Mechanically Induced Zone Darkening of Alumina/Ceria-Stabrlized Zirconia Composites
作者： Valter Sergo , Chiara Schmid , Sergio Meriani , Anthony G. Evans
DOI: 10.1111/J.1151-2916.1994.TB04533.X
关键词: X-ray photoelectron spectroscopy 、 Microstructure 、 Composite material 、 Ultimate tensile strength 、 Residual stress 、 Cubic zirconia 、 Aluminium oxides 、 Materials science 、 Deformation bands 、 Cerium
摘要: Alumina/ceria-stabilized zirconia bars tested in four-point bending exhibited deformation bands on the tensile side due to localized tetragonal-to-monoclinic transformation. These became increasingly darker and were fully visible some weeks after experiment. XPS spectra revealed that regions are characterized by a higher concentration of cerium + 3 oxidation state, as opposed other undeformed regions, which 4 is predominant state. A numerical calculation established residual stresses exist bands. It suggested these facilitate reduction with gradient stress motivating diffusion oxygen vacancies.
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