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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.
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Harada et al. (2003) studied this question.
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