Premium
Coarsening of Lamellar Microstructures in Directionally Solidified Yttrium Aluminate/Alumina Eutectic Fiber
Author(s) -
Park DeokYong,
Yang JennMing,
Collins Joseph M.
Publication year - 2001
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2001.tb01126.x
Subject(s) - lamellar structure , materials science , eutectic system , microstructure , yttrium , fiber , alloy , scanning electron microscope , directional solidification , composite material , thermal stability , chemical engineering , metallurgy , oxide , engineering
Coarsening of the fine lamellar structure of a directionally solidified Y 3 Al 5 O 12 (yttrium aluminum garnet, YAG)/Al 2 O 3 eutectic fiber at elevated temperatures was investigated. The fibers were grown continuously by an edge‐defined film‐fed growth (EFG) technique. To study the thermal stability of the lamellar structure, the fibers were heat‐treated in air at 1360°–1460°C for up to 200 h. X‐ray diffractometry and scanning electron microscopy were used to characterize the microstructures of the fibers. Image analysis was used to measure the length of the interface line between Y 3 Al 5 O 12 and Al 2 O 3 phases. The kinetics of coarsening and the rate‐controlling mechanisms were investigated. Also, the Graham and Kraft model for describing the coarsening behavior of the lamellar Al‐CuAl 2 eutectic alloy was used to explain the coarsening behavior of Y 3 Al 5 O 12 /Al 2 O 3 eutectic fiber.