Microstructure and mechanical properties of directionally solidified Al2O3/GdAlO3 eutectic ceramic prepared with horizontal high-frequency zone melting

Wang, Shunheng; Chu, Zongfu; Liu, Juncheng

doi:10.1016/j.ceramint.2019.02.082

Cited by 13 publications

(5 citation statements)

References 33 publications

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“…This correlation follows the general trend in eutectic solidification. Plots of the interphase spacing of Al 2 O 3 –GAP eutectic materials fabricated using unidirectional solidification methods at various solidification rates are also included in Figure 5 for comparison 4,5,18,19 . The solidification method in each study was the micro‐pulling‐down (μ‐PD) method, 4 laser floating zone melting, 5 high‐frequency zone melting, 18 and laser‐heated pedestal growth 19 .…”

Section: Resultsmentioning

confidence: 99%

“…The relationship between the eutectic interphase spacing and cooling rate in the flash‐treated and conventionally solidified samples in this study. The previous data of Al 2 O 3 –GAP eutectic microstructures 4,5,18,19 are also plotted for comparison.…”

Section: Resultsmentioning

confidence: 99%

“…Plots of the interphase spacing of Al 2 O 3 -GAP eutectic materials fabricated using unidirectional solidification methods at various solidification rates are also included in Figure 5 for comparison. 4,5,18,19 The solidification method in each study was the micro-pulling-down (μ-PD) method, 4 laser floating zone melting, 5 high-frequency zone melting, 18 and laser-heated pedestal growth. 19 For comparison between the present work and previous studies, the cooling rates C [K/s] in the previous solidification methods were approximately estimated by the production of the reported solidification rate 𝑣 [m/s] and the temperature gradient at the solid-liquid interface G [K/m], namely, C = G𝑣.…”

Section: Resultsmentioning

confidence: 99%

“…Furthermore, some of the eutectic ceramics obtained via the flash sintering process had a fine interphase spacing of approximately ≤1 μm, 10,11 and those fine F I G U R E 5 The relationship between the eutectic interphase spacing and cooling rate in the flash-treated and conventionally solidified samples in this study. The previous data of Al 2 O 3 -GAP eutectic microstructures 4,5,18,19 are also plotted for comparison.…”

Section: Resultsmentioning

confidence: 99%

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Formation of Al₂O₃–GdAlO₃ eutectic ceramics with a fine anisotropic structure in a flash event

2023

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An Al 2 O 3 -GdAlO 3 (GAP) composite with a fine eutectic microstructure was obtained through local melting and rapid solidification during a flash event. An AC field of 1 kV/cm at a frequency of 1 kHz was applied to a calcined Al 2 O 3 -GAP body at a furnace temperature of 1400 • C to induce the flash event. The Al 2 O 3 -GAP body exhibited local melting through the current path. Solidification proceeded with the maximum cooling rate of about 140 • C/s just after the power supply was turned off. Using this flash treatment, a refined eutectic structure with rodlike GAP phases in the Al 2 O 3 matrix was obtained within 1 min. The interphase spacing of the obtained structure was approximately 170 nm, comparable with the finest Al 2 O 3 -GAP eutectic material obtained in previous studies. A flash event and subsequent rapid cooling can contribute to forming fine eutectic ceramics with a relatively low furnace temperature and short processing time.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Formation of Al₂O₃–GdAlO₃ eutectic ceramics with a fine anisotropic structure in a flash event

2023

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“…Enhancement of fracture toughness has also been reported in the re ned eutectic microstructure 19 , and the microstructural toughening mechanism has been studied 20 . Recently, we discovered that the Al 2 O 3 -GAP eutectic composite with submicron-scale interphase spacing can be easily produced using an electric eld-assisted sintering technique, known as ash sintering 21 .…”

Section: Introductionmentioning

confidence: 94%

Overcoming the intrinsic brittleness of high-strength Al2O3-GdAlO3 ceramics through refined eutectic microstructure

Yoshida,

Aoki,

Masuda

et al. 2024

Preprint

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High-strength ceramic materials are known for their exceptional mechanical properties; however, they are often plagued by brittleness, limiting their applications. Because of the inherent difficulty of dislocation glides in ceramics, efforts to enhance reliability of ceramics by activating plastic deformation have faced challenges. This work demonstrates that Al2O3-GdAlO3(GAP) eutectic micropillars with submicron-scale fibrous microstructures exhibit remarkable plastic deformability. They displayed a plastic strain of up to 5% even at 25°C, while the micropillars of Al2O3 or GAP single crystals exhibited brittle fracture similar to conventional high-strength ceramics. The plasticity in Al2O3-GAP eutectic was attributed to the activation of primary prismatic slip and secondary basal slip in the Al2O3 phase, which is typically considered inactive at room temperature. These findings suggest that plastic deformability can be achieved in high-strength ceramic materials by fabricating refined eutectic microstructures.

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Microstructural refinement and mechanical response of Al2O3–ZrO2 eutectics fabricated by a novel pulse discharge plasma assisted melting method

Xie

Wang

Zhang

et al. 2022

Ceramics International

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Microstructure and mechanical properties of directionally solidified Al2O3/GdAlO3 eutectic ceramic prepared with horizontal high-frequency zone melting

Cited by 13 publications

References 33 publications

Formation of Al₂O₃–GdAlO₃ eutectic ceramics with a fine anisotropic structure in a flash event

Formation of Al₂O₃–GdAlO₃ eutectic ceramics with a fine anisotropic structure in a flash event

Overcoming the intrinsic brittleness of high-strength Al2O3-GdAlO3 ceramics through refined eutectic microstructure

Microstructural refinement and mechanical response of Al2O3–ZrO2 eutectics fabricated by a novel pulse discharge plasma assisted melting method

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Microstructure and mechanical properties of directionally solidified Al2O3/GdAlO3 eutectic ceramic prepared with horizontal high-frequency zone melting

Cited by 13 publications

References 33 publications

Formation of Al2O3–GdAlO3 eutectic ceramics with a fine anisotropic structure in a flash event

Formation of Al2O3–GdAlO3 eutectic ceramics with a fine anisotropic structure in a flash event

Overcoming the intrinsic brittleness of high-strength Al2O3-GdAlO3 ceramics through refined eutectic microstructure

Microstructural refinement and mechanical response of Al2O3–ZrO2 eutectics fabricated by a novel pulse discharge plasma assisted melting method

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Resources

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Formation of Al₂O₃–GdAlO₃ eutectic ceramics with a fine anisotropic structure in a flash event

Formation of Al₂O₃–GdAlO₃ eutectic ceramics with a fine anisotropic structure in a flash event