Temat: 61.05.J- - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Effect of Annealing Time on Structure of $Fe_{72.5}Cu_{1}Nb_{2}Mo_{2}Si_{15.5}B_{7}$ Alloy
Autorzy:: Nemcová, V.
Girman, V.
Hrabčáková, V.
Michalik, Š.
Bednarčík, J.
Almáši, M.
Sovák, P.
Tematy:: 61.05.cp
61.46.Hk
61.05.J-; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1367403.pdf Link otwiera się w nowym oknie
Opis:: The process of a primary crystallization of the $Fe_{72.5}Cu_{1}Nb_{2}Mo_{2}Si_{15.5}B_{7}$ alloys was investigated by differential thermal analysis (DTA), x-ray diffraction (XRD) and transmission electron microscopy (TEM). Amorphous ribbons were isothermally annealed for 0.5, 2, 6, 30 and 150 minutes at 520 °C. Both, the XRD and TEM study showed that the level of devitrification of the sample increases with the annealing time. The above mentioned techniques confirmed the presence of the nanocrystalline grains of the $Fe_{3}Si$ phase and enable us to study the evolution of the identified phase.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: The Microstructure and Fatigue of Ultrafine-Grained Al-Cu-Mg Alloy
Autorzy:: Islamgaliev, R.
Khafizova, E.
Kulyasova, O.
Nesterov, K.
Ganeev, A.
Golubovskiy, E.
Volkov, M.
Tematy:: 61.05.J-
81.05.Bx; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1402104.pdf Link otwiera się w nowym oknie
Opis:: In this work the influence of equal-channel angular pressing on strength and fatigue of an aluminum alloy has been studied. Transmission electron microscopy was applied to determine an average grain size, shape, and size of precipitates. The ultimate tensile strength and fatigue endurance limit of ultrafine-grained and coarse-grained samples were evaluated at 20°C and 175°C.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Calculations of RHEED and RHEPD rocking curves for growing surfaces of germanium
Autorzy:: Mitura, Z.
Tematy:: 61.05.J-
68.35.B-
81.05.Cy; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1075752.pdf Link otwiera się w nowym oknie
Opis:: Reflection high energy electron diffraction is a popular technique to characterize arrangements of atoms near a surface. However, Japanese researchers recently demonstrated experiments in the same geometry, however, conducted using positrons. In this context, detailed comparisons of basic results expected for diffractions of electrons and positrons seem to be interesting. Subsequently, in the current work the growth of single atomic layers of Ge on the Ge(001) substrate is assumed and intensities of reflected beams for electrons and positrons are computed by using dynamical diffraction theory for the case of the off-symmetry azimuth. Shapes of respective theoretical rocking curves are analyzed and then the features of intensity oscillations expected during the regular, continuous deposition of the material are discussed.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

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.
Tematy:: 81.10.Aj
61.72.Ff
61.05.J-; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1058074.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Nanoquasicrystalline Phase in Mechanically Alloyed and Heat-Treated $Al_{73}Cu_{11}Cr_{16}$
Autorzy:: Sviridova, T.
Shevchukov, A.
Shelekhov, E.
Diakonov, D.
Gorshenkov, M.
Kaloshkin, S.
Tcherdyntsev, V.
Li, Z.
Fan, G.
Tematy:: 61.44.Br
64.70.kd
61.05.cp
61.05.J-; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1373670.pdf Link otwiera się w nowym oknie
Opis:: X-ray diffraction analysis, scanning and transmission electron microscopy, thermal analysis and measurement of chemical composition were implemented to determine structure, thermal stability and chemical composition of the decagonal quasicrystal in $Al_{73}Cu_{11}Cr_{16}$ alloy produced by long-term mechanical alloying of elemental powders followed by annealing at 700°C. According to the TEM investigation such a technique permits to produce a single-phase nanostructural quasicrystal with grain size about 60 nm. Differential thermal analysis revealed that the decagonal phase does not exist above 923°C and undergoes incongruent two-stage melting coming to the end at 1100°C.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Composition and Order-Disorder Transition in the $Cu_3Au$ (001) Surface Layer Investigated with the Use of DAES and DEPES
Autorzy:: Rok, Ł.
Mróz, S.
Tematy:: 61.05.J-
68.35.Rh; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1811500.pdf Link otwiera się w nowym oknie
Opis:: The composition of the first atomic layer of $Cu_3Au$(001) crystal (about half-and-half copper and gold atoms) changes only slowly even at temperatures much higher than that of the order-disorder transition ($T_C$ = 663 K). Theoretical and experimental works show a general trend of these changes but they differ in quantitative findings. In the present work we used directional elastic peak electron spectroscopy and directional Auger electron spectroscopy to investigate changes of atomic order and composition in the first atomic layers of the $Cu_3Au$(001) crystal during the sample temperature increase. The height of central maximum in DEPES polar profile of the sample investigated was measured as a function of sample temperature. It was found that the measured dependence is linear, but the slope of this dependence changes abruptly around $T_C$. This change seems to be connected with disappearance of the atomic order in the first and second atomic layers. In DAES the height of the Auger peaks for copper and gold low energy transitions (MVV and NVV, respectively) were measured in the dN(E)/dE mode as a function of the primary electron beam incidence angle. The composition of the first, second, and third atomic layers was determined by fitting the ratio of calculated DAES polar profiles for copper and gold to such a ratio for the measured profiles.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Directional Auger Electron Spectroscopy - Possibilities, Limitations and Proposal of Improvements
Autorzy:: Mróz, S.
Rok, Ł.
Tematy:: 61.05.J-
68.35.Rh; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1811503.pdf Link otwiera się w nowym oknie
Opis:: Physical foundations of directional auger electron spectroscopy (DAES) and calculation of DAES profiles in single scattering cluster approach are presented. Limitations of this method (application only to investigation of the crystalline structure of homogeneous samples) is shown and explained as the result of participation of inelastically scattered electrons in the Auger signal generation. To extend the DAES application for the interface structure, the use of as low as possible energy of primary electrons is proposed because in such a case the participation of inelastically scattered electrons becomes negligible and single scattering cluster calculation should describe correctly the DAES profiles for interfaces. Besides, the extension of single scattering cluster calculations to the second elastic scattering is recommended. To check the technical possibility of DAES use in the proposed version, the Auger spectrum of Cu LMM peaks was recorded for a $Cu_3Au$(001) sample with the use of a retarding field analyzer with the primary beam energy 1200 eV. Quality of this spectrum seems to be good enough for using in DAES.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Structural Studies with the Use of XRD and Mössbauer Spectroscopy οf $Bi_5Ti_3FeO_{15}$ Ceramic Powders Obtained by Mechanical Synthesis
Autorzy:: Dercz, G.
Rymarczyk, J.
Hanc, A.
Prusik, K.
Babilas, R.
Pająk, L.
Ilczuk, J.
Tematy:: 61.05.Qr
61.05.C-
61.05.J-
81.07.Bc
81.20.Wk; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1811608.pdf Link otwiera się w nowym oknie
Opis:: In this paper the structural and Mössbauer spectral properties of multiferroic ceramic $Bi_5Ti_3FeO_{15}$ powders prepared by high-energy ball milling of polycrystalline precursor material (mixture of $Bi_2O_3$, $TiO_2$ and $Fe_2O_3$ powders) are presented. Mechanical synthesis was performed by high-energy vibratory mill. The X-ray diffraction methods were applied for the structure characterization of the studied samples. The parameters of diffraction line profiles were determined by PRO-FIT Toraya procedure. The crystallite sizes and lattice distortions were analyzed using the Williamson-Hall method. Investigations of hyperfine interactions in the studied materials were carried out by the Mössbauer spectroscopy. The powder morphology was analyzed by scanning electron microscopy and transmission electron microscopy techniques. It was found that during high-energy milling phase transitions, a decrease in crystallite size and amorphization process are observed.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Electron Diffraction Tomography and Dynamical Refinement for Crystal-Structure Characterization of Nanocrystalline Materials
Autorzy:: Corrêa, C.
Klementová, M.
Palatinus, L.
Tematy:: 61.05.J-
61.66.-f
61.46.Km; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1402113.pdf Link otwiera się w nowym oknie
Opis:: Three-dimensional electron diffraction tomography allows one to obtain structure information from nanocrystals. However, in order to get accurate results the dynamical theory must be used due to the strong dynamical interaction between electrons and matter. Full structure refinement using dynamical theory has been in use for some time, in spite of being hampered by the fact that the intensities are very sensitive to variations of thickness and of the orientation of the sample. A remedy to this problem is the technique called precession electron diffraction. The use of precession electron diffraction in combination with electron diffraction tomography results in more accurate structure parameters and lower figures of merit in the structure refinement. The principles of electron diffraction tomography, precession electron diffraction and dynamical refinement will be demonstrated on the structural analysis of a nanowire of Ni₃Si₂.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Tool Steels: Forging Simulation and Microstructure Evolution of Large Scale Ingot
Autorzy:: Mengaroni, S.
Cianetti, F.
Calderini, M.
Evangelista, E.
Di Schino, A.
McQueen, H.
Tematy:: 06.60.Ei
61.05.J-
81.05.Bx; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1402102.pdf Link otwiera się w nowym oknie
Opis:: The aim of this paper is to analyze the hot working behavior of two different steels based on 3% and 5% Cr steel chemistry, respectively. Hot deformation is studied by hot torsion tests in the range of temperatures 1000-1200°C and strain rates 0.01, 0.10, 1.00 $s^{-1}$. At given temperatures and strain rates flow curves exhibit a peak followed by a decline towards a steady state which is indicative of dynamic recrystallization. At constant strain, flow stress increases with increasing strain rate and decreasing temperature. The analysis of the constitutive equation relating peak flow stress, strain rate and temperature shows high activation energy values for both steels. Recrystallized volume fraction of steels after hot deformation is estimated based on the grain orientation spread as measured by electron backscattered diffraction technique, on the hot deformed and quenched materials.
Dostawca treści:: Biblioteka Nauki

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