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    Wyświetlanie 1-4 z 4
    Tytuł:
    Formation and Structure of Nanocrystalline Al-Mm-Ni-Cu Alloys
    Autorzy:
    Latuch, J.
    Krasnowski, M.
    Ciesielska, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/2035467.pdf
    Data publikacji:
    2002-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.43.Dq
    81.05.Kf
    81.70.Pg
    Opis:
    This paper reports the results of a short investigation on the effect of Cu additions upon the nanocrystallization behaviour of an Al-Mm-Ni alloy. 2 at.%Cu added to a base alloy of Al$\text{}_{85}$Mm$\text{}_{10}$Ni$\text{}_{5}$ alloy by substitution for Mm (mischmetal). The control of cooling rate did not cause the formation of nanocrystals of fcc-Al phase. The nanocrystalline structure fcc-Al + amorphous phase in quarternary alloy was obtained by isothermal annealing and continuous heating method, but the last technique is more effective. The volume fraction, lattice parameter, and size of Al-phase were calculated.
    Źródło:
    Acta Physica Polonica A; 2002, 102, 2; 175-179
    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
    Tytuł:
    Activation Energies of Crystallization in Amorphous $RMn_{4.5}Ge_{4.5}Fe_{1.5}Al_{1.5}$ (R = La, Y, Dy) Alloys
    Autorzy:
    Śniadecki, Z.
    Rößler, U.
    Idzikowski, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1810618.pdf
    Data publikacji:
    2009-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.43.Dq
    61.82.Bg
    75.50.Kj
    81.70.Pg
    Opis:
    The effective activation energies, characteristic crystallization temperatures and enthalpies of amorphous $RMn_{4.5}Ge_{4.5}Fe_{1.5}Al_{1.5}$ (R = Y, La, Dy) alloys produced using melt-spinning technique were investigated by differential scanning calorimetry. X-ray diffraction measurements were performed for as-quenched and annealed samples. The crystalline structure of annealed $YMn_{4.5}Ge_{4.5}Fe_{1.5}Al_{1.5}$ and $DyMn_{4.5}Ge_{4.5}Fe_{1.5}Al_{1.5}$ alloys was determined as orthorhombic $TbFe_6Sn_6$-type with Cmcm (63) space group. The alloy with Y appears as a more useful non-magnetic analogue for $DyMn_{4.5}Ge_{4.5}Fe_{1.5}Al_{1.5}$ than the La-based alloy. The differential scanning calorimetry curves for Dy- and Y-based alloys also exhibit similar thermal behavior. The effective activation energies $E_a$ were determined using the Kissinger approach and high values up to 778±74 kJ/mol for La-based sample were established. The comparison of Y-, La-, and Dy-based alloys suggests improvement of thermal stability with the increase in rare-earth element atomic radius in the glassy $RMn_{4.5}Ge_{4.5}Fe_{1.5}Al_{1.5}$ systems.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 1; 409-412
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nanocrystallisation of Soft Magnetic Fe-Co-Zr-Cu-B Alloys
    Autorzy:
    Wlazłowska, A.
    Ferenc, J.
    Latuch, J.
    Kulik, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2035520.pdf
    Data publikacji:
    2002-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.43.Dq
    75.50.Bb
    75.50.Kj
    75.60.Ej
    81.05.Kf
    81.10.Jt
    81.70.Ex
    81.70.Pg
    Opis:
    In the present study, Fe$\text{}_{41}$Co$\text{}_{41}$B$\text{}_{10}$Zr$\text{}_{7}$Cu$\text{}_{1}$ alloy has been investigated in order to evaluate its thermal stability and structure after heat treatment, as well as the impact of heat treatment on magnetic properties. X-ray diffractometry, differential scanning calorimetry, chemical composition microanalysis, transmission electron microscopy, and magnetic hysteresis loop measurement techniques were employed. The crystallisation temperature of the as-quenched alloy is 490ºC (continuous heating at 5ºC/min). The melt-spun ribbon having 27μm in thickness was annealed for 1 hour at temperatures from 400 to 700ºC. The alloy after treatment at about 550ºC underwent primary crystallisation, with the average size of crystals under 20 nm. This specimen shows the coercive field of 38 A/m, as compared to about 160 A/m reported for a similar alloy (Fe$\text{}_{44}$Co$\text{}_{44}$B$\text{}_{4}$Zr$\text{}_{7}$Cu$\text{}_{1}$) with a similar structure, annealed at 600ºC.
    Źródło:
    Acta Physica Polonica A; 2002, 102, 2; 323-328
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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