Processing, Microstructure, and Strength of Alumina-YAG Eutectic Polycrystals

Dense polycrystalline eutectics of alumina and yttrium aluminum garnet (YAG) were fabricated by hot‐pressing powders of pulverized arc‐melted buttons at homologous temperatures of 0.9Teu–0.93Teu (where Teu is the eutectic temperature). The eutectic microstructure of the arc‐melted buttons was retain...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2000-08, Vol.83 (8), p.2088-2090
Main Authors: Mah, Tai-Il, Parthasarathy, Triplicane A., Kerans, Ronald J.
Format: Article
Language:English
Subjects:
alumina
eutectics
yttrium aluminum garnet
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Summary:Dense polycrystalline eutectics of alumina and yttrium aluminum garnet (YAG) were fabricated by hot‐pressing powders of pulverized arc‐melted buttons at homologous temperatures of 0.9Teu–0.93Teu (where Teu is the eutectic temperature). The eutectic microstructure of the arc‐melted buttons was retained after densification, although the grain boundaries were decorated with equiaxed grains of alumina and YAG ∼1–5 μm in size; possible causes for their formation have been discussed. A comparison of the measured strength of the polycrystalline eutectics (274 ± 61 MPa) with grain size and fracture toughness suggests that the strength‐limiting flaws are significantly smaller than the mean grain size and larger than the mean eutectic spacing.
ISSN:0002-7820
1551-2916
DOI:10.1111/j.1151-2916.2000.tb01518.x