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    Wyświetlanie 1-53 z 53
    Tytuł:
    Combined Atom Probe Tomography and TEM Investigations of CoCrFeNi, CoCrFeNi-Pd_x (x=0.5, 1.0, 1.5) and CoCrFeNi-Sn
    Autorzy:
    Cornide, J.
    Calvo-Dahlborg, M.
    Chambreland, S.
    Asensio Dominguez, L.
    Leong, Z.
    Dahlborg, U.
    Cunliffe, A.
    Goodall, R.
    Todd, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402078.pdf
    Data publikacji:
    2015-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.66.Dk
    Opis:
    The structure of a family of high entropy alloys based on the composition CoCrFeNi, to which Pd and Sn have been added, is presented. The results stem from combined investigations by atom probe tomography as well as by scanning and transmission electron microscopy on samples produced by arc melting. Although CoCrFeNi is of fcc structure, the sample is not homogeneous on atomic scale. The addition of Pd as a fifth element retains the fcc lattice with the indication of the coexistence of at least two additional phases. The addition of Sn changes the general structure considerably.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 4; 557-560
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An Evaluation of Homogeneity and Heterogeneity in Metals Processed by High-Pressure Torsion
    Autorzy:
    Figueiredo, R.
    Kawasaki, M.
    Langdon, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1418397.pdf
    Data publikacji:
    2012-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.66.Bi
    61.66.Dk
    Opis:
    Processing through the use of high-pressure torsion is attracting much attention at the present time because of the potential for achieving exceptional grain refinement. In principle, it appears that the thin disks used for high-pressure torsion processing should exhibit significant heterogeneity in the as-processed condition. However, experiments show that the development of homogeneity or heterogeneity is dependent upon the crystalline structure of the material. For high-purity aluminum the as-processed microstructure is very homogeneous after five or more revolutions of torsional straining but for the magnesium AZ31 alloy there is a considerable degree of heterogeneity in the as-processed disks.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 3; 425-429
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tsai-Type Quasicrystal and Its Approximant in Au-Al-Tm Alloys
    Autorzy:
    Tanaka, K.
    Tanaka, Y.
    Ishimasa, T.
    Nakayama, M.
    Matsukawa, S.
    Deguchi, K.
    Sato, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1373678.pdf
    Data publikacji:
    2014-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.66.Dk
    61.44.Br
    Opis:
    A P-type icosahedral quasicrystal with a six-dimensional lattice parameter $a_{6D}$ = 7.411 Å is formed as an equilibrium phase in Au-Al-Tm alloy, of which composition was analyzed to be $Au_{46}Al_{38}Tm_{16}$ by electron probe microanalysis. This quasicrystal is observed as a predominant phase in both as-cast and $Au_{49}Al_{34}Tm_{17}$ alloys annealed at 910°C, and as one of main phases in the alloy slowly cooled from 1020°C. A 1/1 approximant, $Au_{48}Al_{38}Tm_{14}$, is also formed near the composition of the quasicrystal. This is a body-centered cubic structure (space group: Im3̅) with a lattice parameter a = 14.458 Å that is an isostructure to the recently reported 1/1 Tsai-type approximant in Au-Al-Yb. This approximant is characterized by disorderly arranged four Au-Al atoms centered at the Tsai-type cluster, presence of atoms at 8c site, and chemical ordering of Au and Al at sites forming a partial triacontahedron.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 2; 603-607
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Random Microscopic Model of Quaternary Alloys
    Autorzy:
    Konior, J.
    Łażewski, J.
    Kisiel, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1963389.pdf
    Data publikacji:
    1997-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.72.Vv
    61.66.Dk
    Opis:
    A random model of microscopic structure of zinc-blende type A$\text{}_{1-x}$B$\text{}_{x}$C$\text{}_{1-y}$D$\text{}_{y}$ quaternary alloys, based entirely on the elastic bond-stretching and bond-bending forces of two-element components AC, AD, BC, and BD, was constructed. The model was applied to Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te$\text{}_{1-y}$Se$\text{}_{y}$ quaternary alloys and the calculated nearest-neighbor distances were compared with the experimental data. Additionally, a possibility of particle exchange (within each sublattice) was included into the model and a possibility of studying the preferential coordination was discussed.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 4; 815-818
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Crystal perfection studies of single crystal superalloy turbine blades by X-ray diffraction methods
    Autorzy:
    Gancarczyk, K.
    Albrecht, R.
    Bogdanowicz, W.
    Sieniawski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1112679.pdf
    Data publikacji:
    2016-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.66.Dk
    61.05.cp
    Opis:
    In the paper the crystal structure of single crystal CMSX-4 blade casts, applied in high pressure turbine of aircraft engines was analyzed. The longitudinal section of blade, cast at withdrawal rate of 3 mm/min was used as a sample. During the conducted research, following X-ray diffraction methods were applied: EFG Ω-scan, Auleytner X-ray topography and analysis of diffraction reflex profile ("rocking curve"). The authors determined crystal orientation in entire blade casts on the basis of set criterion concerning values of angle α - deviation of [001] direction from the direction of cast withdrawal. Conclusions concerning the crystal structure quality of the blade were drawn based on results from three different research methods. Local changes in crystal orientation on the surface of blade cast, also areas with significant structure defect degree and the presence of internal stresses were characterized.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 4; 1088-1090
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    In Situ Neutron Diffraction Characterization of Phases in Co-Re-Based Alloys at High Temperatures
    Autorzy:
    Strunz, P.
    Mukherji, D.
    Gilles, R.
    Gasser, U.
    Beran, P.
    Farkas, G.
    Hofmann, M.
    Karge, L.
    Rösler, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402124.pdf
    Data publikacji:
    2015-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.05.fg
    61.66.Dk
    Opis:
    Co-Re-based alloys strengthened by carbides are promising candidates for new high-temperature alloys for gas turbine applications. The high temperature microstructure and its stability are of utmost importance, e.g. due to strengthening-phase selection. Neutron scattering, providing in situ information at high temperatures, was extensively used in the past for the Co-Re alloys research. The paper focuses on TaC strengthened alloy, particularly on the stability TaC precipitates which were previously shown not to dissolve up to at least 1300°C. Small-angle neutron scattering shows that its finer morphological variant - most suitable for high temperature strengthening - coarsened even at relatively low temperature of 1000°C. This coarsening is faster at higher temperatures and the mean size exceeded 1000 Å (i.e. the size - detection limit of the used facility) after 4 h hold at 1200°C.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 4; 684-688
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural Properties of Cd$\text{}_{1-x}$Mg$\text{}_{x}$Te and Cd$\text{}_{1-x-y}$Mg$\text{}_{x}$Mn$\text{}_{y}$Te Crystals
    Autorzy:
    Miotkowska, S.
    Dynowska, E.
    Miotkowski, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1931663.pdf
    Data publikacji:
    1994-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.10.Fq
    61.66.Dk
    Opis:
    Electron probe microanalysis and X-ray diffraction studies have been performed on samples of ternary Cd$\text{}_{1-x}$Mg$\text{}_{x}$Te (0.05 ≤ x ≤ 0.09) and quaternary Cd$\text{}_{1-x-y}$Mg$\text{}_{x}$Mn$\text{}_{y}$Te (0.025 ≤ x ≤ 0.4; 0.025 ≤ y ≤ 0.7) alloys. The investigated samples were cut from 24 different ingots grown by Bridgman method. Microprobe examinations have revealed significant differences between actual and nominal content of Mg along the longitudinal direction for both ternary and quaternary ingots. In contrast to Mg, for most Cd$\text{}_{1-x-y}$Mg$\text{}_{x}$Mn$\text{}_{y}$Te samples the actual Mn content was within ±5% of nominal content. The lattice constants have been determined by X-ray powder diffraction method. Whereas Cd$\text{}_{1-x-y}$Mg$\text{}_{x}$Mn$\text{}_{y}$Te samples exhibit only zinc blende crystal structure for the entire region of x and y investigated, the Cd$\text{}_{1-x}$Mg$\text{}_{x}$Te alloy has two different structures depending on Mg content; a zinc blende structure below x = 0.5 and a wurtzite structure above it. In both alloys the lattice constant decreases with increasing Mg content.
    Źródło:
    Acta Physica Polonica A; 1994, 86, 4; 605-611
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characterization of precipitates in aluminium alloy 6013 after cold-rolling and annealing
    Autorzy:
    Bieda, M.
    Jarzębska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1058123.pdf
    Data publikacji:
    2016-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.66.Dk
    68.37.Lp
    Opis:
    The aim of the present work was to observe changes in precipitations during annealing after cold-rolling. Series of the samples from cold-rolled AA6013 were prepared and compared to undeformed samples. The samples were annealed at the temperatures equal to 260, 490°C for undeformed state and at 280, 360, and 530°C for cold-rolled state. For investigation thin foils were prepared. Chemical composition and crystal structure of precipitates was analysed and described using transmission electron microscopy imaging, X-ray energy-dispersive spectroscopy and selected-area diffraction techniques. The researches indicated that low annealing temperatures caused dissolution of metastable β and Q phases. With increasing temperature there also occurred growth of Q phase. At highest annealing temperatures there were noticed precipitations of β phase again. Microstructural observation also revealed an impact of those particles on recrystallization processes.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 4; 988-990
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanical Characterization of CoCrMo Alloys Consisting of Different Palladium Ratios Produced by Investment Casting Method
    Autorzy:
    Sahin, O.
    Uzunoglu, S.
    Sahin, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401950.pdf
    Data publikacji:
    2015-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    62.20.-x
    61.66.Dk
    Opis:
    CoCrMo alloys are one of the most commonly used materials for hip arthroplasty, knee and dental because of its mechanical properties, corrosion resistance, wear resistance and biocompatibility. In this study, CoCrMo alloys consisting of 1.68 to 4.33%Pd are produced by investment casting process under argon atmosphere. The microstructures and mechanical properties of CoCrMo alloy were studied using X-ray diffraction, optical microscopy, scanning electron microscopy, Knoop indentation hardness tests, focusing on the influences on the different palladium additives. The measured microhardness values of CoCrMo alloys having different palladium ratio are seen to be load-dependent. The observed load dependence was rationalized using the Hays-Kendall model and it was found that the resultant load-independent hardness decreases with increase of palladium ratios. As a results, microhardness decreases with increase of palladium amount.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 2B; B-149-B-151
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Properties of Biodegradable Alloys Usable for Medical Purposes
    Autorzy:
    Kubásek, J.
    Vojtěch, D.
    Čapek, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1418513.pdf
    Data publikacji:
    2012-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.66.Dk
    64.70.kd
    Opis:
    Magnesium alloys are promising materials for production of biodegradable implants that may be used for fixation of fractured bones. Magnesium itself is an essential element that plays important roles in many biological processes. However, some common alloying elements of magnesium alloys such as aluminium or copper may cause health problems to the organism. A major problem is the high corrosion rate of magnesium and its alloys in physiological environment that contains chloride anions. Currently, the research focuses on alloys doped by rare-earth elements and zinc. All these elements affect corrosion resistance and mechanical properties of magnesium alloys. This work was dealing with the study of Mg-Gd binary alloy and Mg-Gd-Y, Mg-Gd-Zn ternary alloys that were prepared from pure metals by melting in induction furnace. Various alloy compositions were tested. Corrosion behaviours in 9 M NaCl saline environments (exposure tests, potentiodynamic measurements) were studied on alloys in the cast state. Good corrosion resistance and uniform corrosion were observed in the case of binary Mg-Gd alloy. The influence of the addition of Y or Zn to the Mg-Gd system is discussed.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 3; 520-523
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Crystal Structure and Magnetic Properties of $Mn_{1-x}Gd_{x}Se$ Solid Solutions
    Autorzy:
    Aplesnin, S.
    Galyas, A.
    Demidenko, O.
    Makovetskii, G.
    Panasevich, A.
    Yanushkevich, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1385679.pdf
    Data publikacji:
    2015-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.66.Dk
    75.50.Ee
    Opis:
    The synthesis of polycrystalline $Mn_{1-x}Gd_{x}Se$ solid solutions is carried out by solid state reaction method followed by quenching from the temperature of 1370 K. The X-ray diffraction studies realized at 300 K revealed that the structure of the single phase samples in the 0 < x < 0.15 concentration range is identified on base a face centered cubic crystal cell of Fm3m space group. The heating of the solid solutions to 900 K does not affect on the magnetic susceptibility as the dependences is identical to the measurements in the "heating-cooling" regime. Comparing the research results of magnetic properties of the $Mn_{1-x}Gd_{x}Se$ solid solutions with those of $Mn_{1-x}Gd_{x}S$ solid solutions, we can conclude that substitution of manganese ions by gadolinium in manganese selenide lead to more changes in the basic magnetic characteristics than in manganese sulfide.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 2; 371-373
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Pd Addition of CoCrMo Biomedical Alloys on the Microhardness Behaviour
    Autorzy:
    Sahin, O.
    Uzunoglu, S.
    Sahin, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401948.pdf
    Data publikacji:
    2015-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.66.Dk
    62.20.-x
    Opis:
    CoCrMo alloys are often used as the material for metal artificial joint because of their high corrosion resistance and mechanical properties. In this study CoCrMo alloys having different palladium amount of produced by investment casting method. Scanning electron microscopy, X-ray diffraction method and indentation tests were used to examine the mechanical properties of the alloys. Indentation experiments were carried out using Vickers indenter that the loads range from 0.245 to 9.8 N. The alloys exhibit significant load-dependence (i.e., indentation size effect). Meyer's law, proportional specimen resistance model, and Hays-Kendall model were used to analyze the load dependence of the hardness. As a results for load-independent determination of the CoCrMo alloys, the Hays-Kendall model is found to be more effective than the proportional specimen resistance model and microhardness values decreases with increase of the Pd content.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 2B; B-145-B-148
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure and Properties of Fe-Ni-Al-Si Alloys Produced by Powder Metallurgy
    Autorzy:
    Novák, P.
    Mejzlíková, L.
    Hošek, V.
    Martínek, M.
    Marek, I.
    Michalcová, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1418514.pdf
    Data publikacji:
    2012-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.66.Dk
    62.20.Qp
    Opis:
    Reactive sintering powder metallurgy is a simple alternative to conventional melting and powder metallurgy processes. During this process, pressed powder mixture of pure metals or other precursors is transformed into bulk intermediary phases by thermally activated in situ reaction. This process was previously tested on Fe-Al and Fe-Al-Si alloys. Positive effect of silicon on the reactive sintering behaviour was determined, leading to the development of novel carbon-free high-silicon FeAl20Si20 alloy (given in wt%). In this work, the effect of nickel on the pressureless reactive sintering of Fe-Al-Si pressed powder mixtures was studied. To explain the nickel influence, differential thermal analysis was utilized. Microstructure, phase composition and porosity of the FeAl20Si20Nix (x = 0, 5, 10, 20 wt%) alloys was described. Hardness, wear resistance, high-temperature oxidation resistance and thermal stability were evaluated as functions of nickel content. Results showed that porosity decreases with growing nickel content down to less than 3 vol.%. Oxidation rate of these alloys is more than 10 times lower than that of original FeAl20Si20 alloy. Thermal stability and abrasive wear resistance of these alloys is also superior to Fe-Al and Fe-Al-Si materials.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 3; 524-527
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Solubility Limit of Ni in Cd$\text{}_{1-x}$Ni$\text{}_{x}$Te Crystals
    Autorzy:
    Miotkowska, S.
    Miotkowski, I.
    Dynowska, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1931714.pdf
    Data publikacji:
    1994-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.10.Fq
    61.66.Dk
    Opis:
    The Cd$\text{}_{1-x}$Ni$\text{}_{x}$Te crystals were grown by the Bridgman method. The investigated samples were cut from five different ingots with nominal contents of nickel varied from 0.005 to 0.05. The investigations were performed using X-ray powder diffraction method and energy dispersive and wavelength dispersive electron microprobe analysis. The samples were ałso examined in a scanning electron microscope. Examinations of wavelength dispersive electron microprobe analysis show that the actual contents of nickel differ from the nominal values. The solubility limit of nickel was determined to be x = 0.005. The precipitates of NiTe were found in samples of a greater content of nickel. Their dimensions were between 5 to 90 micrometers. X-ray powder diffraction measurements did not reveal any significant change of the lattice constant of investigated crystals in comparison with pure CdTe.
    Źródło:
    Acta Physica Polonica A; 1994, 86, 5; 737-739
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Crystalline Structures of Some High Entropy Alloys Obtained by Neutron and X-Ray Diffraction
    Autorzy:
    Dahlborg, U.
    Cornide, J.
    Calvo-Dahlborg, M.
    Hansen, T.
    Leong, Z.
    Asensio Dominguez, L.
    Chambreland, S.
    Cunliffe, A.
    Goodall, R.
    Todd, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402077.pdf
    Data publikacji:
    2015-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.05.cp
    61.05.fm
    61.66.Dk
    Opis:
    The understanding of the structure and the stability of high entropy alloys is still incomplete and the mechanisms behind the composition-property relationships are unclear. One reason is that few systematic and accurate determinations of their composition-dependent structure on atomic level have been made. In this paper some results on the structure obtained by X-ray and neutron diffraction of the CoCrFeNi alloy, to which Pd, Sn and Cu have been added in different amounts, are reported. The investigations make it obvious that none of the alloys is completely homogeneous, as has earlier been suggested, and that they do not form a perfect solid solution.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 4; 552-556
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characterization of casting defects in the single crystal turbine blade airfoil
    Autorzy:
    Albrecht, R.
    Bogdanowicz, W.
    Sieniawski, J.
    Kubiak, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1075923.pdf
    Data publikacji:
    2016-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.72.Ff
    61.72.-y
    61.66.Dk
    Opis:
    In the paper turbine blades made from single crystal CMSX-4 superalloy were investigated by X-ray diffraction methods (topography, Ω-scan mapping) complemented by scanning electron microscopy observations. By the X-ray diffraction topography method several misorientation defects were visualized as well as dendrites arrangement. It was discussed that tip of the airfoil and thin walled area of the turbine blades located near the trailing edge can accumulate more growth defects than other airfoil part, due to the complex shape of the mould.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 4; 1091-1093
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dendrite growth in selector-root area of single crystal CMSX-4 turbine blades
    Autorzy:
    Bogdanowicz, W.
    Tondos, A.
    Krawczyk, J.
    Albrecht, R.
    Sieniawski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1058103.pdf
    Data publikacji:
    2016-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.66.Dk
    61.72.-y
    61.10.Nz
    Opis:
    The single crystal turbine blades made of CMSX-4 nickel-based superalloy were studied. The turbine blades were obtained by the Bridgman technique with withdrawal rate of 5 mm/min. The samples, cut-off from root part of blades and containing the fragment of the selector, were studied. The effect of selector geometry on the dendrites growth and defects formation in the selector-root area of the blade were analyzed. The Laue diffraction, scanning electron microscopy, and X-ray diffraction topography were applied. It was found that, during crystallization of the selector, the dendrite cores, after reaching the surface of mould, may bend, if the angle between dendrite cores and the mould surface was equal to 12°. When the angle was equal to 24° the growth of dendrites has been stopped. It can be stated that the defects, which appeared in the selector were inherited by the root part.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 4; 1107-1109
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    F-AlCoPdGe Alloy with Three Types of Pseudo-Mackay Clusters
    Autorzy:
    Sugiyama, K.
    Yubuta, K.
    Yokoyama, Y.
    Suzuki, S.
    Simura, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1373510.pdf
    Data publikacji:
    2014-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.66.Dk
    61.05.cp
    61.44.Br
    Opis:
    The structure of an F-AlCoPdGe alloy was determined by single-crystal X-ray diffraction analysis: space group Pa3̅ (No. 205), Pearson symbol cP1128-142.4, a = 24.4338(4) Å; R1 = 0.0526 for the observed 5106 reflections with $F_0$ > 4.0σ$(F_0)$. The F-AlCoPdGe alloy exhibited three types of pseudo-Mackay clusters (pMCs). The first shell of the Co(13)-pMC at 24d indicated a coordination polyhedron typically found in Al-Co binary approximants; the second shell was a combination of an M icosahedron and an Al icosidodecahedron, where M is a mixed site of Pd and/or Co. The first shell of the Co(14)-pMC at 4b consisted of 20 partially occupied Al positions arranged in a dodecahedral fashion; its second shell was also composed of an M icosahedron and an Al icosidodecahedron. The first shell of the Al(18)-pMC at 4a consisted of a combination of an M cube and an Al octahedron, resulting in the rhombic dodecahedral arrangement; its outer shell structure was similar to those of the other pMCs. The structure of the F-AlCoPdGe phase comprised an arrangement of these three types of pMCs together with interstitially placed Al icosahedra around the Pd/Al(1) and Pd/Al(2) sites.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 2; 588-593
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanical Alloying - a Novel Method for Synthesis and Processing of Materials
    Autorzy:
    Oleszak, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/2011001.pdf
    Data publikacji:
    1999-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.43.-j
    61.43.Dq
    61.66.Dk
    Opis:
    High energy ball milling (mechanical alloying) has recently become a popular research topic. As the non-equilibrium processing method, this technique may be used for the synthesis of many materials, including metastable ones. In many cases these materials exhibit the structure and properties quite different from materials prepared by conventional methods. In this paper some examples of metastable structures synthesized by mechanical alloying are described. The results of mechanical alloying in the Fe-Al system are presented as well.
    Źródło:
    Acta Physica Polonica A; 1999, 96, 1; 101-112
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Isomorphic Atom Substitution on Lattice Anisotropy of Thallium Dichalcogenide Layered Mixed Crystals
    Autorzy:
    Gasanly, N. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047086.pdf
    Data publikacji:
    2006-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.10.Nz
    61.66.Dk
    61.50.Ks
    Opis:
    Compositional variation of the lattice parameters of TlBX$\text{}_{2}$-type (B = Ga or In and X = S or Se) mixed crystals with monoclinic structure were studied by X-ray diffraction technique. The lattice anisotropy (c/b) of these mixed crystals changes linearly with substitution of the atoms located both at the centers and the vertices of the corresponding BX$\text{}_{4}$ tetrahedra. A brief survey of the important features of the effect of isomorphic atom substitution on the lattice anisotropy and the unit cell volume of TlBX$\text{}_{2}$-type mixed crystals with layered structure was presented.
    Źródło:
    Acta Physica Polonica A; 2006, 110, 4; 471-477
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Phase Transformations in Binary Alloys under High Pressure
    Autorzy:
    Degtyareva, V. F.
    Powiązania:
    https://bibliotekanauki.pl/articles/2030631.pdf
    Data publikacji:
    2002-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.50.Ks
    62.50.+p
    61.66.Dk
    Opis:
    High-pressure studies of binary alloy systems display some specific features connected with composition referring as a variable parameter. In a two-component system under pressure there are observed transformations, which do not occur in a one-component system. In particular, there is a formation of a single phase from a mixture of two phases or a decomposition of a uniform phase into two phases of different compositions. Alloys of In and Sn with neighbouring elements give us examples of these kinds of transformations. Studies on binary alloys with application of pressure provide experimental evidences that the alloy composition or electron concentration is one of the main factor for structural phase stability following from Hume-Rothery rule.
    Źródło:
    Acta Physica Polonica A; 2002, 101, 5; 675-688
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mould walls inclination and dendritic morphology of CMSX-4 blades airfoils
    Autorzy:
    Krawczyk, J.
    Bogdanowicz, W.
    Sieniawski, J.
    Kubiak, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1075667.pdf
    Data publikacji:
    2016-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.70.+w
    61.66.Dk
    61.72.Bb
    Opis:
    The airfoils of single-crystalline turbine blades were studied. The blades made of industrial CMSX-4 superalloy were obtained by the Bridgman technique. Five different withdrawal rates (1-5 mm/min) were used. Series of as-cast samples were prepared by cutting the airfoils at different distances from the blade root. The metallographic sections, prepared for each cutting planes, were subjected to scanning electron microscopy observations and Laue diffraction studies. Macrostructure images of whole area of airfoil cross-sections were obtained by stitching several obtained SEM images. Morphology of dendrites in different area of cross-sections were analysed. The crystal orientation of each sample were determined by analysis of Laue pattern. It was found that the morphology of dendrites changes in the area, where the dendrite growth is limited by inclined mould walls.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 4; 1100-1103
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Alpha Variant Selection Determined from Grain Misorientations in Ti-6Al-7Nb Alloy with a Duplex Microstructure
    Autorzy:
    Harcuba, P.
    Václavová, K.
    Čapek, J.
    Stráský, J.
    Janeček, M.
    Janovská, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402083.pdf
    Data publikacji:
    2015-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.66.Dk
    61.72.Mm
    68.37.-d
    Opis:
    Titanium occurs in two structures; a high temperature body-centered cubic structure which is known as β phase and an ambient temperature α phase which has the hexagonal closed-packed structure. In the present study a biomedical Ti-6Al-7Nb alloy was investigated. The so-called duplex structure consisting of α lamellae and equiaxed primary α-grains was prepared by a thermal treatment. The α lamellae are created during cooling from a β-field according to the Burgers relation. This relation allows the formation of the α lamellae with different crystallographic orientations - so-called variants. The preferential misorientation between α lamellae was studied by a detailed electron backscattered diffraction analysis. The misorientation of grains in the duplex structure was modelled by a sum of random Mackenzie distribution and Gaussian peaks related to the preferred misorientations according to the Burgers relation. The preferred misorientations based on the Burgers relationship were identified in the biomedical Ti-6Al-7Nb alloy with duplex structure. It is confirmed that the variant selection of α lamellae is not random.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 4; 570-573
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Boriding of binary Ni-Ti and ternary Ni-Ti-Cu shape memory alloys
    Autorzy:
    Ucar, N.
    Turku, N.
    Ozdemir, A.
    Calik, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1065676.pdf
    Data publikacji:
    2016-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.66.Dk
    61.72.-y
    62.20.Qp
    Opis:
    In this work, the boriding of binary (Ni-Ti) and ternary (Ni-Ti-Cu) shape memory alloys was carried out in a solid medium at 1173 K for 8 h using the powder pack method with Ekabor-Ni powders. Characterization of boride layer formed on the surface of alloys was identified by optical microscopy and scanning electron microscopy. TiB₂, NiB₂ and SiC phases in the boride layer of borided binary (Ni-Ti) and ternary (Ni-Ti-Cu) shape memory alloys was confirmed by X-ray diffraction analysis. The microhardness and thickness of the boride layers were measured. The obtained hardness values show a hardness anomaly due to porosity and structural defects with increase of Cu content, while a decrease in the value of hardness moving from the boride layer to main structure was observed.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 1; 492-495
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Compressibility of $AgI-Ag_{2}MoO_{4}$ System Measured in Wide Range of Composition
    Autorzy:
    Wiśniewski, Z.
    Wiśniewski, R.
    Wilczyńska, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1538417.pdf
    Data publikacji:
    2010-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.43.Er
    61.66.Dk
    62.50.-p
    Opis:
    Results of compressibility measurements of $AgI-Ag_{2}MoO_{4}$ materials for different concentrations of AgI were presented. The obtained results were compared with phase diagram and internal structure of material. It was found that observed values of compressibility coefficient can be related to internal structure of investigated material.
    Źródło:
    Acta Physica Polonica A; 2010, 117, 4; 601-602
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Heating Rate on the Formation of Intermetallics during SHS Process
    Autorzy:
    Novák, P.
    Michalcová, A.
    Školáková, A.
    Průša, F.
    Kříž, J.
    Marek, I.
    Kubatík, T.
    Karlík, M.
    Haušild, P.
    Kopeček, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402079.pdf
    Data publikacji:
    2015-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.66.Dk
    65.40.-b
    61.05.cp
    Opis:
    Self-propagating high-temperature synthesis is a simple and efficient method for the synthesis of various compounds including ceramics and intermetallics. In this process, the compressed mixture of elemental or master alloy powders is ignited or heated to initiate the exothermic reactions leading to the formation of desired compounds. In order to control the process efficiently, the effect of several important parameters has to be determined in each applied alloy system. Previous results showed that those parameters are: initiation temperature, process duration, pressure used for compression and heating rate. This paper is devoted to the description and explanation of the effect of the heating rate on the formation of intermetallics during self-propagating high-temperature synthesis in Fe-Al and Ni-Ti systems. Differential thermal analysis of compressed powder mixtures under various heating conditions and microstructure observation of samples prepared by various heating rates using electric resistance heating and spark plasma sintering were carried out. The effect of heating rates on the formations of intermetallics in studied systems is discussed in this paper.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 4; 561-563
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preparation and Optical Properties of Zn$\text{}_{1-x}$Mn$\text{}_{x}$Te$\text{}_{1-y}$O$\text{}_{y}$ Highly Mismatched Alloy
    Autorzy:
    Avdonin, A.
    Van Khoi, Le.
    Pacuski, W.
    Domukhovski, V.
    Gałązka, R. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047712.pdf
    Data publikacji:
    2007-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.66.Dk
    61.72.Vv
    78.55.-m
    Opis:
    The Zn$\text{}_{1-x}$Mn$\text{}_{x}$Te$\text{}_{1-y}$O$\text{}_{y}$ alloy was prepared using a rapid crystallization technique. X-ray diffraction measurements were used to estimate the oxygen doping level. It is demonstrated that the oxygen solubility in Zn$\text{}_{1-x}$ Mn$\text{}_{x}$Te$\text{}_{1-y}$O$\text{}_{y}$ alloys greatly depends on the manganese concentration. No oxygen related effects were observed in the manganese free samples. The highest value of the oxygen molar fraction (y) achieved in the present study was 0.0023 in a sample having manganese fraction (x) of 0.056. The decrease in the alloy band gap was observed with increasing oxygen content. The oxygen-related trap level in Zn$\text{}_{1-x}$Mn$\text{}_{x}$Te$\text{}_{1-y}$O$\text{}_{y}$ was found to be strongly shifted with respect to that in ZnTe$\text{}_{1-y}$O$\text{}_{y}$. The shift is assigned to a creation of complex (Mn$\text{}_{x}$O) traps.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 2; 407-414
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Czochralski Method for Crystal Growth οf Reactive Intermetallics
    Autorzy:
    Talik, E.
    Oboz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399478.pdf
    Data publikacji:
    2013-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.Lp
    81.10.Fq
    61.66.Dk
    Opis:
    Czochralski method of crystallization allows obtaining single crystals of many intermetallic compounds. New series $Gd_7Ni_xPd_{3-x}$ (x=2, 3) intermetallics was grown by the modified Czochralski method using a levitated melt in protective argon atmosphere. Preliminary studies of magnetic properties have shown that all crystals of the series order ferromagnetically. It was found that $Gd_7Ni_2Pd$ shows magnetic transition to the ferromagnetic state at 225 K while $Gd_7Ni_3$ orders at 145 K.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 2; 340-343
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mössbauer, XRD, and SEM Study of FeAl-Based Powder Alloys with Nanoinclusions
    Autorzy:
    Zaleski, A.
    Fedotova, J.
    Ilyuschenko, A.
    Talako, T.
    Belyaev, A.
    Letsko, A.
    Stanek, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2046435.pdf
    Data publikacji:
    2006-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.66.Dk
    81.20.Ev
    82.80.Ej
    Opis:
    Peculiarities of phase composition and morphology in nanostructured (Fe$\text{}_{70}$Al$\text{}_{30}$)$\text{}_{1-x}$(Al$\text{}_{2}$O$\text{}_{3}$)$\text{}_{x}$ (x=64-80 wt.%) powder alloys prepared by self-propagated high temperature synthesis have been studied by $\text{}^{57}$Fe transmission Mössbauer spectroscopy, scanning electron microscopy, and X-ray diffraction. It has been established that phase composition of alloys has not been affected by Al$\text{}_{2}$O$\text{}_{3}$ contribution. Contrary, atomic arrangement in B2 FeAl phase depends on the volume fraction of Al$\text{}_{2}$O$\text{}_{3}$ resulting in the migration of Al atoms from B2 FeAl lattice.
    Źródło:
    Acta Physica Polonica A; 2006, 109, 3; 441-444
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Theoretical Calculations of Cohesive and Electronic Properties of Quaternary AlGaInN Alloys
    Autorzy:
    Łopuszyński, M.
    Bartoszek, J.
    Majewski, J. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047722.pdf
    Data publikacji:
    2007-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.66.Dk
    61.66.-f
    62.20.Dc
    64.30.+t
    Opis:
    We present theoretical studies of the AlGaInN nitride quaternary alloys. The studies are based on ab initio calculations performed within the density functional theory and virtual crystal approximation. The equilibrium lattice constants, bulk moduli, and elastic constants were calculated for the whole possible range of concentrations of the alloy constituents. The theoretical values were then fitted with second- and third-order polynomials. For all properties studied, the considerable bowing was observed.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 2; 449-454
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High resolution TEM investigations and TDA analysis of zinc alloy with strontium addition
    Autorzy:
    Labisz, K.
    Krupiński, M.
    Pawlyta, M.
    Matus, K.
    Kremzer, M.
    Dopierała, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1153727.pdf
    Data publikacji:
    2016-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.37.Og
    81.70.Pg
    61.66.Dk
    Opis:
    In this paper there are presented results of high resolution transmission electron microscope investigation concerning the structure of the Zn-Al-Si cast zinc alloy with Sr addition for crystal structure refinement after thermo-derivative analysis performed using the universal metallurgical simulator and analyzer platform. The thermo-derivative analysis allows to determine the specific points of the solidifying alloy, which is helpful for phase determination and proper heat treatment condition determination, allowing to reduce the energy costs and obtaining higher mechanical and functional properties. Using transmission electron microscopy, especially selected area diffraction method appliance it was possible to determine the phases occurring in the alloy in the state after chemical composition modification as well as after appliance of very precisely controlled cooling rate. The morphology and size of the microstructure of micro-sized eutectic was possible to determine as well the lattice parameters of the Zn α -phase. Particularly the overview will be also directed on the high resolution transmission electron microscope to achieve good insight into the structural changes on the atomic scale.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 4; 823-826
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dependence of Tin Whisker Growth on Copper and Oxygen Content on the Surface of Tin-Rich Lead Free Alloys
    Autorzy:
    Skwarek, A.
    Witek, K.
    Pluska, M.
    Czerwinski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399972.pdf
    Data publikacji:
    2013-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.66.Dk
    68.70.+w
    68.37.Hk
    Opis:
    The introduction of lead-free technology into electronics has intensified concern over tin whiskers phenomenon. Tin whiskers are crystals growing from the alloy surface as the result of compressive stress relaxation. This paper presents the dependence of tin whisker growth on copper and oxygen surface content. The observations and measurements were done using scanning electron microscopy with energy-dispersive X-ray spectroscopy. The results show that whisker growth is strongly related to increased copper and oxygen surface content in whisker neighborhood.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 2; 430-431
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of Ultrathin In-Ag Layers οn Tungsten by Means of Surface Spectroscopy Techniques
    Autorzy:
    Bukaluk, A.
    Trzcinski, M.
    Okulewicz, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047911.pdf
    Data publikacji:
    2008-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.05.jh
    61.46.Hk
    61.66.Dk
    68.37.Ef
    Opis:
    Auger electron spectroscopy, X-ray photoelectron spectroscopy, ultraviolet photoelectron spectroscopy, scanning tunnelling microscopy, low energy electron diffraction, and thermodesorption methods were used to investigate the process of growth of ultrathin In films and formation of In-Ag surface alloys on tungsten substrate. Several indium layers, having coverage ranging from 0.2 to 0.8 ML were deposited on tungsten substrate in room temperature. It was found that at the lowest coverages (Θ= 0.1-0.3 ML) indium atoms form (3×1) structure, characterized by very sharp low energy electron diffraction patterns. With increasing Θ they tend to form densely packed islands interpreted as slightly distorted In(111) monolayers. Surface diffusion of In onto the tungsten surface was studied by using ESCA imaging property of SCIENTA ESCA200 instrument. Measuring the photoelectron intensity as a function of two spatial coordinates and the energy, we observed movement of In atoms on the tungsten surface. On the basis of the change of surface coverage with distance surface the diffusion coefficient was evaluated at the temperature range of 400-700 K. Intermixing of ultrathin films of indium and silver, after their surface diffusion from the sample edges to the centre of the tungsten surface, were observed by using X-ray photoelectron spectroscopy, ultraviolet photoelectron spectroscopy and the Auger electron spectroscopy methods. Intermixing was controlled by means of photoemission spectra from the valence states and the In 4d level, as well as by X-ray photoelectron spectroscopy studies of indium and silver core levels excited by Al K$\text{}_{α}$ source.
    Źródło:
    Acta Physica Polonica A; 2008, 114, S; S-17-S-28
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Deformation on Positron Annihilation in Decomposing Copper Alloys
    Autorzy:
    Mikhalenkov, V. S.
    Hautojärvi, P.
    Vehanen, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1933528.pdf
    Data publikacji:
    1995-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.30.Mh
    61.66.Dk
    61.72.Ff
    78.70.Bj
    Opis:
    Positron lifetime spectra were measured in the quenched or slowly cooled Cu-3.93 at.% Ag alloy, subjected to subsequent cold rolling, as a function of isochronal annealing temperature. The results were compared with the formerly obtained data for quenched, but not deformed, C͟u-Ag alloy and for deformed C͟u-Ge solid solution. All lifetime spectra, after background and source corrections, are single exponential with the lifetimes which exceed those in well-annealed Cu solid solutions. This gives evidence to positron annihilation from a trapped state. One-component spectra may then testify to existence of a set of different traps with too weak distinction in the individual positron lifetime to be resolved as separate components. At low annealing temperatures the stage arisen from continuous decomposition is not revealed, being masked by the removal of deformation defects. The stages of discontinuous decomposition and of subsequent precipitates coagulation turn out to depend on the sample history. The role of deformation defects in the decomposition of supersaturated solid solutions is attempted to be accounted for in a wide range of annealing temperatures.
    Źródło:
    Acta Physica Polonica A; 1995, 88, 1; 199-204
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characterizing the effects of hot isostatic pressing on IN713C superalloy blade microstructure by electron backscatter diffraction
    Autorzy:
    Chmiela, B.
    Kościelniak, B.
    Roskosz, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1075636.pdf
    Data publikacji:
    2016-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.66.Dk
    07.20.Pe
    81.40.Vw
    61.05.jd
    Opis:
    The integrity of turbine blades is essential for the safe operation of jet engines. Thus, the mechanical properties, especially creep resistance and fatigue strength at high temperatures, must be thoroughly optimized. In particular, it has previously been observed that the mechanical properties of blades depend on the microstructure and porosity resulting from the casting process. To decrease the internal porosity generated by investment casting, hot isostatic pressing can be applied. This paper aims to evaluate the effects of hot isostatic pressing on the microstructure of IN713C alloy blades. Two variants of hot isostatic pressing treatment, differing in pressure, were carried out, and each resulted in lowered porosity. Microstructural investigations, performed using scanning electron microscopy and electron backscatter diffraction revealed significant changes of γ' particles and high strain intensity in the surface layer of the blades after hot isostatic pressing treatment.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 4; 1097-1099
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Surface Characterization of 309 and 310 Steel after the Corrosion in Wood Biomass Ash
    Autorzy:
    Dębowska, A.
    Kopia, A.
    Kalemba-Rec, I.
    Petrzak, P.
    Magdziarz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032929.pdf
    Data publikacji:
    2017-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.66.Dk
    61.05.cp
    68.37.Hk
    88.20.dd
    Opis:
    The aim of this study was to investigate the influence of biomass ashes - specifically wood biomass ash - on the surface of austenitic stainless steel 309 and 310. The process was carried out for 1000 h at 650°C. The microstructure and chemical composition of corrosion products were examined by scanning electron microscopy with energy dispersive spectroscopy analysis. Phase analysis of corrosion product were done by X-ray diffraction and ash composition was investigated by X-ray fluorescence. It was observed that wood biomass ash caused the corrosion of the steel surface. On the surface of the steels exposed to wood biomass ash the layer of corrosion products was observed, mostly chromium, nickel and iron oxide. The thickness of mill scale formed during the process was in the range of h=15-30 μm.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 5; 1387-1389
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    PSG method for simulating agglomeration of Al₂O₃ inclusions in liquid steel
    Autorzy:
    Kalisz, D.
    Żak, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1065339.pdf
    Data publikacji:
    2016-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.66.Dk
    61.82.Bg
    81.30.Mh
    94.20.Qq
    Opis:
    A quantitative description of the non-metallic inclusions removal from liquid steel is the most important element of secondary metallurgy. Authors made an attempt at calculating balance of Al₂O₃ particles during turbulent flow, which represents the steel refining conditions. For this purpose a special program was worked out. The agglomeration of non-metallic inclusions in liquid steel was modeled with the particle grouping method. Calculations were performed for steel with 300 and 500 ppm oxygen content. Then the quantity of generated aluminum oxide was calculated. Various mixing rates of the melt, corresponding to the actual conditions in the ladle, were applied. Simulations were performed for 6 groups of particles for the initial size of inclusions 1, 3, and 5 μ m. The size interval for each group was predefined very strictly. The diameter increase and particle number reduction of the successive groups were graphically presented in plots. In the initial phase the rate of particle removal was very high, especially when high mixing energies were involved. This calculation procedure realistically describes the agglomeration and elimination of non-metallic inclusions in the secondary metallurgical processes and can be implemented for modeling this type of processes.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 1; 157-159
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    X-ray diffraction and EBSD study of Al-Ti-Co-Ni-Fe high-entropy alloy
    Autorzy:
    Górecki, K.
    Bała, P.
    Cios, G.
    Stępień, M.
    Kozieł, T.
    Wieczerzak, K.
    Tokarski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1153214.pdf
    Data publikacji:
    2016-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.30.-t
    61.05.C-
    68.37.Hk
    61.66.Dk
    Opis:
    Al₁₅Ti₂₀Co₂₀Ni₂₅Fe₂₀ alloy, synthesized in an arc furnace, was characterized by microscopic investigations, X-ray diffraction and electron backscatter diffraction techniques. Theoretical assumptions indicate a dual-phase crystal structure fcc+bcc. It was shown that dendrites and eutectic are bcc phase, and the interdendritic region is fcc phase.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 4; 991-992
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Leaching of Al-Based Polygrain Quasicrystalline and Related Crystalline Surfaces
    Autorzy:
    Yadav, T.
    Mishra, S.
    Pandey, S.
    Singh, D.
    Lowe, M.
    Tamura, R.
    Mukhopadhyay, N.
    Srivastava, O.
    McGrath, R.
    Sharma, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1373698.pdf
    Data publikacji:
    2014-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.44.Br
    81.16.Hc
    61.66.Dk
    68.37.Hk
    Opis:
    In the present investigation, we have studied leaching on polygrain Al-based quasicrystalline $(i-Al_{63}Cu_{25}Fe_{12})$ as well as crystalline (B2 phase; $Al_{55}Cu_{30}Fe_{15})$ alloy surfaces using a 10 mole NaOH solution. The surface was leached at varying times from 30 min to 8 h and subsequently characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy and energy dispersive X-ray analysis. Leaching of the samples for 30 min generated a homogeneous layer. However further leaching for 1-8 h yielded nano-size particles on the surface. Spherical microstructure has been observed on the Al-Cu-Fe crystalline surface whereas on the quasicrystalline surface a petal-like microstructure appeared. The implications of the evolution of different microstructures in the context of structure, stability and activity are discussed. The results are compared with the microstructure of leached polygrained samples containing a mixture of different surface orientations.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 2; 629-632
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Positron Annihilation Study of the Ageing Effects in the Cu-Zn-Sn Parent Phase
    Autorzy:
    Frąckowiak, J. E.
    Płotkowski, K.
    Salamon, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1933578.pdf
    Data publikacji:
    1995-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.80.+y
    61.72.-y
    61.66.Dk
    78.70.Bj
    Opis:
    A study of ageing effects on the structure of Cu-Zn-Sn shape memory alloys was performed using the $\text{}^{119}$Sn Mössbauer spectroscopy and positron annihilation techniques (the positron lifetime, and Doppler broadening line-shape S-parameter measurements). Two stages of ageing at 200°C connected with redistribution of Sn atoms were observed.
    Źródło:
    Acta Physica Polonica A; 1995, 88, 2; 327-332
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructure Mechanisms Governing the Creep Life of Ultrafine-Grained Cu-0.2 wt%Zr Alloy
    Autorzy:
    Kral, P.
    Svoboda, M.
    Dvorak, J.
    Kvapilova, M.
    Sklenicka, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1418438.pdf
    Data publikacji:
    2012-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.-t
    61.66.Dk
    62.20.Hg
    68.37.Lp
    Opis:
    Equal-channel angular pressing was conducted at room temperature and extrusion was performed up to 12 passes using route where the billets were rotated by 90° in the same sense between consecutive passes. Tensile creep tests were performed at 473, 573 and 673 K at different constant applied stresses. It was observed that the original coarse grain size of unprocessed alloy was reduced to 0.3 μm after 8 equal-channel angular pressing passes and the grain growth during creep was restricted by precipitates with the mean diameter ≈ 4.0 nm. No significant effect on creep resistance was found after one equal-channel angular pressing pass at 473 and 573 K. However, the longest time to fracture was exhibited by alloy after 2 equal-channel angular pressing passes at 573 and 673 K but with further increasing number of equal-channel angular pressing passes a decrease in the time to fracture was observed. Nevertheless, the beneficial effect of equal-channel angular pressing on creep resistance was still documented after 8 passes for temperatures of 473 and 573 K. By contrast, creep tests performed at 673 K showed that the time to fracture of ultrafine-grained material is shorter as compared with that for as-received state. The 3D laser measurement of surface showed that the creep fracture process is accelerated by formation of vertical surface step relief and cavitation at the intersection of the shear bands during creep.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 3; 457-460
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of phase transformations in inconel 625 alloy during annealing
    Autorzy:
    Petrzak, P.
    Kowalski, K.
    Blicharski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1152530.pdf
    Data publikacji:
    2016-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.66.Dk
    64.75.Nx
    81.05.Bx
    81.30.Fb
    Opis:
    The investigation focused on the characterization of the microstructure and chemical composition changes after annealing. The research was conducted on the Inconel 625 weld overlay deposited on a boiler steel. The annealing was performed for 10 h at temperatures from 600 to 1000°C. The microstructure and chemical composition were examined by scanning electron microscope and transmission electron microscope equipped with an energy dispersive X-ray spectrometer. Weld overlays were produced by an innovative method of cold metal transfer.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 4; 1041-1044
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Curie Temperature and Density of States at the Fermi Level for Al-Cu-Fe Phases: β-Solid State Solution-Approximants-Icosahedral Quasicrystals
    Autorzy:
    Shalaeva, E.
    Prekul, A.
    Shchegolikhina, N.
    Medvedeva, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1373475.pdf
    Data publikacji:
    2014-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.20.-g
    71.23.Ft
    71.20.-b
    61.66.Dk
    Opis:
    A consistent reduction in the absolute value of the negative paramagnetic Curie temperature was found in a series of Al-Cu-Fe phases: β(CsCl)-solid state solution, noncanonical approximant (η-AlCu(Fe) phase), rational approximants (P1+P2-pentagonal phases) and icosahedral quasicrystal. For these Al-Cu-Fe phases, the decrease in the Curie temperature correlates with a reduction of the density of states at the Fermi level which was estimated from the low-temperature heat capacity measurements and first-principles calculations. The observed correlation was related to the antiferromagnetic indirect exchange interaction (Ruderman-Kittel-Kasuya-Yosida interaction) between the localized magnetic moments on Fe induced by the intrinsic structural defects in the Al-Cu-Fe phases. The weakening of Fe 3d-Al s, p hybridization owing to the intrinsic structural defects such as vacancies, antisite defects and distortions of coordination polyhedrons is suggested to be the main mechanism of appearance of localized magnetic moments on Fe atoms.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 2; 572-576
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Metallurgical Characterization of Hot Tearing Curves Recorded during Solidification of Magnesium Alloys
    Autorzy:
    Huang, Y.
    Wang, Z.
    Srinivasan, A.
    Kainer, K.
    Hort, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1418495.pdf
    Data publikacji:
    2012-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    64.70.D-
    62.20.mt
    61.25.Mv
    61.66.Dk
    61.72.Mm
    Opis:
    This work investigates the hot tearing behavior of Mg-Al and Mg-Zn alloys quantitatively based on the measurement of contraction force using an experimental setup which was developed at MagIC. An emphasis is given on the analysis of typical hot tearing curves to understand the corresponding metallurgical phenomena shown by these curves. The recorded hot tearing curves, i.e. the contraction force vs. temperature or time, contain valuable metallurgical information. They give not only the precise temperature at which the hot tearing initiates, but also depict information about the propagation of hot cracks. Combined with thermodynamic calculations, the critical solid fraction corresponding to the occurrence of hot tearing can be calculated. Further microstructural observations were performed. Several phenomena such as the crack propagation and refilling of cracks, which influence the slope of hot tearing curves, are also discussed.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 3; 497-500
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure of chitosan-ZnO layers electrophoretically deposited on NiTi shape memory alloy
    Autorzy:
    Goryczka, T.
    Kokoszka, A.
    Kowalski, P.
    Łosiewicz, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1112222.pdf
    Data publikacji:
    2016-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.10.Nz
    61.66.Dk
    68.37.Hk
    81.30.Kf
    87.68.+z
    Opis:
    The surface of NiTi shape memory was modified by deposition of chitosan-ZnO thin film. The electrodeposition process was carried out at room temperature at voltage-time conditions: 10 V/30 s, 10 V/300 s, 20 V/30 s, or 20 V/300 s. Structure of the obtained coatings was studied by means of grazing incidence beam X-ray diffraction. Distribution of the zinc oxide particles in the chitosan matrix was observed with use of scanning electron microscopy. It was found that depending on the electrodeposition parameters, the structure of the obtained chitosan-ZnO coatings varies from amorphous to coarse-grained.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 4; 1056-1058
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    SEM and X-Ray Diffraction Studies on Microstructures in Cu-26.04%Zn-4.01%Al Alloy
    Autorzy:
    Aldirmaz, E.
    Celik, H.
    Aksoy, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399514.pdf
    Data publikacji:
    2013-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.66.Dk
    07.85.Nc
    61.05.cp
    68.37.Hk
    81.10.Aj
    Opis:
    Due to fact that Cu-based alloys are very sensitive to the thermal treatments, in scanning electron microscopy and X-ray diffraction observations, according to the different quenching techniques Cu-26.04%Zn-4.01%Al alloys can display different product phases such as martensite and precipitation. Rapidly cooling sample was formed as M18R structure from the ordered $DO_3$ phase and in the monoclinic case, β=89.1° determined for sample. It was seen that a α-precipitation (fcc) phase in the matrix is slowly cooling.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 1; 87-89
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analytical Electron Microscopy Studies of the CMSX-4 Single Crystal Superalloy Subjected to High Temperature Annealing
    Autorzy:
    Dubiel, B.
    Indyka, P.
    Kalemba-Rec, I.
    Moskalewicz, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1033055.pdf
    Data publikacji:
    2017-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.66.Dk
    68.37.Hk
    68.37.Lp
    68.37.Ma
    82.80.Ej
    Opis:
    The aim of the present work is to investigate the development of the γ/γ' microstructure and the changes in chemical composition of γ and γ' phases during high temperature annealing of CMSX-4 superalloy at a temperature of 1100°C in the time range from 500 to 2500 h. The studies were performed by means of scanning electron microscopy and the modern scanning-transmission electron microscopy with Super-X EDS system of four SDD detectors. Results of scanning electron microscopy and scanning-transmission electron microscopy analyses have shown that the microstructure of CMSX-4 superalloy is unstable during ageing at high temperature and the coalescence of cuboidal γ' precipitates was observed. Energy dispersive X-ray microanalysis revealed the distribution of particular alloying elements in the γ and γ' phases and the differences in their concentration in the function of the annealing time.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 5; 1375-1378
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Co_2FeSi Heusler Alloy Prepared by Arc Melting and Planar Flow Casting Methods: Microstructure and Magnetism
    Autorzy:
    Titov, A.
    Životský, O.
    Hendrych, A.
    Janičkovič, D.
    Buršík, J.
    Jirásková, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032650.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.66.Dk
    75.50.Bb
    75.60.-d
    75.60.Ej
    75.70.Rf
    Opis:
    This paper is devoted to studies of the structural and magnetic properties of Co_2FeSi Heusler alloy produced by arc melting resulting in samples with large grains compared to finer-grained ribbon type samples prepared by planar flow casting. The scanning electron microscopy completed by energy dispersive X-ray spectroscopy, X-ray diffraction, and magnetic methods sensitive to both bulk and surface were applied. The chemical composition inside the grains was found to be in agreement with the nominal one while at the grain boundaries enrichment on Co and Si at expense of Fe was observed. The magnetic parameters derived from the bulk hysteresis curves resulted in nearly the same values of coercivity, about 1 kA/m, for both technological procedures while magnetization was of about 15 A m²/kg higher at ribbons compared with sample prepared by arc melting, 145 A m²/kg. The surface magnetic characteristics were visibly influenced by a surface magnetic anisotropy. The smooth polished surface of the sample prepared by arc melting has allowed visualizing the magnetic domain structure inside the grains and at grain boundaries by the magneto-optical Kerr microscopy and magnetic force microscopy.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 654-656
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural Chemistry and Magnetic Properties of $R_2Ni_{2-x}In$ (R=Gd-Er, x=0.22 or 0.3) Compounds
    Autorzy:
    Tyvanchuk, Yu.
    Baran, S.
    Jaworska-Gołąb, T.
    Duraj, R.
    Kalychak, Ya.
    Szytuła, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1489895.pdf
    Data publikacji:
    2012-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Cr
    75.30.Kz
    61.10.-i
    61.66.Dk
    75.40.Gb
    75.50.Ee
    Opis:
    X-ray diffraction and magnetic measurements of $R_2Ni_{2 - x}In$ (R = Ho, Dy, x = 0.3 and R = Gd, Tb, Er, x = 0.22) compounds are reported. The compounds crystallize in the tetragonal $Mo_2FeB_2$-type crystal structure (space group P4/mbm). Magnetic measurements reveal antiferromagnetic order with the Néel temperatures $T_{N}$ equal to 26.4 K (Gd), 20.2 K (Tb), 8.3 K (Dy), 7.1 K (Ho), and 6.3 K (Er). For R = Gd, Tb and Er an additional phase transition below $T_{N}$ is observed at 13.5, 13.1, and 5.0 K, respectively.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 3; 678-681
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analytical electron microscopy investigation of topologically close-packed phases in CMSX-4 single crystal superalloy
    Autorzy:
    Dubiel, B.
    Indyka, P.
    Kalemba-Rec, I.
    Moskalewicz, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1154000.pdf
    Data publikacji:
    2016-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.66.Dk
    68.37.Hk
    68.37.Lp
    68.37.Ma
    82.80.Ej
    61.05.J-
    Opis:
    In this work the topologically close-packed phases precipitated during annealing of CMSX-4 single-crystal superalloy at temperature 1100°C were investigated. Microstructural analyses were carried out by means of scanning- and transmission electron microscopy as well as scanning-transmission electron microscopy in high angle annular dark field mode. Chemical composition in nanoareas was determined using energy dispersive X-ray spectroscopy. Scanning electron microscopy investigation has shown that the topologically close-packed precipitates were formed already after 50 h of annealing at temperature 1000°C. With prolongation of the annealing time up to 2500 h the change of the morphology of topologically close-packed particles from blocky to needle-like occurred. Selected area electron diffraction analysis indicated that the topologically close-packed precipitates are the orthorhombic P phase. Quantitative energy dispersive X-ray spectroscopy analysis revealed that the topologically close-packed precipitates are enriched mostly in Re and W.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 4; 1110-1113
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of deformation on the transformation temperatures of martensite and bainite structures in Cu-9.97%Al-4.62%Mn alloy
    Autorzy:
    Aldirmaz, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1075528.pdf
    Data publikacji:
    2016-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.66.Dk
    68.37.Hk
    81.30.Kf
    81.30.Mh
    62.20.-x
    65.40.-b
    Opis:
    At present study of Cu-9.97%Al-4.62%Mn alloy system is used. Some physical properties of martensitic and bainite phase transformatios in Cu-9.97%Al-4.62%Mn (wt%) alloy were investigated by means of scanning electron microscopy and differential scanning calorimetry. In scanning electron microscope observations of Cu-9.97%Al-4.62%Mn alloy were noted two kinds of martensitic phases. These phases were defined as β'₁ (M18R) and γ'₁ (2H) martensites structures. According to differential scanning calorimetry measurement results, the deformation induced temperature is expected to be higher than the thermally induced temperature in Cu-9.97%Al-4.62%Mn alloy for martensite and bainite structures.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 1; 40-42
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Phase Composition of the Surface Zone of Nitrided Cast Steels and Their Mechanical Properties
    Autorzy:
    Brzózka, K.
    Budzynowski, T.
    Górka, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1506569.pdf
    Data publikacji:
    2011-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.66.Dk
    81.65.Lp
    81.40.-z
    76.80.+y
    61.05.cp
    68.37.-d
    81.40.Pq
    Opis:
    Conversion electron Mössbauer spectroscopy and structural X-ray diffractometry have been used to study nitrides formation in the surface layer of cast steels subjected previously to low-temperature nitriding. It has been found that creation of iron-nitrogen phases strongly depends on sample composition. Nitrides: $γ^\prime-Fe_{4}N$ and $\epsilon-Fe_{2-3}N$ arise in the course of the nitriding procedure in most investigated cast steels. Moreover, considerable changes in their microstructure and tribological properties occur. The depth profile of nitrides has been derived for selected cast steel.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 1; 28-32
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    First-Principles Calculations of Structural, Electronic, Optical, and Thermodynamic Properties of CdS, CdTe and Their Ternary Alloys $CdS_{1-x}Te_{x}$ (0.0 ≤ x ≤1.0)
    Autorzy:
    Ameri, M.
    Mesbah, S.
    Al-Douri, Y.
    Bouhafs, B.
    Varshney, D.
    Ameri, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1364167.pdf
    Data publikacji:
    2014-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    31.15.E-
    63.20.dk
    04.25.-g
    78.66.Hf
    73.61.At
    Opis:
    Using first-principle method, we investigate the structural, electronic, optical, and thermodynamic properties of the $CdS_{1-x}Te_x$ semiconductor alloys using generalized gradient approximation for the exchange-correlation potential calculation. The ground state properties are determined for the bulk materials (CdS and CdTe) in cubic phase. Quantities such as the lattice constants and bulk modulus of interest are calculated. Detailed comparisons are made with published experimental and theoretical data and show generally good agreement. The calculated lattice constants scale linearly with composition (Vegard's law). The microscopic origins of the bowing parameter were explained using the contributions from volume deformation, charge transfer and structural relaxation approach. The refractive index and optical dielectric constant for the alloys of interest were calculated by using different models. In addition, the thermodynamic stability of the alloys was investigated by calculating the critical temperatures of alloys.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 5; 1110-1117
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-53 z 53

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