Microstructure evolution and crystallography of directionally solidified Al2O3/Y3Al5O12 eutectic ceramics prepared by the modified Bridgman method

doi:10.1016/j.jmst.2019.05.018Get rights and content

Abstract

Abstract:

Large size, high-density (99.97%) and well-organized Al₂O₃/Y₃Al₅O₁₂ (YAG) eutectic ceramics were prepared by the modified Bridgman method. The evolution of the three dimensional microstructure and micropores were investigated. The diameter of the micro-pores and the porosity decreased during directional solidification. The average equivalent diameter of the micro-pores was 2.41 μm in the well-prepared eutectic ceramics. Most of the pores (98.07%) were smaller than 4 μm. These data are comparable to those prepared by the optical floating zone method. The as-grown eutectic ceramics were polycrystalline, but the interfaces were well-bonded and there were no amorphous phases in the microstructure. The misfits of the different crystallographic relationships were calculated, and the bottleneck of the single-crystal preparation was identified. These results could provide theoretical guidance for the preparation of large, single-crystal Al₂O₃/YAG eutectic ceramics by the modified Bridgman method.

Key words: Al₂O₃/YAG eutectic ceramics, Crystallography, Interfaces, Bridgman method

Xu Wang, Nan Zhang, Yujie Zhong, Bailing Jiang, Langhong Lou, Jian Zhang, Jingyang Wang. Microstructure evolution and crystallography of directionally solidified Al₂O₃/Y₃Al₅O₁₂ eutectic ceramics prepared by the modified Bridgman method[J]. J. Mater. Sci. Technol., 2019, 35(9): 1982-1988.

Figures/Tables 11

Fig. 1. Mo mold and the as-cast Al2O3/YAG eutectic sample (a) and (b); (c) Al2O3/YAG eutectic sample after annealing at 1550 °C for 48 h.

Fig. 2. Longitudinal microstructures at the top (a) and bottom (b) of the grain selection bar (marked by the white rectangles).

Fig. 3. Longitudinal SEM images of four representative sections of the as-cast Al2O3/YAG eutectic ceramics.

Fig. 4. (a) Constructed three-dimensional microstructure in the area marked by the white rectangle in Fig. 2(b); (b), (c) and (d) 2D microstructure in the XY, XZ and YZ planes marked by the yellow planes in (a), respectively.

Fig. 5. (a) Three-dimensional microstructure in the area marked by the white rectangle in Fig. 2(a); (b), (c) and (d) corresponding 2D microstructures in the XY, XZ and YZ planes.

Fig. 6. Micro-pores and their spatial distribution in the area marked by the white rectangle in Fig. 2(b): (a) and (b) in Fig. 2(a).

Table 1 Parameters of the micropores of the two representative parts, together with the previously reported values for comparison.

Methods	Maximum diameter (μm)	Average equivalent diameter (μm)	Frequency (d < 4 μm)	Porosity
Bridgman (Fig. 4)	34	3.71	88.7%	0.44%
Bridgman (Fig. 5)	12.8	2.41	98.07%	0.033%
OFZ [22]	11.5	2.6	84%	0.013%

Fig. 7. (a) Transverse optical microscopy photograph in the area marked by the white rectangle in Fig. 2(a); (b-f) EBSD maps corresponding to the selected areas numbered.I-V.

Fig. 8. Transverse sectional TEM micrograph of the Al2O3/YAG interface indicated by the red arrow in Fig. 7b (a); (b) HREM image of the interface recorded with the incident beam parallel to the [001] direction of the YAG and the [0001] direction of Al2O3; (c) the electron diffraction patterns at the Al2O3/YAG interface obtained by FFT of (b).

Fig. 9. Schematic illustration of interfaces and interface matching of case I: <0001 > { $\bar{1120}$}Al2O3 || <001 > {420}YAG (a); case II: < $\bar{1010}$ >{0001}Al2O3 || < 112 > {011}YAG (b), case III: < $\bar{1120}$>{0001}Al2O3 || <110 > {211}YAG (c); and case IV: < $\bar{1010}$ > {0001} Al2O3 || < 110 > {211} YAG (d); Corresponding lattice structures of the four cases are given beside the matching images.

Table 2 Crystallographic relationships and the corresponding misfits between Al2O3 and the YAG.

Case	Misfit (%)
I: <0001 > { $\bar{1120}$}Al₂O₃ \|\| <001 > {420}YAG	10.4
II: < $\bar{1010}$ >{0001}Al₂O₃ \|\| <112 > {011}YAG	9.8
III: < $\bar{1120}$ >{0001}Al₂O₃ \|\| <110 > {211}YAG	11.9
IV: < $\bar{1010}$ > {0001}Al₂O₃ \|\| < 110 > {211}YAG [20]	8.4

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Microstructure evolution and crystallography of directionally solidified Al₂O₃/Y₃Al₅O₁₂ eutectic ceramics prepared by the modified Bridgman method

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