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    Wyświetlanie 1-7 z 7
    Tytuł:
    Influence of high energy milling time on the Ti-50Ta biomedical alloy structure
    Autorzy:
    Matuła, I.
    Dercz, G.
    Zubko, M.
    Prusik, K.
    Pająk, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1153599.pdf
    Data publikacji:
    2016-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.85.J-
    81.05.Zx
    81.07.Wx
    81.20.Ev
    Opis:
    Nickel-free titanium alloys are a promising research direction in the field of biomedical materials. Current literature reports indicate that there is a possibility of using the Ti-Ta alloys in medicine since these alloys have had satisfactory results as far as biocompatibility, resistance to corrosion and mechanical properties are concerned, which is an important aspect while considering the use of this alloy for long-lasting bone implants. This article presents the results of a high-energy milling process with the use of Ti and Ta powders. The ball-milling process was carried out for various times, including 20, 40, 60, 80, and 100 h. The samples were characterized by X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The research confirmed partial synthesis of the materials during the process of high energy ball milling.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 4; 1033-1036
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural Relaxation and Crystallisation in Fe-Cr-Si-B and Fe-Cu-Cr-Si-B Amorphous Alloys
    Autorzy:
    Stokłosa, Z.
    Rasek, J.
    Kwapuliński, P.
    Haneczok, G.
    Pająk, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/2035500.pdf
    Data publikacji:
    2002-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.-y
    75.75.+a
    Opis:
    Structural relaxation, crystallisation and optimisation processes in soft magnetic amorphous alloys based on iron are examined by applying different experimental techniques: X-ray diffraction analysis, high-resolution electron microscopy, measurements of magnetic and electric properties (permeability, after-effect, resistivity). The presented results are discussed in terms of annealing out of microvoids, formation of a nanocrystalline phase and changes of effective magnetostriction constant.
    Źródło:
    Acta Physica Polonica A; 2002, 102, 2; 273-281
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Positron Annihilation in Polycrystalline Metals Deformed by Uniaxial Tension
    Autorzy:
    Rudzińska, W.
    Pająk, J.
    Szuszkiewicz, M.
    Bujnarowski, G.
    Kluza, A. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2043362.pdf
    Data publikacji:
    2005-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.70.Bj
    Opis:
    Angular distributions of the positron annihilation quanta were measured for polycrystalline samples deformed by uniaxial tension up to different deformation degrees. The S parameter as a function of the W parameter was determined. The data obtained for samples elongated up to different elongation degrees indicate that in the proportionality and limited proportionality regions the changes in the physical properties of samples are governed mainly by generation of vacancies and formation and kinetics of transformations of vacancy clusters occurring first of all on the grains of monocrystallites. In the region of plastic deformations the dominant defects are dislocations and vacancies and their aggregates generated due to the formation and movement of the dislocation of the primary and secondary slip. The positron annihilation data are corroborated by the results of the resistometric and tensometric measurements in the proportionality and limited proportionality regions.
    Źródło:
    Acta Physica Polonica A; 2005, 107, 5; 857-863
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Positron Annihilation in Metals Defected by Action of the Tensile Force
    Autorzy:
    Rudzińska, W.
    Pająk, J.
    Szuszkiewicz, M.
    Bujnarowski, G.
    Kluza, A. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047160.pdf
    Data publikacji:
    2006-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.70.Bj
    Opis:
    Results of experimental investigations of uniaxially elongated mono- and polycrystalline samples of several metals (Fe, Ta, Pd, Ag, and Au), performed using the positron annihilation methods, are reviewed. The dependences of the S-parameters and positron lifetimes on the relative elongation of the samples were presented. The data obtained for polycrystalline samples indicate that in the proportionality and limited proportionality regions the changes in the physical properties are governed mainly by generation of vacancies and by kinetics of formation and transformations of vacancy clusters occurring first of all on the grain boundaries of monocrystallites. In the region of plastic deformations the dominant defects are dislocations and vacancies and their aggregates generated due to the formation and movement of the dislocations of the primary and secondary slip. In the case of monocrystalline samples it was found that the dynamics of the dislocations and vacancy generation during the sliding of some crystallographic planes depends on the crystallographic direction.
    Źródło:
    Acta Physica Polonica A; 2006, 110, 5; 691-699
    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:
    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.
    Powiązania:
    https://bibliotekanauki.pl/articles/1811608.pdf
    Data publikacji:
    2008-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.05.Qr
    61.05.C-
    61.05.J-
    81.07.Bc
    81.20.Wk
    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.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 6; 1623-1629
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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