The Experts below are selected from a list of 15228 Experts worldwide ranked by ideXlab platform
Hengzhi Fu - One of the best experts on this subject based on the ideXlab platform.
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microstructure and cytotoxicity of al2o3 zro2 eutectic bioceramics with high mechanical properties prepared by laser floating zone melting
Ceramics International, 2018Co-Authors: Haijun Su, Enyuan Wang, Jun Zhang, Hui Yang, Hengzhi FuAbstract:Abstract Developing new generation of strong, tough and stable bioceramics used in dental filed has been highly desired for attaining the clinical requirement of secure and reliable therapy. In this paper, a novel Al2O3-ZrO2 eutectic bioceramics with nearly fully density and extremely aesthetic luster was in-situ prepared by innovative laser floating zone melting (LFZM) method. The influence of Solidification Rates on microstructure evolution, mechanical properties and cytotoxicity was investigated. The eutectic bioceramics displayed a special three dimensional interpenetrating microstructure evolving with increasing the Solidification Rate. The eutectic colony structure occurred when Solidification Rate overpassed 8 µm/s, and lamellar spacing was below 1 µm when Solidification Rate exceeded 30 µm/s. The eutectic bioceramics solidified at 100 µm/s exhibited optimal mechanical properties with an average hardness of 16.53 GPa, fracture toughness of 6.5 MPa m1/2 and flexural strength of 1.37 GPa. The cytotoxicity of Al2O3-ZrO2 eutectic bioceramics was evaluated by MTT methods according to ISO 10993-5 standard. Non-cytotoxic behavior was detected for the eutectic bioceramics, indicating this eutectic bioceramic could be used as promising dental restoration material.
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microstructure tailoring and thermal stability of directionally solidified al 2 o 3 gdalo 3 binary eutectic ceramics by laser floating zone melting
Ceramics International, 2018Co-Authors: Haijun Su, Enyuan Wang, Jun Zhang, Di Zhao, Hengzhi FuAbstract:Abstract Directionally solidified Al2O3/GdAlO3 eutectic composite ceramics with low Solidification defects are prepared by laser floating zone melting to tailor homogeneous microstructure and thermal stability performance under high temperature gradient. At low Solidification Rate, the Solidification microstructure shows periodical growth striations in which coarse colony microstructure and homogeneous ‘Chinese script’ irregular eutectic structure are coexisted. The growth striation interval L and Solidification Rate V follow the relationship of L/V = (238.8 ± 2.4) s. By further optimizing laser processing parameters, the eutectic spacing is greatly refined to submicron scale and microstructure oscillation is eliminated at high Solidification Rates, and fully regular lamellar/rod eutectic structures are obtained by faceted eutectic transition. The rod-like eutectic spacing (λ) and Solidification Rate (V) follow the linear relationship of λ·V1/2 = 6.21 µm3/2 s−1/2. Furthermore, the as-solidified eutectic composite even with fine eutectic structure exhibits excellent thermal stability after heat exposure at 1500 °C for 250 h.
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microstructures and mechanical properties of directionally solidified al2o3 gdalo3 eutectic ceramic by laser floating zone melting with high temperature gradient
Journal of The European Ceramic Society, 2017Co-Authors: Haijun Su, Jun Zhang, Hengzhi FuAbstract:Abstract Directionally solidified Al2O3/GdAlO3 eutectic ceramic rods with high densities and low Solidification defects are prepared by laser floating zone melting at Solidification Rate from 2 to 200 μm/s. The microstructure evolution, eutectic growth behavior and mechanical properties are investigated. At low Solidification Rates (
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solid liquid interface and growth Rate range of al2o3 based eutectic in situ composites grown by laser floating zone melting
Journal of Alloys and Compounds, 2016Co-Authors: Haijun Su, Hengzhi Fu, Jun Zhang, Taiwen Huang, Wenchao YangAbstract:Abstract Directionally solidified Al 2 O 3 /Er 3 Al 5 O 12 (EAG) eutectic in situ composites are prepared by laser floating zone melting (LFZM) to investigate the solid–liquid interface characteristic and growth Rate range under non-equilibrium Solidification conditions. The solid–liquid ( S–L ) interface is in situ obtained by rapidly quenching, and its microstructure morphology and primary phase based on different eutectic compositions are analyzed. In stable growth zone, the composite presents typically “Chinese script” (CS) irregular eutectic structure consisting of interpenetRated Al 2 O 3 and EAG phases, but in quenched region the regular eutectic lamellae and CS structure are coexisted. Primary Al 2 O 3 phase in hypoeutectic composition is found both in S–L interface front and quenched region. Different from the stable growth zone, in quenched region as the Solidification Rate increases, the eutectic lamellae spacing does not show obvious decrease. The minimum eutectic lamellae spacing is refined to about 200 nm when the Solidification Rate is increased up to 100 μm/s. On the basis, according to the Jackson-Hunt (J-H) model, the maximum Solidification Rate in quenched region is calculated to be smaller than 1.26 × 10 3 μm/s, and the undercooling degree is 4.15 K.
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directional Solidification of ni ni3si eutectic in situ composites by electron beam floating zone melting
Physica B-condensed Matter, 2013Co-Authors: Jun Zhang, Kun Wu, Hengzhi FuAbstract:Abstract Combining the intermetallic compound with the ductile metal at the eutectic composition is one promising method to improve the ductility of the intermetallic compound. This paper reports the microstructure and the micro-hardness of the Ni–Ni3Si eutectic in situ composites prepared by electron beam floating zone melting technique. Ni–Ni3Si eutectic in situ composites display regular lamellar eutectic structure at the Solidification Rate R=0.3–4.0 mm/min. The lamellar spacing is decreased with the increase of the Solidification Rate. The phase composition of the Ni–Ni3Si eutectic in situ composites is also determined by X-ray diffraction. Ni–Ni3Si eutectic in situ composites present lower micro-hardness than pure Ni3Si, although a small quantity of metastable Ni31Si12 phase is formed during the directional Solidification process.
Jun Zhang - One of the best experts on this subject based on the ideXlab platform.
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microstructure and cytotoxicity of al2o3 zro2 eutectic bioceramics with high mechanical properties prepared by laser floating zone melting
Ceramics International, 2018Co-Authors: Haijun Su, Enyuan Wang, Jun Zhang, Hui Yang, Hengzhi FuAbstract:Abstract Developing new generation of strong, tough and stable bioceramics used in dental filed has been highly desired for attaining the clinical requirement of secure and reliable therapy. In this paper, a novel Al2O3-ZrO2 eutectic bioceramics with nearly fully density and extremely aesthetic luster was in-situ prepared by innovative laser floating zone melting (LFZM) method. The influence of Solidification Rates on microstructure evolution, mechanical properties and cytotoxicity was investigated. The eutectic bioceramics displayed a special three dimensional interpenetrating microstructure evolving with increasing the Solidification Rate. The eutectic colony structure occurred when Solidification Rate overpassed 8 µm/s, and lamellar spacing was below 1 µm when Solidification Rate exceeded 30 µm/s. The eutectic bioceramics solidified at 100 µm/s exhibited optimal mechanical properties with an average hardness of 16.53 GPa, fracture toughness of 6.5 MPa m1/2 and flexural strength of 1.37 GPa. The cytotoxicity of Al2O3-ZrO2 eutectic bioceramics was evaluated by MTT methods according to ISO 10993-5 standard. Non-cytotoxic behavior was detected for the eutectic bioceramics, indicating this eutectic bioceramic could be used as promising dental restoration material.
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microstructure tailoring and thermal stability of directionally solidified al 2 o 3 gdalo 3 binary eutectic ceramics by laser floating zone melting
Ceramics International, 2018Co-Authors: Haijun Su, Enyuan Wang, Jun Zhang, Di Zhao, Hengzhi FuAbstract:Abstract Directionally solidified Al2O3/GdAlO3 eutectic composite ceramics with low Solidification defects are prepared by laser floating zone melting to tailor homogeneous microstructure and thermal stability performance under high temperature gradient. At low Solidification Rate, the Solidification microstructure shows periodical growth striations in which coarse colony microstructure and homogeneous ‘Chinese script’ irregular eutectic structure are coexisted. The growth striation interval L and Solidification Rate V follow the relationship of L/V = (238.8 ± 2.4) s. By further optimizing laser processing parameters, the eutectic spacing is greatly refined to submicron scale and microstructure oscillation is eliminated at high Solidification Rates, and fully regular lamellar/rod eutectic structures are obtained by faceted eutectic transition. The rod-like eutectic spacing (λ) and Solidification Rate (V) follow the linear relationship of λ·V1/2 = 6.21 µm3/2 s−1/2. Furthermore, the as-solidified eutectic composite even with fine eutectic structure exhibits excellent thermal stability after heat exposure at 1500 °C for 250 h.
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microstructures and mechanical properties of directionally solidified al2o3 gdalo3 eutectic ceramic by laser floating zone melting with high temperature gradient
Journal of The European Ceramic Society, 2017Co-Authors: Haijun Su, Jun Zhang, Hengzhi FuAbstract:Abstract Directionally solidified Al2O3/GdAlO3 eutectic ceramic rods with high densities and low Solidification defects are prepared by laser floating zone melting at Solidification Rate from 2 to 200 μm/s. The microstructure evolution, eutectic growth behavior and mechanical properties are investigated. At low Solidification Rates (
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solid liquid interface and growth Rate range of al2o3 based eutectic in situ composites grown by laser floating zone melting
Journal of Alloys and Compounds, 2016Co-Authors: Haijun Su, Hengzhi Fu, Jun Zhang, Taiwen Huang, Wenchao YangAbstract:Abstract Directionally solidified Al 2 O 3 /Er 3 Al 5 O 12 (EAG) eutectic in situ composites are prepared by laser floating zone melting (LFZM) to investigate the solid–liquid interface characteristic and growth Rate range under non-equilibrium Solidification conditions. The solid–liquid ( S–L ) interface is in situ obtained by rapidly quenching, and its microstructure morphology and primary phase based on different eutectic compositions are analyzed. In stable growth zone, the composite presents typically “Chinese script” (CS) irregular eutectic structure consisting of interpenetRated Al 2 O 3 and EAG phases, but in quenched region the regular eutectic lamellae and CS structure are coexisted. Primary Al 2 O 3 phase in hypoeutectic composition is found both in S–L interface front and quenched region. Different from the stable growth zone, in quenched region as the Solidification Rate increases, the eutectic lamellae spacing does not show obvious decrease. The minimum eutectic lamellae spacing is refined to about 200 nm when the Solidification Rate is increased up to 100 μm/s. On the basis, according to the Jackson-Hunt (J-H) model, the maximum Solidification Rate in quenched region is calculated to be smaller than 1.26 × 10 3 μm/s, and the undercooling degree is 4.15 K.
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solid liquid interface and growth Rate range of al2o3 based eutectic in situ composites grown by laser floating zone melting
Journal of Alloys and Compounds, 2016Co-Authors: Qun Ren, Jun Zhang, Lin Liu, Taiwen Huang, Bin Yao, Min Guo, Wenchao YangAbstract:Abstract Directionally solidified Al 2 O 3 /Er 3 Al 5 O 12 (EAG) eutectic in situ composites are prepared by laser floating zone melting (LFZM) to investigate the solid–liquid interface characteristic and growth Rate range under non-equilibrium Solidification conditions. The solid–liquid ( S–L ) interface is in situ obtained by rapidly quenching, and its microstructure morphology and primary phase based on different eutectic compositions are analyzed. In stable growth zone, the composite presents typically “Chinese script” (CS) irregular eutectic structure consisting of interpenetRated Al 2 O 3 and EAG phases, but in quenched region the regular eutectic lamellae and CS structure are coexisted. Primary Al 2 O 3 phase in hypoeutectic composition is found both in S–L interface front and quenched region. Different from the stable growth zone, in quenched region as the Solidification Rate increases, the eutectic lamellae spacing does not show obvious decrease. The minimum eutectic lamellae spacing is refined to about 200 nm when the Solidification Rate is increased up to 100 μm/s. On the basis, according to the Jackson-Hunt (J-H) model, the maximum Solidification Rate in quenched region is calculated to be smaller than 1.26 × 10 3 μm/s, and the undercooling degree is 4.15 K.
Haijun Su - One of the best experts on this subject based on the ideXlab platform.
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microstructure and cytotoxicity of al2o3 zro2 eutectic bioceramics with high mechanical properties prepared by laser floating zone melting
Ceramics International, 2018Co-Authors: Haijun Su, Enyuan Wang, Jun Zhang, Hui Yang, Hengzhi FuAbstract:Abstract Developing new generation of strong, tough and stable bioceramics used in dental filed has been highly desired for attaining the clinical requirement of secure and reliable therapy. In this paper, a novel Al2O3-ZrO2 eutectic bioceramics with nearly fully density and extremely aesthetic luster was in-situ prepared by innovative laser floating zone melting (LFZM) method. The influence of Solidification Rates on microstructure evolution, mechanical properties and cytotoxicity was investigated. The eutectic bioceramics displayed a special three dimensional interpenetrating microstructure evolving with increasing the Solidification Rate. The eutectic colony structure occurred when Solidification Rate overpassed 8 µm/s, and lamellar spacing was below 1 µm when Solidification Rate exceeded 30 µm/s. The eutectic bioceramics solidified at 100 µm/s exhibited optimal mechanical properties with an average hardness of 16.53 GPa, fracture toughness of 6.5 MPa m1/2 and flexural strength of 1.37 GPa. The cytotoxicity of Al2O3-ZrO2 eutectic bioceramics was evaluated by MTT methods according to ISO 10993-5 standard. Non-cytotoxic behavior was detected for the eutectic bioceramics, indicating this eutectic bioceramic could be used as promising dental restoration material.
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microstructure tailoring and thermal stability of directionally solidified al 2 o 3 gdalo 3 binary eutectic ceramics by laser floating zone melting
Ceramics International, 2018Co-Authors: Haijun Su, Enyuan Wang, Jun Zhang, Di Zhao, Hengzhi FuAbstract:Abstract Directionally solidified Al2O3/GdAlO3 eutectic composite ceramics with low Solidification defects are prepared by laser floating zone melting to tailor homogeneous microstructure and thermal stability performance under high temperature gradient. At low Solidification Rate, the Solidification microstructure shows periodical growth striations in which coarse colony microstructure and homogeneous ‘Chinese script’ irregular eutectic structure are coexisted. The growth striation interval L and Solidification Rate V follow the relationship of L/V = (238.8 ± 2.4) s. By further optimizing laser processing parameters, the eutectic spacing is greatly refined to submicron scale and microstructure oscillation is eliminated at high Solidification Rates, and fully regular lamellar/rod eutectic structures are obtained by faceted eutectic transition. The rod-like eutectic spacing (λ) and Solidification Rate (V) follow the linear relationship of λ·V1/2 = 6.21 µm3/2 s−1/2. Furthermore, the as-solidified eutectic composite even with fine eutectic structure exhibits excellent thermal stability after heat exposure at 1500 °C for 250 h.
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microstructures and mechanical properties of directionally solidified al2o3 gdalo3 eutectic ceramic by laser floating zone melting with high temperature gradient
Journal of The European Ceramic Society, 2017Co-Authors: Haijun Su, Jun Zhang, Hengzhi FuAbstract:Abstract Directionally solidified Al2O3/GdAlO3 eutectic ceramic rods with high densities and low Solidification defects are prepared by laser floating zone melting at Solidification Rate from 2 to 200 μm/s. The microstructure evolution, eutectic growth behavior and mechanical properties are investigated. At low Solidification Rates (
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solid liquid interface and growth Rate range of al2o3 based eutectic in situ composites grown by laser floating zone melting
Journal of Alloys and Compounds, 2016Co-Authors: Haijun Su, Hengzhi Fu, Jun Zhang, Taiwen Huang, Wenchao YangAbstract:Abstract Directionally solidified Al 2 O 3 /Er 3 Al 5 O 12 (EAG) eutectic in situ composites are prepared by laser floating zone melting (LFZM) to investigate the solid–liquid interface characteristic and growth Rate range under non-equilibrium Solidification conditions. The solid–liquid ( S–L ) interface is in situ obtained by rapidly quenching, and its microstructure morphology and primary phase based on different eutectic compositions are analyzed. In stable growth zone, the composite presents typically “Chinese script” (CS) irregular eutectic structure consisting of interpenetRated Al 2 O 3 and EAG phases, but in quenched region the regular eutectic lamellae and CS structure are coexisted. Primary Al 2 O 3 phase in hypoeutectic composition is found both in S–L interface front and quenched region. Different from the stable growth zone, in quenched region as the Solidification Rate increases, the eutectic lamellae spacing does not show obvious decrease. The minimum eutectic lamellae spacing is refined to about 200 nm when the Solidification Rate is increased up to 100 μm/s. On the basis, according to the Jackson-Hunt (J-H) model, the maximum Solidification Rate in quenched region is calculated to be smaller than 1.26 × 10 3 μm/s, and the undercooling degree is 4.15 K.
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microstructure and field emission properties of the si tasi2 eutectic in situ composites by electron beam floating zone melting technique
Journal of Crystal Growth, 2008Co-Authors: Jun Zhang, Haijun Su, Hengzhi FuAbstract:Abstract The directionally solidified Si–TaSi 2 eutectic in situ composites, which have highly aligned and uniformly distributed TaSi 2 fibers embedded in the Si continuous matrix, are obtained by electron beam floating zone melting (EBFZM) technique at the Solidification Rate range 0.3–9.0 mm/min. The preferential orientation of the Si–TaSi 2 eutectic is also studied by selected area electron diffraction (SAED), which is [0 1¯ 1¯]Si∥[0 0 0 1]TaSi 2 and (0 1¯ 1)Si∥(0 1¯ 1 1)TaSi 2 . Moreover, field emission properties of the Si–TaSi 2 eutectic in situ composites are investigated by transparent anode imaging technology. Approximately straight F–N curves show that this material has excellent field emission properties.
Lin Liu - One of the best experts on this subject based on the ideXlab platform.
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solid liquid interface and growth Rate range of al2o3 based eutectic in situ composites grown by laser floating zone melting
Journal of Alloys and Compounds, 2016Co-Authors: Qun Ren, Jun Zhang, Lin Liu, Taiwen Huang, Bin Yao, Min Guo, Wenchao YangAbstract:Abstract Directionally solidified Al 2 O 3 /Er 3 Al 5 O 12 (EAG) eutectic in situ composites are prepared by laser floating zone melting (LFZM) to investigate the solid–liquid interface characteristic and growth Rate range under non-equilibrium Solidification conditions. The solid–liquid ( S–L ) interface is in situ obtained by rapidly quenching, and its microstructure morphology and primary phase based on different eutectic compositions are analyzed. In stable growth zone, the composite presents typically “Chinese script” (CS) irregular eutectic structure consisting of interpenetRated Al 2 O 3 and EAG phases, but in quenched region the regular eutectic lamellae and CS structure are coexisted. Primary Al 2 O 3 phase in hypoeutectic composition is found both in S–L interface front and quenched region. Different from the stable growth zone, in quenched region as the Solidification Rate increases, the eutectic lamellae spacing does not show obvious decrease. The minimum eutectic lamellae spacing is refined to about 200 nm when the Solidification Rate is increased up to 100 μm/s. On the basis, according to the Jackson-Hunt (J-H) model, the maximum Solidification Rate in quenched region is calculated to be smaller than 1.26 × 10 3 μm/s, and the undercooling degree is 4.15 K.
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effect of Solidification Rate on grain structure evolution during directional Solidification of a ni based superalloy
Journal of Materials Science & Technology, 2013Co-Authors: Xiaoli Zhang, Yizhou Zhou, Tao Jin, Xiaofeng Sun, Lin LiuAbstract:The effect of Solidification Rate on grain structure evolution during directional Solidification (DS) of a Ni-based superalloy was explored. It was found that a high Solidification Rate led to sharper texture and smaller grain size in the DS samples. One of the most important findings in this work was that such result was not in accordance with the general concept, and the sharper texture was accompanied by the larger grain size. To explain the contradiction, the modeling samples with five grains were produced and the effect of Solidification Rate on the evolution of grain texture was illustRated based on the modeling samples.
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effect of growth Rate on rod spacing and undercooling of bridgman grown si tasi2 eutectic in situ composite
Journal of Alloys and Compounds, 2013Co-Authors: Xinyu Yang, Jun Zhang, Ziqi Jie, Lin LiuAbstract:Abstract Directionally solidified Si–6 wt.%TaSi2 eutectic alloy has been studied to characterize the variation of inter-rod spacing at different growth Rates (V = 6–200 μm/s) with a constant temperature gradient (210 K/cm). Statistical distributions of inter-rod spacings at each Solidification Rate are determined. It is confirmed that the relationship between inter-rod spacing and Solidification Rate obeys the Magnin–Kurz model, and the theoretical value of λ a 2 V = 5435.6 μm3/s (λa is the average inter-rod spacing) approximately equals to the experimental value of λ a 2 V1.06 = 5343.6 μm3.06/s. For the Si–TaSi2 system, the operating parameter ϕ is a function of the Solidification Rate due to the transition of the TaSi2 phase from facet to nonfacet, and as the Solidification Rate increases the kinetic undercooling cannot be ignored.
Wenchao Yang - One of the best experts on this subject based on the ideXlab platform.
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solid liquid interface and growth Rate range of al2o3 based eutectic in situ composites grown by laser floating zone melting
Journal of Alloys and Compounds, 2016Co-Authors: Haijun Su, Hengzhi Fu, Jun Zhang, Taiwen Huang, Wenchao YangAbstract:Abstract Directionally solidified Al 2 O 3 /Er 3 Al 5 O 12 (EAG) eutectic in situ composites are prepared by laser floating zone melting (LFZM) to investigate the solid–liquid interface characteristic and growth Rate range under non-equilibrium Solidification conditions. The solid–liquid ( S–L ) interface is in situ obtained by rapidly quenching, and its microstructure morphology and primary phase based on different eutectic compositions are analyzed. In stable growth zone, the composite presents typically “Chinese script” (CS) irregular eutectic structure consisting of interpenetRated Al 2 O 3 and EAG phases, but in quenched region the regular eutectic lamellae and CS structure are coexisted. Primary Al 2 O 3 phase in hypoeutectic composition is found both in S–L interface front and quenched region. Different from the stable growth zone, in quenched region as the Solidification Rate increases, the eutectic lamellae spacing does not show obvious decrease. The minimum eutectic lamellae spacing is refined to about 200 nm when the Solidification Rate is increased up to 100 μm/s. On the basis, according to the Jackson-Hunt (J-H) model, the maximum Solidification Rate in quenched region is calculated to be smaller than 1.26 × 10 3 μm/s, and the undercooling degree is 4.15 K.
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solid liquid interface and growth Rate range of al2o3 based eutectic in situ composites grown by laser floating zone melting
Journal of Alloys and Compounds, 2016Co-Authors: Qun Ren, Jun Zhang, Lin Liu, Taiwen Huang, Bin Yao, Min Guo, Wenchao YangAbstract:Abstract Directionally solidified Al 2 O 3 /Er 3 Al 5 O 12 (EAG) eutectic in situ composites are prepared by laser floating zone melting (LFZM) to investigate the solid–liquid interface characteristic and growth Rate range under non-equilibrium Solidification conditions. The solid–liquid ( S–L ) interface is in situ obtained by rapidly quenching, and its microstructure morphology and primary phase based on different eutectic compositions are analyzed. In stable growth zone, the composite presents typically “Chinese script” (CS) irregular eutectic structure consisting of interpenetRated Al 2 O 3 and EAG phases, but in quenched region the regular eutectic lamellae and CS structure are coexisted. Primary Al 2 O 3 phase in hypoeutectic composition is found both in S–L interface front and quenched region. Different from the stable growth zone, in quenched region as the Solidification Rate increases, the eutectic lamellae spacing does not show obvious decrease. The minimum eutectic lamellae spacing is refined to about 200 nm when the Solidification Rate is increased up to 100 μm/s. On the basis, according to the Jackson-Hunt (J-H) model, the maximum Solidification Rate in quenched region is calculated to be smaller than 1.26 × 10 3 μm/s, and the undercooling degree is 4.15 K.