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National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Properties of thin films studied by in-situ TEM
 Bajtošová, Lucia ; Cieslar, Miroslav (advisor) ; Kopeček, Jaromír (referee)
Mechanical properties of widely applicable thin nanocrystalline films have been a sub- ject of interest for some time due to deviation of their properties from the properties of bulk and micro sized grain materials. The deformation mechanisms in these materials are altered by restricted size of the material and high ratio of surface and grain boundary areas. Recent advances in transmission electron microscopy (TEM) allow direct obser- vations of the deformation mechanisms during nanoindentation or tensile deformation of the specimen. Thin Al films prepared by DC magnetron sputtering were deformed in situ in TEM and bright field TEM. High resolution TEM and automated crystallographic orientation mapping (ASTAR) were implemented to observe the ongoing deformation mechanisms. Molecular dynamic simulation designed to approach the conditions of per- formed experiment were used to visualize the deformation mechanisms on atomic scale and the reliability of both methods was discussed. 1
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Distribution of dispersoids in rapidly solidified aluminium alloys.
 Bajtošová, Lucia ; Cieslar, Miroslav (advisor) ; Šíma, Vladimír (referee)
Dispersoids formed during rapid solidification of a quaternary Al-Fe-Mn-Si alloy prepared by twin-roll casting and their transformation after following heat treatment were studied. A conventional transmission electron microscopy and modern automated phase identification methods such as electron backscatter diffraction in scanning electron microscope and automated orientation crystal phase and orientation mapping in transmission microscopy were applied. Energy dispersive X-ray spectroscopy was used to determine the chemical composition of the dispersoids. The phase identification methods were tested on as cast samples and samples annealed for 4 hours at 580 žC. Strategies for statistical evaluation of particle distribution and their crystallographic structure were discussed.
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4 Bajtošová, Lenka
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