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Creep Mechanism of Polycrystalline Yttrium Aluminum Garnet
Author(s) -
Parthasarathy Triplicane A.,
Mah TaiIl,
Keller Kristen
Publication year - 1992
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1992.tb07193.x
Subject(s) - creep , materials science , yttrium , crystallite , strain rate , activation energy , atmospheric temperature range , deformation mechanism , composite material , deformation (meteorology) , diffusion creep , grain size , aluminium , metallurgy , mineralogy , stress (linguistics) , grain boundary , thermodynamics , microstructure , geology , chemistry , physics , oxide , linguistics , philosophy
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.