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Wyszukujesz frazę "Wagner, M." wg kryterium: Autor

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    Wyświetlanie 1-8 z 8
    Tytuł:
    Annealing Effects after Various Thermo-Mechanical Treatments on Microstructure and Mechanical Properties of Wrought Magnesium Alloy ZK60
    Autorzy:
    Oo, M.
    Janeček, M.
    Kral, R.
    Wagner, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1419020.pdf
    Data publikacji:
    2012-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.40.Gh
    81.07.Bc
    61.05.cp
    Opis:
    The magnesium alloy ZK60 received from Dead Sea Magnesium in direct-chill cast condition was extruded at T = 350C using an extrusion ratio of ER = 12. The extruded bars were severely plastically deformed at 250C by either equal channel angular pressing or swaging. While swaging led to similar grain refinements as observed after equal channel angular pressing, yield stress and tensile strength values were by far superior in the swaged material. This result is explained by the unfavourable 45° texture component of the (0002) pole figure that develops during the massive shear deformation in equal channel angular pressing. Unlike equal channel angular pressing, the grain orientation after swaging is similar as in the as-extruded condition. Annealing at elevated temperatures indicates very low thermal stability of microstructure and mechanical properties in the equal channel angular pressing material while both properties in the swaged microstructure are as stable as in the as-extruded reference.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 3; 606-609
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Antisites Defects in GaP
    Autorzy:
    Jasiński, J.
    Kamińska, M.
    Palczewska, M.
    Jurkiewicz-Wagner, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1929675.pdf
    Data publikacji:
    1993-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.55.Eq
    78.50.Ge
    76.30.Mi
    Opis:
    ESR, optical, and transport measurements were done on neutron-irradiated GaP crystals subjected to thermal annealing. The behavior of two dominant paramagnetic defects: phosphorus antisite PP4 and WA1 [1] was followed. ESR signal similar to WA1 was earlier attributed to the defect related with gallium antisite [2]. Our thermal annealing experiments supported such attribution. Apart from that, the obtained results indicated that two dominant absorption bands in neutron-irradiated GaP with maxima at 0.79 and 1.13 eV [1] were not connected with PP$\text{}_{4}$ or WA1 defects. However, one of these paramagnetic defects (or two of them) were responsible for hopping transport in n-irradiated GaP crystals.
    Źródło:
    Acta Physica Polonica A; 1993, 84, 3; 579-582
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Microstructure on the Corrosion Resistance of the AE42 Magnesium Alloy Processed by Rotary Swaging
    Autorzy:
    Minárik, P.
    Zemková, M.
    Král, R.
    Mhaede, M.
    Wagner, L.
    Hadzima, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402163.pdf
    Data publikacji:
    2015-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.-t
    82.45.Bb
    Opis:
    Microstructure and corrosion resistance of the AE42 commercial alloy processed by extrusion and rotary swaging were investigated. Microstructure characterization showed an increasing volume fraction of the refined grains with increasing stage of swaging processing. However, their presence was limited solely to the peripheral ring of ≈1 mm in all studied conditions of swaged material. Corrosion resistance investigation showed continuous decrease of polarization resistance that was attributed to the grain refinement and insufficient homogenization of the alloying elements during the swaging process.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 4; 805-807
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Very High Cycle Fatigue Behaviour of Ti-6Al-4V Alloy
    Autorzy:
    Janeček, M.
    Nový, F.
    Harcuba, P.
    Stráský, J.
    Trško, L.
    Mhaede, M.
    Wagner, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402062.pdf
    Data publikacji:
    2015-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    46.50.+a
    62.20.M-
    81.40.Np
    Opis:
    The high cycle and very high cycle fatigue properties of the titanium alloy Ti-6Al-4V with a duplex microstructure were investigated at room temperature. High cycle fatigue tests were performed in the range from 10⁴ to 10⁷ cycles by rotating bending at the frequency of 30 Hz. The very high cycle fatigue tests were carried out in the range from 10⁷ to 10¹⁰ cycles in tension-compression on an ultrasonic fatigue testing machine at the frequency of 20 kHz. The stress amplitude was found to decrease with increasing number of cycles in the whole range from 10⁴ up to 10⁹ cycles and only at the highest number of cycles $(N_{F}=10^9)$ the alloy exhibits the fatigue limit of 460 MPa. The detail fractographic analysis was performed to characterize the fatigue failure mechanisms. Both subsurface and surface crack initiation were observed in very high cycle fatigue region. No inclusions, but only local chemical inhomogeneity in microstructure was observed at the locations of subsurface fatigue crack initiation in alpha-grains.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 4; 497-502
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Evidence of Quasi-Free Positronium State in GiPS-AMOC Spectra of Glycerol
    Autorzy:
    Zvezhinskiy, D.
    Butterling, M.
    Wagner, A.
    Krause-Rehberg, R.
    Stepanov, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1196485.pdf
    Data publikacji:
    2014-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.70.Bj
    82.30.Gg
    34.80.-i
    34.80.Lx
    Opis:
    We present the results of processing of age-momentum correlation spectra that were measured for glycerol by the gamma-induced positron spectroscopy facility. Our research has shown that the shape of experimental s(t) curve cannot be explained without introduction of the intermediate state of positronium (Ps), called quasi-free Ps. This state yields the wide Doppler line near zero lifetimes. We discuss the possible properties of this intermediate Ps state from the viewpoint of developed model. The amount of annihilation events produced by quasi-free Ps is estimated to be less than 5% of total annihilations. In the proposed model, quasi-free Ps serves as a precursor for trapped Ps of para- and ortho-states.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 3; 821-824
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Grain Refinement after Various Thermo-Mechanical Treatments in AZ80 and ZK60 Magnesium Alloys
    Autorzy:
    Ryspaev, T.
    Janecek, M.
    Minárik, P.
    Wesling, V.
    Wagner, L.
    Kral, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1419057.pdf
    Data publikacji:
    2012-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.40.Gh
    81.07.Bc
    Opis:
    The effect of thermal processing prior to severe plastic deformation by extrusion and swaging on grain refinement in ZK60 and AZ80 alloys was studied. The alloys received in direct-chill cast condition were homogenized at 415C and annealed (over-aged) at temperatures from 200 to 380°C. Both the direct-hill cast and over-aged conditions were extruded at T = 300C using an extrusion ratio of ER = 19. Hot extrusion resulted in substantial grain refinement in both cases, the effect being stronger in the over-aged material. The extruded bars were severe plastically deformed at 250C by swaging. Swaging refined further the grain size depending on the deformation ratio (number of passes). At optimal processing conditions the grain size was 450 nm and 570 nm for the AZ80 and ZK60 alloys, respectively.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 3; 622-624
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electroluminescence Investigation of the Lateral Field Distribution in AlGaN/GaN HEMTs for Power Applications
    Autorzy:
    Baeumler, M.
    Polyakov, V.
    Gütle, F.
    Dammann, M.
    Benkhelifa, F.
    Waltereit, P.
    Reiner, R.
    Müller, S.
    Wespel, M.
    Quay, R.
    Mikulla, M.
    Wagner, J.
    Ambacher, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1197910.pdf
    Data publikacji:
    2014-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.60.Fi
    85.30.De
    85.30.Tv
    85.40.Bh
    85.40.Qx
    73.40.-c
    73.90.+f
    73.61.Ey
    73.50.Mx
    Opis:
    The lifetime and stability of AlGaN/GaN heterostructure field effect transistors at high power levels can be enhanced by introducing field plates to reduce electric field peaks in the gate-drain region. Simulations of the electric field distribution along the channel using the 2D ATLAS software from Silvaco indicate that above a characteristic drain source voltage three spatially separated electric field peaks appear, one located at the drain-side edge of the gate foot, one at the end of the drain-sided gate field plate, and one at the end of the source shield field plate. The close correlation between lateral electric field and the electroluminescence due to hot electron related intra-band transitions can be very helpful when optimizing the electric field distribution in high power devices. Electroluminescence microscopy images of devices with gate and source shield field plate reveal the peaks located at the locations of enhanced electric field. By studying the voltage dependence of the electroluminescence peaks the influence of the field plates on the electric field distribution in source drain direction can be visualized.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 4; 982-985
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Special X-Ray Silicon Detectors for Medical Applications
    Autorzy:
    Halmagean, E.
    Wagner, D.
    Tsoi, E.
    Misiakos, K.
    Ohanisian, M.
    Veron, A.
    Cimpoca, V.
    Lazarovici, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1963381.pdf
    Data publikacji:
    1997-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    07.85.-m
    61.80.Cd
    Opis:
    The paper presents some results concerning the technology and behaviour of X-ray silicon detectors intended for controlling low radiation levels in interventional cardiology. An improved planar process was used for obtaining large area guard-ring test structures. The electrical characteristics, their modification after exposure to radiation and the results of spectroscopic X-ray measurements are discussed.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 4; 789-792
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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