Anisotropic surface stress on yttria-stabilized zirconia ceramics with femtosecond-laser induced periodic surface structuresWednesday (24.06.2020) 08:40 - 09:00 Room 3
Yttria-stabilized tetragonal zirconia polycrystal (3-mol % Y2O3-doped ZrO2, 3Y-TZP) is a fine engineering ceramic with high fracture resistance and flexural strength. Recently, we reported the first LIPSS formation on 3Y-TZP with a Ti:sapphire femtosecond laser. The periods are comparable to or larger than the laser wavelength , which suggests effect of hydrodynamic for melted surfaces with inhomogeneous laser coupling. In order to understand the LIPSS formation mechanism and the effect of LIPSS formation on mechanical strength, the residual surface stresses before and after the LIPSS formation have been measured by x-ray diffraction peak shifts. The surface stress was anisotropic relative to LIPSS direction. The cross-section of the LIPSS was analyzed with transmission electron microscope and the crystal phase change was evaluated by x-ray diffraction peaks.
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