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    Wyświetlanie 1-6 z 6
    Tytuł:
    Influence of High-Temperature Oxidizing Conditions on AlCoCrCuNi High Entropy Alloys with and without Silicon Addition
    Autorzy:
    Gawel, R.
    Rogal, Ł.
    Przybylski, K.
    Matsuda, Kenji
    Powiązania:
    https://bibliotekanauki.pl/articles/2106569.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    high entropy alloy
    high temperature oxidation
    phase analysis
    alloying element
    Opis:
    Initial investigations on oxidation behaviour and phase transformations of equimolar AlCoCrCuNi high entropy alloy with and without 1 at.% silicon addition during 24-hr exposure to air atmosphere at 1273 K was carried out in this work. After determining the oxidation kinetics of the samples by means of thermogravimetric analysis, the morphology, chemical and phase compositions of the oxidized alloys were determined by means of scanning electron microscopy, energy dispersive X-ray spectroscopy and X-ray diffraction analysis. Additional cross-section studies were performed using transmission electron microscopy combined with energy dispersive X-ray spectroscopy and selected area electron diffraction. From all these investigations, it can be concluded that minor silicon addition improves the oxidation kinetics and hinders the formation of an additional FCC structure near the surface of the material.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 2; 471--478
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Corrosion and Stress Corrosion Cracking of New Wrought Magnesium Alloys
    Autorzy:
    Ben-Hamu, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/115827.pdf
    Data publikacji:
    2010
    Wydawca:
    Fundacja na Rzecz Młodych Naukowców
    Tematy:
    Magnesium Alloy
    Die Cast
    Hot Extrusion
    Alloying Element
    Electrochemical Techniques
    Opis:
    New magnesium alloys (Die-Cast and wrought) have increasingly been developed in recent years for the automotive industry due to their high potential as structural materials for low density and high strength/weight ratio demands. However, their poor mechanical properties and low corrosion resistance have led to a search for new kinds of magnesium alloys with better strength, ductility, high temperature behaviour and high corrosion resistance. The main objective of this research is to investigate the corrosion behaviour of new magnesium alloys: Mg-Al-Ca, Mg-Al-Sr, Mg-Zn-Mn-Si (ZSM) and Mg-Zn-Mn-Si-Ca (ZSMX). These ZSM6X1 and ZSM651+YCa alloys were prepared using hot extrusion. These Mg-Al-Ca and Mg-Al-Sr were prepared using high pressure die cast. AC and DC polarization tests were carried out on the new alloys. Microstructure was examined using optical and electron microscopy (SEM) and EDS. The addition of Si increased the corrosion resistance. The additions of Sr and Ca also aff ected the corrosion behaviour. These results can be explained by the eff ects of alloying elements on the microstructure of Mg alloys such as grain size and precipitates caused by the change in precipitation and recrystallisation behaviour.
    Źródło:
    Challenges of Modern Technology; 2010, 1, 1; 79-87
    2082-2863
    2353-4419
    Pojawia się w:
    Challenges of Modern Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of Artificial Neural Network to Predict the Tensile Properties of Dual-Phase Steels
    Autorzy:
    Shin, Seung-Hyeok
    Kim, Sang-Gyu
    Hwang, Byoungchul
    Powiązania:
    https://bibliotekanauki.pl/articles/2049252.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    artificial neural network
    ANN
    dual-phase steels
    alloying element
    microstructural factor
    tensile properties
    Opis:
    An artificial neural network (ANN) model was developed to predict the tensile properties of dual-phase steels in terms of alloying elements and microstructural factors. The developed ANN model was confirmed to be more reasonable than the multiple linear regression model to predict the tensile properties. In addition, the 3D contour maps and an average index of the relative importance calculated by the developed ANN model, demonstrated the importance of controlling microstructural factors to achieve the required tensile properties of the dual-phase steels. The ANN model is expected to be useful in understanding the complex relationship between alloying elements, microstructural factors, and tensile properties in dual-phase steels.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 3; 719-723
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hardness, corrosion behavior, and microstructure of Al-Cu-Mg alloy as a function of 0.3 wt.% Zr addition
    Autorzy:
    Saad, Karrar
    Al-Murshdy, Jassim M. Salman
    Powiązania:
    https://bibliotekanauki.pl/articles/2174477.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
    Tematy:
    Al-alloy
    effect of alloying element addition
    Brinell hardness
    current density
    recrystallization
    stop aluminium
    twardość Brinella
    gęstość prądu
    rekrystalizacja
    Opis:
    The effect of adding zirconium (Zr) as an alloying element to Al-Cu-Mg alloy on the hardness and corrosion of this alloy was investigated. The hardness and polarization test results of samples treated for various periods by aging at 423.15 K for 3hr showed a significant increment in the Brinell hardness (HBW) improvement ratio of 115.6% (from 45HBW to 97HBW) and an extreme reduction the corrosion rate of the alloy after Zr adding decrease in the current density by 79.42% (from 56.50 µA cm-2 to 11.63 µA cm-2) with aging for 3 hr compared to the base alloy. The impact of this addition is also reflected in the strengthening, recrystallization, and modification of the grain microstructure. These changes were clearly demonstrated by microscopic testing and proves that the addition of Zr has a considerable synergistic effect causing inhibition of recrystallization and refinement of grain size.
    Źródło:
    Diagnostyka; 2023, 24, 1; art. no. 2023104
    1641-6414
    2449-5220
    Pojawia się w:
    Diagnostyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis of Mg-based alloys with rare-earth element addition by means of mechanical alloying
    Autorzy:
    Lesz, Sabina
    Hrapkowicz, Bartłomiej
    Gołombek, Klaudiusz
    Karolus, Małgorzata
    Janiak, Patrycja
    Powiązania:
    https://bibliotekanauki.pl/articles/2086887.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    mechanical alloying
    magnesium
    rare-earth element
    ytterbium
    stopowanie mechaniczne
    magnez
    pierwiastek ziem rzadkich
    iterb
    Opis:
    Magnesium-based alloys are widely used in the construction, automotive, aviation and medical industries. There are many parameters that can be modified during their synthesis in order to obtain an alloy with the desired microstructure and advantageous properties. Modifications to the chemical composition and parameters of the synthesis process are of key importance. In this work, an Mg-based alloy with a rare-earth element addition was synthesized by means of mechanical alloying (MA). The aim of this work was to study the effect of milling times on the Mg-based alloy with a rare-earth addition on its structure and microhardness. A powder mixture of pure elements was milled in a SPEX 8000D high energy shaker ball mill under an argon atmosphere using a stainless steel container and balls. The sample was mechanically alloyed at the following milling times: 3, 5, 8 and 13 h, with 0.5 h interruptions. The microstructure and hardness of samples were investigated. The Mg-based powder alloy was examined by means of X-ray diffraction (XRD), scanning electron microscopy (SEM) and using a Vickers microhardness test. The results showed that microhardness of the sample milled for 13 h was higher than that of those with milling time of 3, 5 and 8 h.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 5; e137586, 1--7
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental and numerical small punch tests of the 14cr ods ferritic steel
    Autorzy:
    Nowik, Krzysztof
    Oksiuta, Zbigniew
    Powiązania:
    https://bibliotekanauki.pl/articles/2105990.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    ODS ferritic steel
    mechanical alloying
    small punch testing
    finite element method
    FEM
    yield stress
    ultimate tensile strength
    Opis:
    Nowadays, various small specimen test techniques have gained wide popularity and appreciation among researchers as they offer undoubtful benefits in terms of structural material characterisation. This paper focuses on small punch tests (SPTs) performed on small-sized disc specimens to assess the mechanical properties of 14Cr oxide dispersion strengthened (ODS) steel. A numerical model was established to support experimental data and gain deeper insight into complex strain states developing in a deformed specimen. Modern evaluation procedures were discussed for obtaining mechanical properties from the small punch force-deflection response and were compared with the literature. Applicability and universality of those relations at different test conditions were also studied. It appeared that different ball diameters used had negligible influence on yield point but strongly affected ultimate strength estimation. It was found that friction belongs to decisive factors determining strain distribution in samples, as dry conditions increase the peak strain and move its location farther from the punch pole.
    Źródło:
    Acta Mechanica et Automatica; 2022, 16, 3; 225--232
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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