New microstructures in ceramic materials from the melt for high temperature applications

Effect of interfacial energy on microstructure of a directionally solidified Al2O3/YAG eutectic ceramic

“…16,17 Obviously, a competition between interfacial energy and the seed constraint is expected. It is worth mentioning that the COR-II is consistent with the confirmed preferred crystallography relationship of the directionally solidified Al 2 O 3 /YAG eutectic ceramic in Reference.…”

Crack propagation and stress distribution in binary and ternary directionally solidified eutectic ceramics

“…Concerning the crystallographic orientation of the alumina phase, electron backscattered diffraction (EBSD) and TEM investigations [4][5][6][7] have shown that the growth direction (i.e. the normal (z) to the specimen surface in the present measurements) is 1 01 0 in all the binary and ternary DSEs under consideration.…”

“…Studies to control the microstructure of directionally solidified eutectic ceramics have been performed, acting on the processing parameters of the floating-zone method (arc image furnace). [4][5][6][7][8] The mechanical properties have thus been investigated on the small specimens manufactured through this process. A biaxial testing disc flexure device 9 has been used to investigate the early stage of crack propagation in the interconnected microstructure of the DSE ceramics.…”

Microstructure evolution of Al 2 O 3 /Y 3 Al 5 O 12 eutectic crystal during directional solidification

“…2b, d, f and h indicated that the preferred growth direction of Al 2 O 3 is ½1 0 1 0. (The two colors correspond to the same ½1 0 1 0 direction since EBSD are unable to distinguish ½1 0 1 0 and ½0 1 1 0 [28]). Grain boundary (GB) and sub-GB of YAG was observed in Fig.…”