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    Wyświetlanie 1-6 z 6
    Tytuł:
    Defect structure of Fe-Al and Fe-Al-X (X = Ni; Cu; Cr) metallic powders obtained by the self-decomposition method
    Autorzy:
    Hanc, A.
    Frąckowiak, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/147208.pdf
    Data publikacji:
    2004
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    iron aluminides
    defects
    points defects
    Mössbauer spectroscopy
    Fe-Al
    Opis:
    In the present work, the Fe-Al-X (X = Cu; Ni; Cr) metallic powders produced by the self-decomposition method of the Fe-Al doped alloys were examined by Mössbauer spectroscopy. The concentration of the Fe vacancies and the Fe atoms substituting Al (Fe-AS) was determined from the intensities of the sub-spectra in the Mössbauer analysis connected with distinct Fe environments. The results have shown that nickel and copper cause an increase of vacancy concentrations in comparison with the values found for Fe-Al metallic powders, whereas chromium decreases vacancy concentrations causing a significant increase of anti-site atoms Fe-AS concentration.
    Źródło:
    Nukleonika; 2004, 49,suppl.3; 7-11
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of heat treatment on point defect concentration in Fe-Al and Fe-Al-Cr systems
    Autorzy:
    Kansy, J.
    Hanc, A.
    Giebel, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/146336.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    positron annihilation
    Fe-Al
    Fe-Al-Cr
    point defects
    Opis:
    FeAl alloys of nominal Al content 28, 38 and 45 at.% and Fe28Al5Cr with minor alloying elements added to improve their application properties are studied by positron annihilation lifetime analysis. The lifetime spectra of samples FeXAl with X greater-than or equal to 38 (both quenched and cooled with furnace) are described by a single lifetime component related to the saturated positron trapping by quenched-in vacancies of concentration much higher than 100 ppm. A very strong dependence of retained vacancy concentration on the rate of cooling is shown for Fe28Al and Fe28Al5Cr alloys. After quenching, the concentration is of the order of 10.4 whereas in samples slowly cooled it is reduced to 10.5. The chromium addition to Fe28Al5Cr dismisses the vacancies concentration in comparison to the concentration in Fe28Al after the same heat treatment.
    Źródło:
    Nukleonika; 2010, 55, 1; 21-25
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Point defects in the B2 - phase region of the Fe-Al system studied by Mössbauer spectroscopy and X-ray diffraction
    Autorzy:
    Hanc-Kuczkowska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/147904.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    iron aluminides
    Mössbauer spectroscopy
    point defects
    X-ray diffraction
    Opis:
    In this work Mössbauer spectroscopy and X-ray powder diffraction was used to study of point defects formation in intermetallic phases of the B2 structure of the Fe-Al system as a function of Al concentration. The results are compared with the concentrations of point defects determined from positron annihilation data. The values of the 57Fe isomer shift and quadrupole splitting for the components describing the point defects in the local environment of a Mössbauer nuclide are presented. The concentration of the Fe vacancies and Fe atoms substituting Al (i.e. anti-site atom, Fe-AS) are determined. The results show that an increase in Al content causes an increase in vacancy and Fe-AS concentrations.
    Źródło:
    Nukleonika; 2013, 58, 1; 123-126
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mössbauer temperature study of the Fe80Nb6B14 amorphous alloy
    Autorzy:
    Frąckowiak, J.
    Tomczyk, A.
    Hanc, A.
    Haneczok, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/148205.pdf
    Data publikacji:
    2007
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    amorphous alloys
    magnetic properties
    structural relaxation
    Opis:
    Temperature studies in the range 300 800 K of amorphous Fe80Nb6B14 alloy using Mössbauer spectroscopy are presented. It is shown that at a temperature close to 700 K iron clusters with non-collinear magnetic structure are formed. The observed magnetic permeability enhancement effect in the annealed at elevated temperatures alloy, which takes place in amorphous phase, is due to the strong ferromagnetic exchange between Fe clusters via the amorphous matrix and reduction of internal stresses.
    Źródło:
    Nukleonika; 2007, 52, supl. 1; 43-46
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Change of the defect structure in FeAl alloy as a result of its aging at ambient temperature
    Autorzy:
    Kansy, J.
    Hanc-Kuczkowska, A.
    Giebel, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/148012.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    PALS
    FeAl
    LT10
    defect structure
    Opis:
    Positron annihilation lifetime spectroscopy (PALS) was used to study the defect structure of stoichiometric FeAl samples after their slow cooling or quenching from the temperatures of 1000 and 540 centigrade. The high value of positron lifetime in the quenched-in defects suggests that they are mainly of di-vacancy type. After long storage at ambient temperature, the concentration of defects in the samples strongly decreases and mono-vacancies predominate. Annealing at 540 centigrade generates an additional amount of defects may be ascribed to the formation of FeAl2 phase in the FeAl matrix.
    Źródło:
    Nukleonika; 2013, 58, 1; 221-224
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ordering process in Fe-Al28Cr5 alloys studied by Mössbauer spectroscopy
    Autorzy:
    Hanc-Kuczkowska, A.
    Kansy, J.
    Deniszczyk, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/147348.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    Fe-Al28Cr5 alloys
    formation of D03 phases
    Mössbauer spectroscopy
    Opis:
    In the paper, studies of ternary Fe-Al28Cr5 alloys directed to characterization of mechanisms of the formation of ordered intermetallic phases influencing the possibilities of their practical application are shown. Also, a role of chromium as a modifier in kinetics of the formation of ordered phases is determined. Among the research method used, Mössbauer spectroscopy for the determination of hyperfine structure parameters was adopted. These parameters, sensitive to changes in spin and charge electron densities in the nearest neighbourhood of a Mössbauer isotope nucleus, caused by specific configurations of atoms, are directly connected with the degree of ordering of a compound. Spectral analysis has been carried out using the authors' software developed based on a theoretical model relating the shape of a Mössbauer spectrum to the sample microstructure. It has been shown that Mössbauer spectroscopy enables quantitative evaluation of the degree of ordering of phases occurring in samples characterized by large graining, in the case of which it is not possible to determine the long-range order parameter by X-ray diffraction.
    Źródło:
    Nukleonika; 2013, 58, 1; 67-71
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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