Influence of Moisture on Ultra-High-Temperature Tensile Creep Behavior of in Situ Single-Crystal Oxide Ceramic Alumina/Yttrium Aluminum Garnet Eutectic Composite |
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| Authors: | Yoshihisa Harada Takayuki Suzuki Kazumi Hirano Yoshiharu Waku |
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| Affiliation: | Institute of Mechanical Systems Engineering, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8564, Japan;Ube Research Laboratory, Corporate Research and Development, UBE Industries, Ltd., Ube, Yamaguchi 755-0001, Japan |
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| Abstract: | Tensile creep tests were conducted for an in situ single-crystal alumina/yttrium aluminum garnet (Al2O3/Y3Al5O12 (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 Al2O3/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 Al2O3 and YAG phases. |
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| Keywords: | water creep alumina yttrium aluminum garnet |
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