3) the segregation region. In addition, pores and holes have been introduced into a dense structure of the sample after the electric field treatment. The observed phenomena have been interpreted in terms of the electromigration mechanism induced by the high electric field, rather than the melting caused by the Joule heating of the composites. The results indicate the potential of electric field treatment as a new post-processing method to optimize microstructure and properties during ceramic manufacturing.
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