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    Wyświetlanie 1-10 z 10
    Tytuł:
    Vacancy Formation in Fe-Al of B2 and $DO_3$ Alloys
    Autorzy:
    Kansy, J.
    Hanc, A.
    Giebel, D.
    Jabłońska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1812532.pdf
    Data publikacji:
    2008-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.70.Bj
    71.55.Ak
    Opis:
    The positron lifetime spectroscopy is employed to study vacancy formation in intermetallic phases of $DO_3$ and B2 structures from Fe-Al system as a function of Al concentration, ternary additive (Cr) and their thermal treatment. Lifetime spectra were fitted en block by a simple trapping model encoded directly to the software (computer program LT-9). In the investigated range of Al concentration (28, 38, 42, and 45 at%) only two types of defects are found. In $DO_3$ region a single type of defects (characterized by positron lifetime $τ_1$=170±2 ps) is detected and indicated as vacancies in the Fe sublattice $(V_{Fe})$. In B2 region a small amount of an additional type of defects (characterized by positron lifetime $τ_2$=214±13 ps) appears. Supposedly, these are vacancies in Al sublattice $(V_{Al})$. For Fe28Al and Fe28Al5Cr samples changes in $V_{Fe}$ concentration are determined as a function of the sample composition, annealing time at 1000°C and quenching the samples to air and oil. The defect concentration increases with increase in Al content. For FeAl with Al above 38 at%, the total concentration of defects is so high that positrons are exclusively trapped by defects. Therefore the concentrations $V_{Al}$ and $V_{Fe}$ cannot be determined separately. However, the ratio of $V_{Al}$ concentration to $V_{Fe}$ concentration is estimated as a function of Al content.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 5; 1409-1415
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Deformation microstructures in metallic materials after severe plastic deformation by rolling with cyclic movement of rolls
    Autorzy:
    Urbańczyk-Gucwa, A.
    Bednarczyk, I.
    Jabłońska, M.
    Rodak, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1075888.pdf
    Data publikacji:
    2016-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    62.20.F-
    61.72.Ff
    81.05.Bx
    81.40.Rs
    83.50.-v
    Opis:
    The results of the microstructure investigations of the pure Al and AlMg5 alloy and pure Cu and CuFe2 alloy after the application of severe plastic deformation implemented by rolling with the cyclic movement of the rolls are presented in this paper. The rolling with the cyclic movement of the rolls was carried out at values: the rolling rate v=1 rpm, the frequency of rolls movement f=1 Hz, the amplitude of rolls movement A=1.6 mm. Maximal values of rolling reduction at 6 passes was ε_{h}=80%. The structure of the these materials was analyzed using scanning transmission electron microscope. The quantitative studies of the substructure was performed with MET-ILO software, on the basis of images acquired on scanning transmission electron microscope. Performed substructure investigations showed that using the rolling with the cyclic movement of the rolls method can refine the microstructure of these materials to the ultrafine scale.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 4; 975-978
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Heat treatment of CuFe2 and CuCr0.6 alloys and the effect of precipitates on the grain refinement
    Autorzy:
    Urbańczyk-Gucwa, A.
    Amrogowicz, P.
    Jabłońska, M.
    Rodak, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1075903.pdf
    Data publikacji:
    2016-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.40.Gh
    62.20.F-
    61.72.Ff
    81.05.Bx
    81.40.Rs
    Opis:
    The results of microstructure and hardness investigations of the CuFe2 and CuCr0.6 alloys after solution and ageing treatment are presented in this paper. The variants of heat treatment as: solution at 1000°C per 3 h and ageing treatment at 500°C for 2 h and at 700°C for 24 h were chosen for severe plastic deformation process realized by rolling with the cyclic movement of rolls method. The structure of CuFe2 and CuCr0.6 alloys was analysed using scanning transmission electron microscopy, and the quantitative studies of the substructure was performed with MET-ILO software, on the basis of images acquired on scanning transmission electron microscope.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 4; 1016-1019
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of dislocation substructures in high-Mn steels after dynamic deformation tests
    Autorzy:
    Śmiglewicz, A.
    Moćko, W.
    Rodak, K.
    Bednarczyk, I.
    Jabłońska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1058094.pdf
    Data publikacji:
    2016-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Bx
    81.40.-z
    68.37.Ma
    46.70.-p
    Opis:
    The article presents the dynamic mechanical properties of two types of high manganese austenitic TWIP steels. The investigations were carried out for the wide range of strain rates from 10¯² s¯¹ up to 4×10³ s¯¹ using servo-hydraulic testing machine and split Hopkinson bar for the quasi-static and dynamic loading regime, respectively. The mechanical properties at different strain rates like yield strength and true stress were calculated out on the base of the results of impact tests. In the next step, the microstructure of the analyzed steels after different deformation rates were observed by scanning transmission electron microscopy technique in order to disclose a dislocation structures and mainly the TWIP effect. In the studies observed that with the strain rate increasing yield strength as well as true stress for 0.3 true strain increasing in both steels. The microstructure observations reveal the influence of strain rate on the structure evolution for analyzed steels.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 4; 942-945
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of Mo-Ni Alloys by X-Ray Spectroscopies
    Autorzy:
    Ławniczak-Jabłońska, K.
    Heinonen, M.
    Inoue, J.
    Tohyama, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1924333.pdf
    Data publikacji:
    1993-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.Cf
    78.70.En
    79.60.-i
    Opis:
    Band structure investigations of the random MoNi$\text{}_{4}$ and MoNi$\text{}_{3}$ alloys, performed by emission and photoelectron spectroscopy, is reported. The X-ray emission and X-ray photoelectron spectra allowed to study the occupied valence band states below Fermi level. These techniques gave the full description of changes in the density of valence electron states distribution due to substitution of Mo atoms into the fcc Ni lattice up to 25 at%. The analysis of the emission and photoelectron spectra led to clear distinction between the changes in spectra caused by density of states structure and by additional effects involved in creation of the particular spectra. The experimental data are compared with the density of states calculated using coherent potential approximation and linear muffin-tin orbital methods.
    Źródło:
    Acta Physica Polonica A; 1993, 83, 1; 115-124
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Interrelation of Microstructure and Corrosion Resistance in Biodegradable Magnesium Alloys with Aluminum, Lithium and Rare Earth Additions
    Autorzy:
    Minárik, P.
    Landa, M.
    Lesná, I.
    Zemková, M.
    Jablonská, E.
    Hadzima, B.
    Janeček, M.
    Král, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402061.pdf
    Data publikacji:
    2015-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.-t
    82.45.Bb
    87.85.J-
    43.40.Le
    Opis:
    The influence of equal channel angular pressing and rotary swaging on the microstructure and corrosion resistance was investigated in three magnesium alloys with the addition of aluminum, lithium and rare earth elements - AE21, AE42 and LAE442. The processing resulted in grain refinement in all cases; nevertheless, the effect on the corrosion resistance was ambiguous. A continuous increase of the polarization resistance during the gradual equal channel angular pressing was observed in the AE42 and LAE442 alloys, whereas there was almost no effect in the AE21 alloy. The rotary swaging of AE42 resulted in a decrease of polarization resistance. The increase of polarization resistance in the alloys with the higher concentration of alloying elements was caused by the combined effect of grain refinement and better dispersion of particles in the matrix thanks to shear deformation during equal channel angular pressing. In the AE42 alloy, the increase of the corrosion resistance after equal channel angular pressing was also proven by chemical analysis of the solution and acoustic emission detection. This beneficial effect was not observed when the concentration of alloying elements was lower or when the deformation mode was different from shearing.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 4; 491-496
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of the Local Environment of Mn Ions Implanted in GaSb
    Autorzy:
    Wolska, A.
    Lawniczak-Jablonska, K.
    Klepka, M.
    Barcz, A.
    Hallen, A.
    Arvanitis, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1538865.pdf
    Data publikacji:
    2010-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.70.Dm
    61.72.U-
    61.05.cj
    Opis:
    The first attempts to establish an implantation process leading to formation of ferromagnetic inclusions inside the GaSb matrix are presented. Gallium antimonide containing ferromagnetic MnSb precipitations is considered as a promising material for novel spintronic applications. It is possible to obtain such inclusions during the molecular beam epitaxy (MBE) growth. However, for commercial application it would be also important to find an optimal way of producing this kind of inclusions by Mn ions implantation. In order to achieve this goal, several parameters of implantation and post annealing procedures were tested. The ion energy was kept at 10 keV or 150 keV and four different ion doses were applied, as well as various annealing conditions. The analysis of X-ray absorption spectra allowed to estimate the local atomic order around Mn atoms. Depending on the implantation energy and annealing processes, the manganese oxides or manganese atoms located in a heavily defected GaSb matrix were observed. The performed analysis helped in indicating the main obstacles in formation of MnSb inclusions inside the GaSb matrix by Mn ion implantation.
    Źródło:
    Acta Physica Polonica A; 2010, 117, 2; 286-292
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    X-Ray Photoelectron Spectroscopy and X-Ray Diffraction Studies of Zn$\text{}_{1-x}$Co$\text{}_{x}$S Diluted Magnetic Semiconductor Crystals
    Autorzy:
    Ławniczak-Jabłońska, K.
    Gołacki, Z.
    Paszkowicz, W.
    Iwanowski, R. J.
    Johansson, L.-S.
    Heinonen, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1861485.pdf
    Data publikacji:
    1993-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    79.60.-i
    71.20.Fi
    Opis:
    X-ray photoelectron spectroscopy and powder X-ray diffraction studies of diluted magnetic semiconducting alloys Zn_{1-x}Co_{x}S, in the composition range 0 ≤ x ≤ 0.18, were performed. The analysis of XPS spectra has shown that admixture of Co into ZnS lattice does not affect the shape and position of Zn 2p core level, whereas certain modification of the S 2p peak shape was observed. The detected binding energy of Co indicated similarity between Co-S and Co-O bond structure. Significant contributions of Co 3d^{7} electrons to the valence band density of states were revealed.
    Źródło:
    Acta Physica Polonica A; 1993, 84, 4; 633-636
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    XANES Studies of Mn K and $L_{3,2}$ Edges in the (Ga,Mn)As Layers Modified, by High Temperature Annealing
    Autorzy:
    Wolska, A.
    Lawniczak-Jablonska, K.
    Klepka, M.
    Jakieła, R.
    Demchenko, I.
    Sadowski, J.
    Holub-Krappe, E.
    Persson, A.
    Arvanitis, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1812244.pdf
    Data publikacji:
    2008-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.70.Dm
    75.50.Pp
    Opis:
    $Ga_{1-x}Mn_xAs$ is commonly considered as a promising material for microelectronic applications utilizing the electron spin. One of the ways that allow increasing the Curie temperature above room temperature is to produce second phase inclusions. In this paper $Ga_{1-x}Mn_xAs$ samples containing precipitations of ferromagnetic MnAs are under consideration. We focus on the atomic and electronic structure around the Mn atoms relating to the cluster formation. The changes in the electronic structure of the Mn, Ga and As atoms in the (Ga,Mn)As layers after high temperature annealing were determined by X-ray absorption near edge spectroscopy. The experimental spectra were compared with the predictions of ab initio full multiple scattering theory using the FEFF 8.4 code. The nominal concentration of the Mn atoms in the investigated samples was 6% and 8%. We do not observe changes in the electronic structure of Ga and As introduced by the presence of the Mn atoms. We find, in contrast, considerable changes in the electronic structure around the Mn atoms. Moreover, for the first time it was possible to indicate the preferred interstitial positions of the Mn atoms.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 2; 357-366
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of Third Generation Synchrotron Source to Studies of Non-Crystalline Materials: In-Se Amorphous Films
    Autorzy:
    Burian, A.
    Jabłońska, A.
    Burian, A. M.
    Le Bolloc'h, D.
    Metzger, H.
    Proux, O.
    Hazemann, J. L.
    Mosset, A.
    Raoux, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/2030649.pdf
    Data publikacji:
    2002-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.10.-i
    61.43.Dq
    Opis:
    The local structure of vacuum evaporated In-Se amorphous films, containing 50, 60, and 66 at.% Se, was studied using differential anomalous X-ray scattering and extended X-ray absorption fine structure. Both intensity and absorption spectra were measured in the vicinity of the absorption K-edge of Se. The differential anomalous X-ray scattering data were converted to real space by the inverse Fourier transform yielding the differential radial distribution functions. The obtained results provide evidence for the presence of Se-In spatial correlations for In$\text{}_{50}$Se$\text{}_{50}$ and Se-In and Se-Se correlations for In$\text{}_{40}$Se$\text{}_{60}$ and In$\text{}_{34}$Se$\text{}_{66}$ within the first coordination sphere.
    Źródło:
    Acta Physica Polonica A; 2002, 101, 5; 701-708
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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