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    Wyświetlanie 1-8 z 8
    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:
    Hyperfine Interaction Parameters in $Fe_{28}Al_{72}:$ $\text{}^{57}Fe$ Mössbauer Spectroscopy and Ab Initio Study
    Autorzy:
    Hanc, A.
    Deniszczyk, J.
    Kansy, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1427489.pdf
    Data publikacji:
    2012-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.80.+y
    61.05.Qr
    71.20.-b
    Opis:
    The paper discusses a theoretical model that associates the shape of the Mössbauer spectrum with the configuration of atoms in local surroundings of the Mössbauer nuclide. Using the model we analyse the Mössbauer spectra of $Fe_{72}Al_{28}$ alloys after various heat treatments. Basing on the model calculations the hyperfine structure parameters describing an effect of an Al atom in the first and the second coordination shell of $\text{}^{57}Fe$ atom are evaluated. Using these parameters the values of hyperfine magnetic field and isomers shift for the atomic configurations present in stoichiometric $Fe_3Al$ are estimated and compared with the results of ab initio calculations.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 5-6; 1154-1155
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Heat Treatment on Ordering Process in $Fe_{72}Al_{28}$ Alloy Studied by Mössbauer Spectroscopy
    Autorzy:
    Kansy, J.
    Hanc, A.
    Giebel, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1506590.pdf
    Data publikacji:
    2011-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Bb
    81.30.Hd
    76.80.+y
    Opis:
    The paper discusses a theoretical model that associates the shape of Mössbauer spectrum with the configuration of atoms in local surroundings of the Mössbauer nuclide. The model has been implemented to a computer program which was used to analyse the Mössbauer spectra of $Fe_{72}Al_{28}$ alloys after various heat treatments. Basing on the determined configuration of atoms, the long range ordering parameter was estimated.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 1; 44-47
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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:
    A Study of Point Defects in the B2-Phase Region of the Fe-Al System by Mössbauer Spectroscopy
    Autorzy:
    Hanc, A.
    Kansy, J.
    Dercz, G.
    Pająk, L.
    Oleszak, D.
    Mrzigod, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1811589.pdf
    Data publikacji:
    2008-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Bb
    61.72.J-
    76.80.+y
    Opis:
    In this work, we employed the Mössbauer spectroscopy and X-ray powder diffraction in a study of point defect 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 defect determined from positron annihilation data. In the Mössbauer effect, two types of samples are investigated: Fe-Al alloys with few additives obtained by induction melting and Al-rich metallic powders produced by the self-decomposition method and intensive grinding of high energy in the electro-magneto-mechanical mill. We present the values of the $\text{}^{57}Fe$ isomer shift and quadrupole splitting for the components describing the point defect in the local environment of a Mössbauer nuclide. The concentration of the Fe vacancies and Fe atoms substituting Al (Fe-AS) are determined. The results showed that an increase in Al content causes an increase in vacancy and Fe-AS concentration.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 6; 1555-1562
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural Relaxation in $Fe_{78}Nb_{2}B_{20}$ Amorphous Alloy Studied by Mössbauer Spectroscopy
    Autorzy:
    Kansy, J.
    Hanc, A.
    Rasek, J.
    Haneczok, G.
    Pająk, L.
    Stokłosa, Z.
    Kwapuliński, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1506588.pdf
    Data publikacji:
    2011-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.75.+a
    76.80.+y
    Opis:
    It was shown that soft magnetic properties of $Fe_{78}Nb_{2}B_{20}$ amorphous alloy can be significantly improved by applying 1-h annealing at temperature 623 K (permeability increases even about 8 times). The Mössbauer Spectroscopy technique indicated that the optimized microstructure (corresponding to the maximum magnetic permeability) is free of iron nanograins and should be attributed to annealing out of free volume and a reduction of internal stresses i.e. to the relaxed amorphous phase.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 1; 41-43
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    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 1-8 z 8

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