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Studium mechanických vlastností supertvrdých nanostrukturních vrstev
Buršíková, V. ; Jašek, O. ; Frgala, Z. ; Karásková, M. ; Zajíčková, L. ; Buršík, Jiří ; Bláhová, O. ; Grančič, B. ; Mikula, M. ; Klapetek, P.
Study of Mechanical Properties of Superhard Nanostructured Thin Films.
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Initial stages of fatigue failure of polycrystalline materials
Man, Jiří ; Petrenec, Martin ; Obrtlík, Karel ; Polák, Jaroslav
Geometry of persistent slip markings (PSMs) formed during cyclic loading of polycrystalline stainless steels and superalloy was studied using atomic force microscopy (AFM) and high-resolution scanning electron microscopy (SEM-FEG). Internal dislocation structure was investigated using transmission electron microscopy (TEM). Persistent slip bands with dislocation structure corresponding to the cyclic strain localization were identified and correlated with PSMs observed on the specimen surface.
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Quantitative assessment of the surface relief in fatigue using AFM
Man, Jiří ; Obrtlík, Karel ; Polák, Jaroslav
Atomic force microscopy (AFM) was applied to study the early stages of fatigue damage in polycrystalline copper and stainless 316L steel. The analysis of the image formation using an AFM tip reveals the lateral distortion of the extrusions and intrusions in case of high extrusions and deep intrusions. The true extrusion height can be obtained in direct observation and the depth of intrusions using replica technique. The evolution of the shape and the height of extrusions allowed to judge the activity of the persistent slip bands (PSBs) during fatigue life.
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Polished Silver Solid Amalgam Electrode
Fadrná, Renata
The polished silver solid amalgam electrode (p-AgSAE) seems to be a suitable alternative to hanging mercury drop electrode (HMDE). The structure of electrode material and working electrode surface were analyzed by RTG diffraction, atomic forces microscopy (AFM) and scanning electron microscopy (SEM). It was found that silver amalgam has crystalline structure (without the presence of different phases), any liquid mercury is not presented on the electrode surface and also mercury is not evaporated from the amalgam. p-AgSAE was applied for the determination of inorganic cations (Cu2+, Pb2+, Cd2+, Zn2+) and anions (NO3-, SCN-), amino acids (cysteine, cystin), nitro compounds (2,4´-dinitritoluene, 1,3´-dinitrobenzene, 2-nitronaftalene), aldehydes (benzaldehyde), vitamin C and purine bases of DNA (adenine, guanine) up to now.
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