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Microstructures and mechanical properties of Al2O3/YAG:Ce3+ eutectics with different Ce3+ concentrations grown by HDS method
Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Automatic control. Harbin Inst Technol, Natl Key Lab Sci & Technol Adv Composites Special, Harbin 150001, Heilongjiang, Peoples R China.
Harbin Inst Technol, Natl Key Lab Sci & Technol Adv Composites Special, Harbin 150001, Heilongjiang, Peoples R China.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Materials Science and Engineering, Applied Material Science.
Harbin Inst Technol, Natl Key Lab Sci & Technol Adv Composites Special, Harbin 150001, Heilongjiang, Peoples R China.
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2020 (English)In: Journal of Alloys and Compounds, ISSN 0925-8388, E-ISSN 1873-4669, Vol. 816, article id 152515Article in journal (Refereed) Published
Abstract [en]

The Al2O3/YAG:Ce3+ eutectics (170 mm x 90 mm x 20 mm) with different Ce3+ concentrations, which could be used as structural members and new type of fluorescent materials, were grown by the horizontal directional solidification method. Variations in the microstructures of the eutectics, such as the three-dimensional cross distribution of coarse and fine microstructure regions caused by Ce doping, were directly presented by mu CT. The residual compressive stress in the Al2O3 phases increased with the increase of Ce concentration in the eutectics. Although the Young's modulus, Vickers hardness, and fracture toughness of our eutectics decreased slightly with the increase of Ce concentration, the values were still in the range of the prior results. The flexural and compressive strength of the eutectics were also measured from room temperature to 1273 K. The flexural strength of these eutectics decreased with an increase in Ce concentration. But the eutectic with Ce/Y = 0.25% exhibited a higher compressive strength (1946 MPa) compared to that of the eutectic with Ce/Y = 0% (similar to 1200 MPa). Therefore, the controlled use of the Ce ions additive is an attractive option to improve the compressive strength of the Al2O3/YAG eutectics.

Place, publisher, year, edition, pages
2020. Vol. 816, article id 152515
Keywords [en]
Al2O3/YAG:Ce3+ eutectic, Horizontal directional solidification method, 3D microstructure, Mechanical properties
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:uu:diva-402620DOI: 10.1016/j.jallcom.2019.152515ISI: 000503725300101OAI: oai:DiVA.org:uu-402620DiVA, id: diva2:1386492
Available from: 2020-01-17 Created: 2020-01-17 Last updated: 2020-01-17Bibliographically approved

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Yang, LiuWu, DanXia, Wei

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