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Influence of Moisture on Ultra‐High‐Temperature Tensile Creep Behavior of in Situ Single‐Crystal Oxide Ceramic Alumina/Yttrium Aluminum Garnet Eutectic Composite
Author(s) -
Harada Yoshihisa,
Suzuki Takayuki,
Hirano Kazumi,
Waku Yoshiharu
Publication year - 2003
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.1151-2916.2003.tb03403.x
Subject(s) - materials science , eutectic system , creep , yttrium , ultimate tensile strength , composite material , composite number , ceramic , stress (linguistics) , dislocation , atmospheric temperature range , metallurgy , crystal (programming language) , oxide , microstructure , thermodynamics , linguistics , philosophy , physics , computer science , programming language
Tensile creep tests were conducted for an in situ single‐crystal alumina/yttrium aluminum garnet (Al 2 O 3 /Y 3 Al 5 O 12 (YAG)) binary system eutectic composite at temperatures between 1773 and 1873 K in air and in a moist environment having a water‐vapor pressure range of 0.06–0.6 MPa, under a constant tensile stress range of 100–160 MPa. The Al 2 O 3 /YAG eutectic composite exhibited a stress exponent of 8–13, indicative of tensile creep behavior characterized by a dislocation back‐stress mechanism. Water‐vapor pressures ≤0.4 MPa led to a significant acceleration of creep rates as a result of enhanced dislocation mobility in the Al 2 O 3 and YAG phases.