An Al₂O₃–GdAlO₃ (GAP) composite with a fine eutectic microstructure was obtained through local melting and rapid solidification during a flash event. An AC field of 1 kV?cm⁻¹ at a frequency of 1 kHz was applied to a calcined Al₂O₃–GAP body at a furnace temperature of 1400°C to induce a flash event, in which electrical conductivity and self-diffusion mass transport in oxide material are drastically increased at electric field and ambient temperature above critical values. The Al₂O₃–GAP body exhibited local melting through the current path, and a refined eutectic structure with rod-like GAP phases in the Al₂O₃ matrix was obtained within 1 min. The interphase spacing of the obtained structure was approximately 170 nm, comparable with the finest Al₂O₃–GAP eutectic material obtained by unidirectional solidification methods in previous studies. A flash event and subsequent rapid cooling can contribute to forming fine eutectic ceramics with a relatively low furnace temperature and short processing time. In the presentation, microscopic deformation behavior of the obtained Al₂O₃–GAP eutectic material examined by micropillar compression testing will be presented.