Creep Mechanism of Polycrystalline Yttrium Aluminum Garnet

The high‐temperature deformation behavior of a fine‐grained polycrystalline yttrium aluminum garnet (YAG) was studied in the temperature range of 1400° to 1610°C using constant strain rate compression tests under strain rates ranging from 10−5/s to 10−3/s. The stress exponent of the creep rate, the...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 1992-07, Vol.75 (7), p.1756-1759
Main Authors: Parthasarathy, Triplicane A., Mah, Tai-Il, Keller, Kristen
Format: Article
Language:English
Subjects:
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Chemical industry and chemicals
creep
diffusivity
Exact sciences and technology
mechanism
Miscellaneous
polycrystalline materials
Technical ceramics
yttrium aluminum garnet
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Summary:The high‐temperature deformation behavior of a fine‐grained polycrystalline yttrium aluminum garnet (YAG) was studied in the temperature range of 1400° to 1610°C using constant strain rate compression tests under strain rates ranging from 10−5/s to 10−3/s. The stress exponent of the creep rate, the activation energy in comparison with that for single‐crystal YAG, and the grain size dependence suggest that Nabarro–Herring creep rate limited by the bulk diffusion of one of the cations (Y or Al) is the operative mechanism.
ISSN:0002-7820
1551-2916
DOI:10.1111/j.1151-2916.1992.tb07193.x