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Preparation of large-size Al_(2)O_(3)/GdAlO_(3)/ZrO_(2)ternary eutectic ceramic rod by laser directed energy deposition and its microstructure homogenization mechanism

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Journal of Materials Science & Technology 2021年第26期85卷 218-223页

作者： Haifang Liu Haijun Su Zhonglin Shen Di Zhao Yuan Liu Yinuo Guo Min Guo Jun Zhang Lin Liu Hengzhi Fu State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an710072China

Laser 3D printing based on melt growth has great potential in rapid preparation of Al_(2)O_(3)-based eutectic ce *** this work,la rge-scale Al_(2)O_(3)/GdAlO_(3)/ZrO_(2)ternary eutectic ceramic rod with diameter of 4-5 mm and height higher than 250 mm was additively manufactured by laser directed energy ***,heat treatment was applied to eliminate the microstructure heterogeneity in the as-deposited eutectic ceramic,and the microstructure homogenization mechanism was studied in *** results indicate that colonies and banded structures completely disappear after the heat treatment,producing a homogeneous network eutectic *** microstructure homogenization is revealed to experience three stages of discontinuous coarsening,continuous coarsening and microstructure ***,it is found that the eutectic spacing linearly increases with the heat treatment time,meaning that the coarsening behavior of the laser 3D-printed Al_(2)O_(3)/GdAlO_(3)/ZrO_(2)eutectic ceramic satisfies well with the Graham-Kraft model.

关键词： Oxide eutectic ceramic Laser 3D printing Melt growth Heat treatment microstructure homogenization

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Inner Oxide Fabrication and Severe Plastic Deformation microstructure homogenization of Silver Cerium Oxide Composites

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Journal of Rare Earths 2006年第S2期 21-24页

作者：周晓龙陈敬超曹建春杜焰张昆华孙加林 Key Laboratory of Advanced Materials of Yunnan Province Kunming University of Science and Technology Faculty of Materials and Metallurgy Engineering Kunming University of Science and Technology Yunnan Province Association for Science and Technology

Fabrication of silver thulium oxide by inner oxide method was researched. The result shows that the microstructure is no-homogenization as particles reinforcing metal matrix composites. The CeO2 particles exist in inner silver cerium alloy. This no-homogenization microstructure can not be dispersed by general extrusion technology. Severe plastic deformation was adopted to disperse the CeO2 particles. The result shows that the microstructure is homogeneous and the CeO2 particles are dispersed after severe plastic deformation. The relationship between true strain (η) of severe plastic deformation and diameter (d0, d) of particles, which is η≈ln(d20/d2), was also discussed.

关键词： silver cerium oxide composites microstructure homogenization rare earths

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