Investigation on the Microstructural Evolution Mechanism of GdAlO3-Al2O3 Eutectics Grown by Micro-Pulling-Down Method

doi:10.16553/j.cnki.issn1000-985x.2025.0141

Abstract

Abstract: GdAlO₃（GAP）-Al₂O₃ oxide eutectic is widely used in high-temperature structural materials due to its high bending strength， excellent creep resistance and oxidation resistance at high temperature. As well known， the properties of eutectic materials are influenced directly by the microstructure of eutectic， and the microstructure of eutectic materials can be arranged in a certain direction through directional solidification technology. Micro-pulling-down method （μ-PD）， as a directional solidification technology for crystal growth， has the advantages with large temperature gradient， wide growth rate range， short growth period， and visible growth process. In this work， GdAlO₃（GAP）-Al₂O₃ eutectics were grown by μ-PD， and its microstructure was determined by XRD and SEM. The results show that the microstructure of the obtained eutectics was changed gradually from disorder to order with the increasing of growth rate. The microstructure of eutectic is also influenced by the temperature gradient and growth rate.The evolution mechanism of eutectic microstructure was investigated. By optimizing the growth conditions， large-scale eutectic materials with ordered microstructure are expected to be obtained， which have potential applications in the fields of high-resolution detection imaging， laser display and lighting， optical storage and optical temperature sensor.

Key words: GdAlO₃-Al₂O₃ eutectic; directional solidification; micro-pulling down method; microstructural evolution

CLC Number:

O734

LIU Zhen, XU Jintao, ZHU Shanlin, LIAO Canyuan, HU Hongwei, ZHONG Xingyuan, ZHONG Jiuping. Investigation on the Microstructural Evolution Mechanism of GdAlO₃-Al₂O₃ Eutectics Grown by Micro-Pulling-Down Method[J]. Journal of Synthetic Crystals, 2025, 54(12): 2136-2145.

Figures/Tables 10

Fig.1 Meniscus and eutectic grown by micro-pulling-down method

Fig.2 GAP-Al2O3 eutectic prepared by micro-pulling-down method

Fig.3 XRD patterns of powder GAP-Al2O3 eutectic samples （a）， and XRD patterns of cross-section and longitudinal-section （b） of bulk GAP-Al2O3 eutectic samples

Fig.4 SEM image of GAP-Al2O3 eutectic （a）， and EDS mapping （b）~（d） of GAP-Al2O3 eutectic

Fig.5 20.5% power， cross-section SEM images of GAP-Al2O3 eutectic samples prepared at different growth rates

Fig.6 Relationship between eutectic layer spacing λ and growth rate ν

Fig.7 Cross-section SEM images of eutectic samples prepared with different heating powers at a growth rate of 3.0 mm/min

Fig.8 （a1） Schematic diagram of placing “high coil”；（b1） schematic diagram of “low coil” placement；（a2）~（a4） SEM images of eutectic cross-sections grown at 3.0， 4.0， and 5.0 mm/min with 19.5% power and “high coil” placement；（b2）~（b4） SEM images of eutectic cross-sections grown at 3.0， 4.0， and 5.0 mm/min with 19.5% power and “low coil” placement. The inset is an enlarged view of the rod like ordered structure

Table 1 Diameter of rod-like GAP phase under different growth conditions

Growth rate /（mm·min^-1）	Fiber diameter （under the lower G）/nm	Fiber diameter （under the larger G）/nm
3.0	620	560
4.0	450	400
5.0	360	320

Fig.9 Cross-section of eutectic samples prepared at different growth rates of 19.0% heating power （a）， and growth rate of 3.0 mm/min， cross-section of eutectic samples prepared at different heating powers（b）

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Investigation on the Microstructural Evolution Mechanism of GdAlO₃-Al₂O₃ Eutectics Grown by Micro-Pulling-Down Method

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