Author/Authors :
Yasuda، نويسنده , , Hideyuki and Ohnaka، نويسنده , , Itsuo and Mizutani، نويسنده , , Yoshiki and Morikawa، نويسنده , , Takashi and Takeshima، نويسنده , , Satoshi and Sugiyama، نويسنده , , Akira and Waku، نويسنده , , Yoshiharu and Tsuchiyama، نويسنده , , Akira and Nakano، نويسنده , , Tsukasa and Uesugi، نويسنده , , Kentaro، نويسنده ,
Abstract :
The coupled growth zone of the Al2O3–YAG eutectic system was examined by means of high resolution X-ray tomography. The entangled eutectic structure was observed for the unidirectional solidification and the solidification from the undercooled melt at the equilibrium eutectic composition (Al2O3–18.5 mol% Y2O3). The reconstructed three-dimensional images showed that both the Al2O3 and the YAG phases branched and that the entangled domain was of the same order as the lamellar spacing. Comparison of the branching in the Al2O3–YAG eutectic system to that in metallic alloys that exhibit the regular or the irregular eutectic structure indicated that the frequent branching of both phases resulted in the entangled structure.
