Laser zone remelting of Al2O3/Er3Al5O12 bulk oxide in situ composite thermal emission ceramics: Influence of rapid solidification

Su, Hai Jun; Zhang, Jun; Ren, Qun; Deng, Yangfang; Liu, L; Fu, Hengzhi; Soh, Ai Kah

doi:10.1016/j.materresbull.2012.11.052

Cited by 11 publications

(6 citation statements)

References 43 publications

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“…These results are consistent with the results of Su [17]. Compared with the sintered ceramic, the diffraction peaks of the solidified ceramic become sharp and narrow, and their intensity also increases greatly.…”

Section: Resultssupporting

confidence: 92%

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Microstructure and Mechanical Properties of Al2O3/Er3Al5O12 Binary Eutectic Ceramic Prepared by Bridgman Method

et al. 2018

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Directionally solidified Al2O3/Er3Al5O12 (EAG) eutectic ceramic was prepared via vertical Bridgman method with high-frequency induction heating. The effects of the growth rate on the microstructure and mechanical properties of the solidified ceramic were investigated. The experimental results showed that there were no pores or amorphous phases in the directionally solidified Al2O3/EAG eutectic ceramic. Al2O3 phase was embedded in the EAG matrix phase, and the two phases were intertwined with each other to form a typical binary eutectic “hieroglyphic” structure. With the increase of growth rate, the phase size and spacing of the solidified Al2O3/EAG ceramic both decreased, and the growth rate and phase spacing satisfied the λ2v ≈ 60 formula of Jackson-Hunt theory. The cross section microstructure of the solidified ceramic always exhibited an irregular eutectic growth, while the longitudinal section microstructure presented a directional growth. The mechanical properties of the solidified ceramic gradually increased with the increase of growth rate, and the maximum hardness and fracture toughness could reach 21.57 GPa and 2.98 MPa·m1/2 respectively. It was considered that the crack deflection and branching could enhance the toughness of the solidified ceramic effectively.

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Section: Resultssupporting

confidence: 92%

“…However, the growth rate plays a decisive role once the temperature gradient is determined [17,22]. During the preparation of eutectic materials, if the eutectic structure can grow steadily in the eutectic symbiotic region, a specific supercooling degree is required.…”

Section: Resultsmentioning

confidence: 99%

Microstructure and Mechanical Properties of Al2O3/Er3Al5O12 Binary Eutectic Ceramic Prepared by Bridgman Method

et al. 2018

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“…Therefore, the beam is applied on a highly localized area, while the remainder of the material adjacent to the weld fillet is at ambient temperature. Due to this characteristic of the LSR-treated surface, high cooling rates are generated during solidification, which have been studied by Pariona et al [1] and Su et al [29]. However in Fig.…”

Section: Numerical Resultsmentioning

confidence: 96%

Simulation and optimization of Al–Fe aerospace alloy processed by laser surface remelting using geometric Multigrid solver and experimental validation

et al. 2015

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“…There are several available methods, which have been developed in the past, that can be adopted to solidify alumina-based nanoeutectic ceramics in the laboratory, such as laserheated float zoning (LFZ) [8,13,14,26,[28][29][30]32,[34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50][51][52][53], micro-pulling-down (µ-PD) [23,54], aero-acoustic levitators [55], high-energy density beam (HEDB) (laser or oxy-acetylene flame) surface (zone) (re)melting [24,33,[56][57][58][59][60][61][62][63][64][65][66][67][68], plasma spraying [69,70], directed energy deposition (DED)…”

Section: Solidification Techniques For Nanocrystalline Alumina-zircon...mentioning

confidence: 99%

Nanocrystalline Alumina-Zirconia-Based Eutectic Ceramics Fabricated with High-Energy Beams: Principle, Solidification Techniques, Microstructure and Mechanical Properties

et al. 2023

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Nanocrystalline alumina-zirconia-based eutectic ceramics fabricated with high-energy beams and composed of ultrafine, three-dimensionally entangled, single-crystal domains are a special category of eutectic oxides that exhibit exceptionally high-temperature mechanical properties, such as strength and toughness as well as creep resistance. This paper aims to provide a comprehensive review on the basic principles, advanced solidification processes, microstructure and mechanical properties of alumina-zirconia-based eutectic ceramics, with particular attention to the status of the art on a nanocrystalline scale. Some basic principles of coupled eutectic growth are first introduced based on previously reported models, followed by concise introduction of solidification techniques and the control strategy of solidification behavior from the processing variables. Then, the microstructural formation of nanoeutectic structure is elucidated with regard to different hierarchical scales, and mechanical properties such as hardness, flexural and tensile strength, fracture toughness and wear resistance are discussed in detail for a comparative study. Nanocrystalline alumina-zirconia-based eutectic ceramics with unique microstructural and compositional characteristics have been produced with high-energy beam-based processes, and in many cases, promising improvements in mechanical performance have been reported as contrasting with conventional eutectic ceramics.

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Laser zone remelting of Al2O3/Er3Al5O12 bulk oxide in situ composite thermal emission ceramics: Influence of rapid solidification

Cited by 11 publications

References 43 publications

Microstructure and Mechanical Properties of Al2O3/Er3Al5O12 Binary Eutectic Ceramic Prepared by Bridgman Method

Microstructure and Mechanical Properties of Al2O3/Er3Al5O12 Binary Eutectic Ceramic Prepared by Bridgman Method

Simulation and optimization of Al–Fe aerospace alloy processed by laser surface remelting using geometric Multigrid solver and experimental validation

Nanocrystalline Alumina-Zirconia-Based Eutectic Ceramics Fabricated with High-Energy Beams: Principle, Solidification Techniques, Microstructure and Mechanical Properties

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