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    Wyświetlanie 1-13 z 13
    Tytuł:
    Nanoscale Fracture Morphologies of Soft Magnetic CoFeTaB Amorphous Alloy
    Autorzy:
    Miškuf, J.
    Csach, K.
    Juríková, A.
    Huráková, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1367300.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.43.Dq
    62.25.Mn
    Opis:
    We analyzed the failure characteristics of the bulk metallic glass $Co_{43}Fe_{20}Ta_{5.5}B_{31.5}$ (at.%) deformed by compression and by bending of the ribbons. Under the load the amorphous structure can store high elastic energy. The surface morphology of nanoscale fracture is in accord with the micromechanisms of the failure of the amorphous structure. The fracture surface consists of a smooth mirror cleavage zone and a river pattern zone with nanosized dimples, arranged in lines respecting the periodic corrugation zones, oriented perpendicular to the crack propagation direction. The presence of the failure initiation centers in the ribbon influences the dynamics of crack propagation and also the surface morphology of the fracture.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 96-97
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural Stability of Amorphous Alloy of Modified Finemet Type
    Autorzy:
    Huráková, M.
    Csach, K.
    Juríková, A.
    Miškuf, J.
    Rajňák, M.
    Ďurišin, M.
    Kvačkaj, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1387067.pdf
    Data publikacji:
    2015-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.43.Dq
    62.20.Hg
    62.20.de
    Opis:
    The Finemet type amorphous alloys are well known as high frequency soft magnetic materials. They have good soft magnetic properties which are characterized by low coercive force and high permeability because of the lack of crystalline anisotropy. The structural stability of the amorphous ribbon of Finemet type modified by Mn, Al and Cr prepared by melt-spinning process was studied using differential scanning calorimetry and dynamical mechanical analysis. With increase of the crystalline portion in the sample, the Curie transition is shifted to the higher temperatures. The magnetic relaxation processes at frequencies above 10⁴ Hz were detected by mass magnetic susceptibility measurement.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 2; 564-566
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fragmentation of Co-Fe-Ta-B Soft Magnetic Amorphous Alloy
    Autorzy:
    Miškuf, J.
    Csach, K.
    Juríková, A.
    Huráková, M.
    Tabachnikova, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1387048.pdf
    Data publikacji:
    2015-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.43.Dq
    62.25.Mn
    Opis:
    The main limitation of high-strength Co-based bulk metallic glasses for their application as structural materials is the large brittleness. Spontaneously emerging cracks in the alloy degrade the magnetic properties. We analyzed the failure characteristics of $Co_{43}Fe_{20}Ta_{5.5}B_{31.5}$ bulk soft magnetic metallic glass deformed in the compression at room temperature and the low strain rate. Under loading the amorphous structure stores high elastic energy. During the failure this energy is released and the alloy breaks into small particles or powder exhibiting a fragmentation mode.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 2; 558-560
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Crystallization Process of $Fe_{75}Co_5Zr_{10}B_{10}$ Amorphous Alloy
    Autorzy:
    Sun, Y.
    Zuo, B.
    Wang, D.
    Meng, X.
    Liu, J.
    Wang, L.
    Hua, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399278.pdf
    Data publikacji:
    2013-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.43.Dq
    64.60.My
    Opis:
    $Fe_{75}Co_5Zr_{10}B_{10}$ amorphous alloy prepared by melt-spinning was annealed at various temperatures. The thermal property and microstructures were investigated by differential thermal analysis, X-ray diffraction, and transmission electron microscopy. The crystallization process of $Fe_{75}Co_5Zr_{10}B_{10}$ amorphous alloy is complex. The α-Fe phase precipitates from the amorphous matrix in the initial stage of crystallization. The α-Mn type (χ) phase precipitates at 570°C, but transforms to α-Fe phase and the Laves C14(λ) phase at higher temperature. In the final stage of crystallization, $Fe_3Zr$, $Fe_2Zr$, and unknown phases are observed and the λ-phase disappears. The α-Fe phase preferentially nucleates after annealing at 530C for 10 min and the χ-phase preferentially nucleates after annealing at 600C for 10 min. The nucleation barrier of χ-phase is larger than that of α-Fe phase. The local structure of χ-phase is more similar to amorphous phase.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 4; 685-687
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of Local Structure of $Fe_{84}B_{16}$ Amorphous Alloy by Electron Diffraction
    Autorzy:
    Hrabčáková, V.
    Michalik, Š.
    Borisenko, K.
    Girman, V.
    Nemcová, V.
    Sovák, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1367454.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.05.J-
    61.43.Dq
    61.43.-j
    61.43.Bn
    Opis:
    Local atomic structure in $Fe_{84}B_{16}$ metallic glass, prepared by melt-spinning technique in He atmosphere, was studied by electron diffraction (ED) reduced density function (RDF) analysis. RDF curves were also obtained from X-ray diffraction (XRD) patterns and compared with the data from ED. Atomic reduced density functions, G(r), calculated from ED and XRD patterns showed good agreement. Atomic structure model has been fitted to the experimental ED data using Reverse Monte Carlo (RMC) simulation.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 130-131
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural and Magnetic Studies of the Fe-Co-Zr-Mo-W-B Amorphous Alloy
    Autorzy:
    Kotynia, K.
    Pawlik, P.
    Hasiak, M.
    Pruba, M.
    Pawlik, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030235.pdf
    Data publikacji:
    2017-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.43.Dq
    75.50.Kj
    75.30.Sg
    75.30.Kz
    75.40.-s
    Opis:
    The paper presents a characterization of the phase structure by X-ray diffraction and isothermal magnetic entropy changes for the amorphous Fe₅₈Co₁₀Zr₁₀Mo₅W₂B₁₅ alloy sample in the as-quenched state. An ingot sample was obtained by arc-melting. The ribbon sample was obtained by the melt-spinning technique. The magnetic measurements at various temperatures allowed for the study of the Curie temperature T_{C} and magnetic entropy changes |ΔS_{M}|. In order to determine the Curie temperature T_{C} of amorphous phase, three independent methods were used. Determination of the Curie temperature T_{C} for the amorphous alloys is not a trivial problem, as magnetization does not decreases rapidly around T_{C}. Therefore it is essential issue to establish T_{C} using few complementary methods. X-ray diffraction analysis revealed a fully amorphous structure of the ribbon samples.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 5; 1204-1206
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Magnetic Properties and the Barkhausen Noise of the Hydrogenated Fe-V-B Amorphous Alloy
    Autorzy:
    Ceniga, L.
    Novák, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/2013242.pdf
    Data publikacji:
    2000-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.43.Dq
    75.50.Kj
    75.60.Ej
    Opis:
    As a consequence of the hydrogenation-dehydrogenation process, in the present paper the study of structural changes which could be followed by measuring structure sensitive magnetic properties as the stress induced anisotropy, the coercive force, the demagnetizing factor, and the Barkhausen noise parameters of the as-cast and hydrogenated Fe$\text{}_{80}$V$\text{}_{5}$B$\text{}_{15}$ amorphous alloys is performed.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 3; 611-614
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Magnetic Properties and the Barkhausen Noise of the Annealed Fe-V-B Amorphous Alloy
    Autorzy:
    Ceniga, L.
    Novák, L.
    Zentko, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2013228.pdf
    Data publikacji:
    2000-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.43.Dq
    75.50.Kj
    75.60.Ej
    Opis:
    As a consequence of the annealing process, the study of structural changes which can be followed by measuring structure sensitive magnetic properties as the stress induced anisotropy, the coercive force, the demagnetizing factor, and the Barkhausen noise parameters of the as-cast and annealed Fe$\text{}_{80}$V$\text{}_{5}$B$\text{}_{15}$ amorphous alloys was performed. The structural changes were connected with the temperature range where the Fe$\text{}_{80}$V$\text{}_{5}$B$\text{}_{15}$ amorphous alloy was characterized by the soft magnetic properties.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 3; 575-578
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Plastic Deformation on Devitrification of $Fe_{73.5}Nb_{3}Cu_{1}Si_{13.5}B_{9}$ Amorphous Alloy
    Autorzy:
    Csach, K.
    Miškuf, J.
    Juríková, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1367306.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.43.Dq
    62.20.Hg
    Opis:
    The method of thermogravimetry in external magnetic field was modified using square wave alternate magnetic field for an estimation of the temperature dependence of the magnetization. This method was used for the study of influence of plastic deformation of the amorphous alloy $Fe_{73.5}Nb_{3}Cu_{1}Si_{13.5}B_{9}$ on the structural changes.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 98-99
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of Effect of Annealing the Fe$\text{}_{78}$Si$\text{}_{9}$B$\text{}_{13}$ Amorphous Alloy Using the EELS Method and the Hall Effect
    Autorzy:
    Kołodziej, H. B.
    Jakubczyk, E.
    Mandecki, Z.
    Całusiński, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1929095.pdf
    Data publikacji:
    1993-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.43.Dq
    Opis:
    The effect of structural relaxation on the electronic structure of Fe$\text{}_{78}$Si$\text{}_{9}$B$\text{}_{13}$ metallic glass was investigated by means of the Hall effect, electrical conductivity and EELS methods. The effect of the structural relaxations was observed by four-hour annealing of the samples in argon atmosphere at temperatures 573, 673, 723, 773 K. The most distinct changes in the measured quantities were observed for samples annealed at 773 K. The differences in EELS spectrum, a decrease in the electrical and the Hall resistance are specific to these samples. X-ray diffractometry confirmed that the samples annealed at this temperature show recrystallization.
    Źródło:
    Acta Physica Polonica A; 1993, 83, 3; 327-331
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Ball Milling on the Local Atomic Structure of an Amorphous CoFeSiB Alloy
    Autorzy:
    Bednarcik, J.
    Michalik, S.
    Kollar, P.
    Roth, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1534068.pdf
    Data publikacji:
    2010-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.43.Dq
    61.05.cp
    64.70.dg
    75.30.Kz
    Opis:
    It follows from experimental observations that ball milling induces substantial changes in an amorphous $Co_{70.3}Fe_{4.7}Si_{10}B_{15}$ (at.%) alloy. X-ray diffraction indicates formation of nanocrystalline bcc-(Co,Fe) phase during ball milling. As a consequence crystallization sequence is altered and the total enthalpy of crystallization reduces with the milling time. Furthermore thermomagnetic measurements reveal that specific magnetization and Curie temperature of amorphous phase are influenced by ball milling.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 5; 825-826
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermopower and hardness characterization of structural relaxation and crystallization in FINEMET type amorphous precursor alloy
    Autorzy:
    Bán, K.
    Szabó, A.
    Ipach, R.
    Szabó, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1053037.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.43.Dq
    72.15.Jf
    Opis:
    In this paper, the thermopower (U) and hardness (HV) of FINEMET type glasses are studied during structural relaxation and beyond the crystallization onset. In this multicomponent alloy (Fe_{73.5-x}Si_{13.5}B_{9}Nb_{x}Cu_{1}) both property changes are more complex than that in binary Fe-B glasses. The phenomenon of relaxation and the crystallization onset can be successfully distinguished in both property changes. Simultaneously with the hardness increase, a slope increase in the thermopower versus temperature dependences was observed if crystallization started. The character of both property changes does alter drastically at the beginning of amorphous-nanocrystalline transformation. Similar trends were measured on samples undergoing traditional isothermal and pulse heat treatments.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 702-704
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Crystallisation of Amorphous $Y_{50}Cu_{42}Al_8$ Alloy
    Autorzy:
    Idzikowski, B.
    Śniadecki, Z.
    Mielniczuk, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1810410.pdf
    Data publikacji:
    2009-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.43.Dq
    61.82.Bg
    81.07.Bc
    81.70.Pg
    Opis:
    Amorphous $Y_{50}Cu_{42}Al_8$ ribbon was prepared by melt-spinning technique on the Cu wheel. The crystallisation process was analysed by differential scanning calorimetry and X-ray diffraction. Differential scanning calorimetry curves characterising two crystallisation stages of $Y_{50}Cu_{42}Al_8$ alloy were measured in non-isothermal dynamic mode at different heating rates. Activation energies of both steps of crystallisation process were acquired by the Kissinger method and are equal to 570± 56 and 290±29 kJ/mol for the first and second stage, respectively. By annealing the ribbon at a given temperature for various times the nanocrystalline phase grains of the sizes of about 40 nm in diameter were created. The influence of the annealing temperature on the grain size evolution was also examined.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 1; 147-149
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-13 z 13

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