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    Wyświetlanie 1-4 z 4
    Tytuł:
    Structure and properties of NiTi shape memory alloy after cold rolling in martensitic state
    Autorzy:
    Świec, P.
    Zubko, M.
    Lekston, Z.
    Stróż, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1113263.pdf
    Data publikacji:
    2016-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.30.Kf
    81.40.Ef
    62.20.fg
    Opis:
    Due to unique features, like shape memory effects and superelasticity, NiTi alloys with nearly equiatomic composition are used in various branches of industry. Application of severe plastic deformation can drastically change properties of the materials. In the present paper the Ni_{50.4}Ti_{49.6} alloy after cold rolling in the martensitic state and further annealed is studied. Phase transformations were studied using X-ray diffraction and differential scanning calorimetry measurements. Microstructure was examined using transmission electron microscopy and electron backscattering diffraction methods. Mechanical properties of obtained alloys has been studied using Vickers microhardness tests. Based on the performed measurements it can be seen that in studied alloys two steps B2 ↔ R ↔ B19' phase transitions occurred. Performed plastic deformation influences course of phase transitions and phases composition. Due to the reduction of grain size microhardness of the studied material is increasing with increase of deformation degree.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 4; 1081-1084
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Monitoring of Heat Treatment Processes by High Energy Synchrotron Radiation
    Autorzy:
    Klemradt, U.
    Rieger, T.
    Herrmann, K.
    Carmele, D.
    Meyer, S.
    Lippmann, T.
    Stark, A.
    Bleck, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1490740.pdf
    Data publikacji:
    2012-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.05.cp
    81.05.Bx
    81.30.Kf
    81.40.Ef
    Opis:
    Advanced engineering materials are frequently based on multiphase microstructures, where the decisive step is the heat treatment adjusting the desired microstructure. A typical example are transformation-induced plasticity assisted steels, where the steel grades depend on the phase composition and the deformation-induced transformation of retained austenite into martensite. Usually methods for microstructural characterization are only applied after completion of the heat treatment process and comprise typically microscopy and X-ray analysis with laboratory tubes. Both methods can suffer from artefacts and probe a relatively small surface or volume, respectively. However, in the last decade synchrotron facilities have become available that offer very hard X-rays, which open up new possibilities for the observation of heat treatment processes owing to the unique combination of extremely high intensities with large penetration depths (mm scale). Sophisticated sample environments allow for complex in situ experiments, currently with a time resolution on the order of seconds. Only recently a commercial dilatometer of type Bähr Dil805AD has become available at the HARWI-2 beamline at the HASYLAB. This experimental setup was used for the in situ investigation of the quenching and partitioning process in transformation-induced plasticity steels. The experiments were performed in transmission at a wavelength of 0.0124 nm. The Debye-Scherrer rings were observed arising from statistical grain distributions characteristic for each microstructure. The time-resolved measurements allow conclusions about the phases present in the sample, their lattice parameters, texture and grain size.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 1; 39-43
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Martensitic Transformation in Co-Based Ferromagnetic Shape Memory Alloy
    Autorzy:
    Kopeček, J.
    Yokaichiya, F.
    Laufek, F.
    Jarošová, M.
    Jurek, K.
    Drahokoupil, J.
    Sedláková-Ignácová, S.
    Molnár, P.
    Heczko, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1418445.pdf
    Data publikacji:
    2012-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.40.Kc
    61.05.fm
    81.30.Kf
    81.40.Ef
    Opis:
    The $Co_{38}Ni_{33}Al_{29}$ alloy in both powder and bulk state was investigated in the presented study using neutron diffraction on E9 high resolution powder diffractometer at HZB (BER II). The reverse martensitic phase transformation from the tetragonal martensitic phase into the cubic austenitic phase was observed with the phase coexistence within the temperatures from 183 K to 133 K. The fcc cobalt solid solution particles distributed in the transforming matrix remained in the same state through the whole temperature range. The obtained results agree with magnetization measurements on the same annealed sample. The powder data are compared with experiments on bulk sample, although there was a texture present. The obtained results provide further information about the phase transition process in this important class of ferromagnetic shape memory alloys.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 3; 475-477
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Evolution of Microstructure for Ductile Iron Treated under Different Thermal Cycles Using Electrolytic Plasma Treatment
    Autorzy:
    Ayday, A.
    Durman, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1195233.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.35.bd
    52.50.-b
    81.40.Cd
    81.40.Ef
    81.30.Kf
    Opis:
    The effects of the thermal cycles on the microstructures and properties of ductile iron modified by electrolytic plasma treatment were investigated. Microstructure changes occurring in the modified surface were characterized with scanning electron microscopy, X-ray diffractometry techniques. Martensitic structure evolved in the heat affected zone and ledeburite structure was produced in the molten zone of the ductile iron. Microhardness of the treated specimens improved considerably as compared to the original sample. X-ray diffraction clearly revealed the formation of a martensite phases in the modified zone.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 577-578
    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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