Journal of the American Ceramic Society · 1992 · 117 citations · 13 references
Natural SciencesMaterials EngineeringMaterials ScienceCeramicsMaterials ThermodynamicsMechanical Behavior Of MaterialsCreep BehaviorCreep DeformationDeformation MechanismsGrain Structure AnalysisPlastic DeformationStress-strain BehaviorActivation EnergyBulk DiffusionCreep MechanismsCreep RateCreep Under Strain RateDeformation BehaviorNabarro-herring CreepStress Exponent
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.
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