Fracture behavior of directionally solidified CeO2- and Pr2O3-doped Y3Al5O12/Al2O3 eutectic composites

Interpenetrating Network-Structured Al2O3–Y3Al5O12 Eutectic Composite Grown by Containerlessly Directional Solidification Process

“…YAG is influenced by a large interface-kinetic effect during the crystal growth because of its highly complex garnet structure. , The transform of eutectic morphology may occur because that YAG tends to form a nonfaceted phase at the growth rate of 68 μm/s. The complex regular morphology resembles the one formed in the Al 2 O 3 /GdAlO 3 eutectic, in which GdAlO 3 grows in a nonfaceted manner that may infer the nonfaceted growth manner of YAG . When the growth rate increases to 800 μm/s, the DS Al 2 O 3 /YAG eutectic presents the regular lamellar eutectic colonies which are separated by coarse cellular morphology as shown in Figure c.…”

“…The complex regular morphology resembles the one formed in the Al 2 O 3 /GdAlO 3 eutectic, in which GdAlO 3 grows in a nonfaceted manner that may infer the nonfaceted growth manner of YAG. 12 When the growth rate increases to 800 μm/s, the DS Al 2 O 3 /YAG eutectic presents the regular lamellar eutectic colonies which are separated by coarse cellular morphology as shown in Figure 3c.…”

“…4−7 Studies about the growth mechanism of the DS Al 2 O 3 /YAG eutectic are limited because their morphological evolution needs a much higher undercooling degree ΔT associated with the high entropy of the oxide melting phase. 8,9 At present, several directional solidification techniques have been developed to prepare DSE ceramic oxides, such as the Bridgman, 1 laser heated floating zone (LHFZ), 10 micropulling down (μ-PD), 11 or edge-defined film-fed growth (EFG) 12 methods. Arai et al prepared Al 2 O 3 single crystal through an advanced directional solidification thechnique using aerodynamic levitation (ADL).…”

“…At present, several directional solidification techniques have been developed to prepare DSE ceramic oxides, such as the Bridgman, laser heated floating zone (LHFZ), micropulling down (μ-PD), or edge-defined film-fed growth (EFG) methods. Arai et al prepared Al 2 O 3 single crystal through an advanced directional solidification thechnique using aerodynamic levitation (ADL) .…”