Microstructures, crystallography of interfaces, and creep behavior of melt-growth composites

Chain structure in the unidirectionally solidified Al2O3–YAG–ZrO2 eutectic composite

“…The misfit angles in the /11 0 0S direction of Al 2 O 3 , /10 0S; direction of YAG, and /10 0S direction of ZrO 2 with respect to the growth direction was approximately 81, 61, and 151, respectively. The preferred growth directions of the three phases coincided with those observed in the previous study [7].…”

“…Al 2 O 3 -based melt growth composites (MGCs) produced by unidirectional solidification have received much attention as new heat-resistant structural materials [1][2][3][4][5][6][7][8]. It has been reported that Al 2 O 3 /YAG (Y 3 Al 5 O 12 : yttrium-aluminum-garnet) and Al 2 O 3 / GAP (GdAlO 3 : gadolinium-aluminum-perovskite) eutectic composites exhibit excellent flexural strength, corrosion resistance, and thermal stability at high temperatures.…”

Polarized micro‐Raman study of Al2O3‐based directionally solidified oxide eutectics containing GdAlO3 perovskite, Er3Al5O12 garnet and cubic ZrO2

“…The laser was focused on the sample through a microscope and the backscattered Table 1. The directionally solidified eutectic samples of the study [8,33] light was analyzed ('micro-Raman spectroscopy'). The laser spot diameter was limited to about 1 µm with a 100× magnification objective, which was about the size of the domains in the AG and AGZ sample and smaller than the domains in the AE sample (Fig.…”

“…The ∼380, 418, 645, and 751 cm −1 peaks are alumina signatures [12] and the broad massif corresponds to the cubic zirconia phase [13 -16] which was identified through X-ray diffraction. [8] All other wavelengthindependent contributions should be considered as GAP Raman bands. Considering the relative intensities on the bottom three spectra of Fig.…”

Microstructural stability and orientation relationships of directionally solidified Al2O3-Er3Al5O12-ZrO2 eutectic ceramics up to 1600 °C

“…Then, Mazerolles and co-workers studied the microstructure, interfaces and high temperature creep behaviour of Al 2 O 3 -Ln 2 O 3 (Ln=Gd, Er, Y) DSEC. [12,13] They pointed out that the absence of intermediate phases at the interfaces and the crystallographic orientation relationships between phases give rise to a strong cohesion between components. They also confirmed that deformation climb process was controlled by bulk diffusion.…”