Abstract
The compression creep behavior of fine-grained two-phase Al2O3–Y3Al5O12 (matrix) materials was investigated over the temperature range 1400–1500°C under applied stresses 3 and 20 MPa. The fine-grained two-phse Al2O3–Y3Al5O12 materials exhibited brief normal primary creep transiet (less than 2%) prior to steady-state behavior with stress exponents close to unity, suggesting that the deformation was controlled by a diffusional creep mechanism. The activation energy for creep of the two-phase materials was between 592 and 612 kJ mol−1, which is within the range of values reported for creep of both single-phase Al2O3and Y3Al5O12. The creep data of the two-phase materials correlated well with the predicted behavior based on the isostress model, suggesting that the creep behavior of the two-phase materials is most probably controlled by the faster deforming phase.
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