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EN
The aim of this study was the application of tomographic techniques (focused ion beam-scanning electron microscopy, scanning transmission electron microscopy-energy-dispersive X-ray spectroscopy) to qualitative and quantitative characterization of structural elements in T/P92 creep resistant 9% Cr steel, Allvac 718Plus Ni-based superalloy and W-based alloy - multiphase materials for environmentally friendly power plants exposed to extreme operational conditions. The study showed that tomography techniques permit to obtain complementary information about microstructural features (precipitates size, shape and their spatial distribution) in the reconstructed volume with comparison to conventional particle analysis methods, e.g. quantitative transmission electron microscopy and scanning electron microscopy metallography.
EN
To improve the stability of bone-material connection various surface modifications are applied to titanium based implants. Such new biomaterials require detailed characterization, including their biocompatibility. In the present study focused ion beam-scanning electron microscope tomography was applied to investigate the internal structure of ceramic coating as well as cell-material interface. Focused ion beam-scanning electron microscope tomography involves repeated focused ion beam milling and subsequent scanning electron microscope imaging of exposed sample surface and is followed by 3D reconstruction. This approach enables receiving additional information about the sample, unavailable at 2D images. The qualitative and quantitative investigation of pores in the ceramic coating was performed. The porosity of investigated volume: 8.5× 1.1× 3.9 μm³ was calculated as 24%. Additionally, based on 3D reconstruction the visualization of the coherent interface between cell and ceramic coating was done.
EN
The formation of thin oxide films on {111} and {110} single crystal specimens of Fe20Cr5Al based oxide dispersion strengthened alloy during the early stages of oxidation up to 1000°C was investigated by atomic force microscopy. The atomic force microscopy results revealed the crystalline character of a corrosion layer. The alumina scale morphology (height and grain size of crystallites) was only slightly dependent on the crystallographic texture of the underlying bulk material. The results show that atomic force microscopy has the potential to study surface structure of oxide layers in the initial stages of an oxidation process.
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