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    Wyświetlanie 1-4 z 4
    Tytuł:
    Surface Decorations of Al-Cu-Fe and Al-Cu-Co Single Quasicrystals
    Autorzy:
    Surowiec, M.
    Bogdanowicz, W.
    Krawczyk, J.
    Sozańska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1373609.pdf
    Data publikacji:
    2014-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.44.Br
    Opis:
    We studied surface decorations of faceted icosahedral Al-Cu-Fe and decagonal Al-Cu-Co single quasicrystals by the scanning electron microscopy using primary and secondary electrons. Both types of single quasicrystals exhibited decorations on their facets, however the character of the decorations was totally different. Three kinds of decorations has been developed. On icosahedral $Al_{60}Cu_{26}Fe_{14}$ quasicrystals we found three kinds of decorations: cellular, cavity type and fractal-like. There was no evident difference in chemical composition between the inner dodecahedra and the decorations of all types. Surface decorations found on decagonal $Al_{73.5}Cu_{17.5}Co_9$ quasicrystals formed a kind of irregular dendritic stars on the separate bright islands.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 2; 597-598
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mould walls inclination and dendritic morphology of CMSX-4 blades airfoils
    Autorzy:
    Krawczyk, J.
    Bogdanowicz, W.
    Sieniawski, J.
    Kubiak, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1075667.pdf
    Data publikacji:
    2016-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.70.+w
    61.66.Dk
    61.72.Bb
    Opis:
    The airfoils of single-crystalline turbine blades were studied. The blades made of industrial CMSX-4 superalloy were obtained by the Bridgman technique. Five different withdrawal rates (1-5 mm/min) were used. Series of as-cast samples were prepared by cutting the airfoils at different distances from the blade root. The metallographic sections, prepared for each cutting planes, were subjected to scanning electron microscopy observations and Laue diffraction studies. Macrostructure images of whole area of airfoil cross-sections were obtained by stitching several obtained SEM images. Morphology of dendrites in different area of cross-sections were analysed. The crystal orientation of each sample were determined by analysis of Laue pattern. It was found that the morphology of dendrites changes in the area, where the dendrite growth is limited by inclined mould walls.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 4; 1100-1103
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dendrite growth in selector-root area of single crystal CMSX-4 turbine blades
    Autorzy:
    Bogdanowicz, W.
    Tondos, A.
    Krawczyk, J.
    Albrecht, R.
    Sieniawski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1058103.pdf
    Data publikacji:
    2016-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.66.Dk
    61.72.-y
    61.10.Nz
    Opis:
    The single crystal turbine blades made of CMSX-4 nickel-based superalloy were studied. The turbine blades were obtained by the Bridgman technique with withdrawal rate of 5 mm/min. The samples, cut-off from root part of blades and containing the fragment of the selector, were studied. The effect of selector geometry on the dendrites growth and defects formation in the selector-root area of the blade were analyzed. The Laue diffraction, scanning electron microscopy, and X-ray diffraction topography were applied. It was found that, during crystallization of the selector, the dendrite cores, after reaching the surface of mould, may bend, if the angle between dendrite cores and the mould surface was equal to 12°. When the angle was equal to 24° the growth of dendrites has been stopped. It can be stated that the defects, which appeared in the selector were inherited by the root part.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 4; 1107-1109
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of CMSX-4 single-crystalline turbine blades root by electron and X-ray diffraction methods
    Autorzy:
    Krawczyk, J.
    Zubko, M.
    Bogdanowicz, W.
    Tondos, A.
    Sieniawski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1058074.pdf
    Data publikacji:
    2016-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.10.Aj
    61.72.Ff
    61.05.J-
    Opis:
    The root of single-crystalline turbine blade made of CMSX-4 superalloy were studied. The studied blade was produced by the Bridgman technique in industrial ALD furnace at withdrawal rate of 3 mm/min. The samples for investigations were cut from the blade root parallel to the withdrawal direction. Metallographic sections of longitudinal samples planes were prepared for further investigations. The samples were analysed using scanning electron microscopy and the Laue diffraction studies. The crystal orientations in macro-scale were determined by analysis of the Laue pattern and local crystal orientations were studied by electron backscattered diffraction technique. Morphology of dendrites were examined by analysis of scanning electron microscopy macro-images. Study of subgrain structure was performed by X-ray diffraction topography. The sharp parallel contrast bands, visible on the X-ray topograms, were related with dendrite cores, arranged with the same direction. Additionally, the low angle boundaries were formed in certain samples, visible on the topograms as contrast shifts. Step changes of local crystal orientation in certain areas were observed on the electron backscattered diffraction maps. The electron backscattered diffraction crystal orientation maps were related to the misorientation visualized in topograms.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 4; 1104-1106
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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