Abstract
Porous media in which deep pores are regularly aligned were fabricated by unidirectional solidification of monotectic alloys and selective dissolution of the rod phase. Unidirectional solidification of Al-In alloys with hyper-monotectic compositions under a high static magnetic field up to 10 T achieved the rod-type eutectic-like structure in which continuous rods were regularly aligned. The static magnetic field exceeding several T reduced movement of the In droplets and enhanced the engulfment of the In droplets into the solidifying front. The coupled growth between the liquid In and the Al occurred and consequently the regular structure was produced even at the hyper-monotectic composition. A selective dissolution of the In rods from the Al matrix was performed to fabricate porous media. A micro X-ray tomography technique using a synchrotron radiation was used to evaluate the solidified structure and the selective dissolution of the In rod during the electrochemical etching.
