A comparative study of superplastic deformation and cavitation behaviour in 3 and 8 mol.% yttria-stabilized zirconia
作者： S Tekeli , T.J Davies
DOI: 10.1016/S0921-5093(00)01259-4
关键词:
摘要: Superplastic deformation, grain boundary structure and cavitation behaviour during high temperature tensile testing in fine-grained 3 8 mol.% yttria-stabilized zirconia have been compared. The yttria stabilized (8Y-CSZ) had a single cubic phase, while the (3Y-TZP) was predominantly tetragonal. Extensive ductility obtained 3Y-TZP, reaching ∼283% at 1673 K 1×10−4 s−1, whereas under same test conditions, elongation 8Y-CSZ limited to ∼20%. These differences were related segregation of cation boundaries. Transmission electron microscopy (TEM) observations with energy dispersive spectrometer (EDS) analyses revealed strong on boundaries 3Y-TZP; this suppressed growth lowered mobilities. There no evidence preferential 8Y-CSZ. Internal cavities developed both materials superplastic deformation. results demonstrated that extent much higher than 3Y-TZP. In 8Y-CSZ, most propagated direction perpendicular axis as ceramics (with increasing strain these grew interlinked form cracks leading failure relatively low strains), whereas, 3Y-TZP elongated parallel metals. This difference arose from severe
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