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    Wyświetlanie 1-7 z 7
    Tytuł:
    Mechanical properties of Ni-Fe-Cu-P-B alloy produced by two component melt spinning (TCMS)
    Autorzy:
    Wojciechowska, M.
    Ziewiec, K.
    Kąc, S.
    Prusik, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/351728.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    metallic glasses
    scanning electron microscopy (SEM)
    nanoindentation
    transmission electron microscopy TEM
    mechanical properties
    Opis:
    The aim of this work was to investigate the microstructure and mechanical properties of the two-component melt-spun (TCMS) alloy produced from Ni40Fe40B20 and Ni70Cu10P20 melts. The Ni40Fe40B20, Ni70Cu10P20, Ni55 Fe20 Cu5 P10 B10 alloys were arc-melted. Then the alloys were melt-spun in the two different ways i.e.: by casting from a single-chamber crucible and from the two-chamber crucible. All of the above mentioned alloys were processed in the first way and the Ni40Fe40B20 and Ni70Cu10P20 were simultaneously cast on the copper roller from the two-chamber crucible. The microstructure of the alloy was studied using transmission electron microscopy (TEM), scanning electron microscopy (SEM) with energy dispersive spectrometry (EDS) and light microscopy. The mechanical properties were investigated using tensile testing and nanoindentation. The two-component melt-spun (TCMS) amorphous Ni55 Fe20 Cu5 P10 B10 alloy present hardness, tensile strength and Young modulus on the significantly higher level than for a single phase amorphous Ni55 Fe20 Cu5 P10 B10 alloy and slightly below the corresponding values for the Ni40Fe40B20.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 1; 137-140
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Biological and mechanical research of titanium implants covered with bactericidal coating
    Autorzy:
    Malisz, Klaudia
    Świeczko-Żurek, Beata
    Powiązania:
    https://bibliotekanauki.pl/articles/2172010.pdf
    Data publikacji:
    2022
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
    Tematy:
    nanometals
    scanning electron microscopy
    wettability
    nanoindentation
    antibacterial properties
    mechanical properties
    Opis:
    Materials used in bone implants should not only be non- -toxic to the surrounding tissues, but also should promote osseointegration and minimize the risk of infection. Infections are a serious problem contributing to implantation failure. They are associated with pain, immobilization, and the necessity of reoperation. In extreme cases, they can lead to significant inflammatory changes in the bones, which, in turn, can lead to amputation and even death. After implantation, the surrounding tissues are damaged. In addition, implants are susceptible to bacterial colonization due to the lack of microcirculation. Therefore, scientists are working on antibacterial coatings to prevent the adhesion of bacteria before tissue regeneration. The paper concerns the biological and mechanical properties of titanium implants with an antibacterial coating. The Ti13Zr13Nb alloy samples were coated with hydroxyapatite (HAp) coatings using the electrophoretic deposition technique (EPD). Subsequently, the surface of the samples was modified with silver, copper, and nickel nanoparticles by the immersion method. Different titanium sample types (i.e. HAp-only and nanometals-enriched coatings) were placed in a bacterial solution for a period of one month. Each sample was examined using scanning electron microscopy (SEM), nanoindentation, nanoscratch, and contact angle tests. The significant amount of dead biofilm on the surface proves the effectiveness of antibacterial activity. The wettability assessment showed that the samples were hydrophilic. The conducted tests of mechanical properties indicate the heterogeneity of the coatings.
    Źródło:
    Engineering of Biomaterials; 2022, 25, 165; 17--22
    1429-7248
    Pojawia się w:
    Engineering of Biomaterials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characterization of Microwave Sintered Aluminium Composite Reinforced with Hydroxyapatite Extracted from Rihu Fish Scales
    Autorzy:
    Venkatesh, V.S.S.
    Prasad, Kalapala
    Deoghare, Ashish B.
    Powiązania:
    https://bibliotekanauki.pl/articles/27765073.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    hydroxyapatite
    aluminium matrix
    microwave sintering
    mechanical properties
    Scanning Electron Microscopy
    Opis:
    In this study, Hydroxyapatite (HAp) is extracted from the Rihu fish scales which are generally dumped as garbage. The aluminium composite was fabricated through the powder metallurgy technique by reinforcing HAp (0, 5, 10 and 15 wt%) as a reinforcement. The fabricated samples were sintered through microwave sintering at 530℃ for 15 min under an argon gas environment. The fabricated composites were subjected to X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Energy Dispersive Spectroscopy (EDS) analysis to confirm the constituting elements and to describe the reinforcement dispersion in the matrix. Uniform reinforcement dispersion was observed for the composite reinforces with 5% HAp, 10% HAp particles. The mechanical characterization results reveal that the Al-10% HAp composite exhibits a microhardness value of 123 ± 3 Hv and maximum ultimate tensile strength of 263 ± 10 MPa and 299 ± 9 MPa compression strength was obtained due to the presence of a strong bond among the aluminium and HAp particles.
    Źródło:
    Archives of Metallurgy and Materials; 2023, 68, 2; 617--624
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Monotonic behaviour of typical Al-Cu-Mg alloy pre-strained at elevated temperature
    Autorzy:
    Tomczyk, A.
    Seweryn, A.
    Doroszko, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/281485.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    creep and tensile tests
    metals and alloys
    scanning electron microscopy
    numerical calculations
    mechanical properties
    Opis:
    This paper presents results of monotonic tensile and creep tests conducted on typical Al-Cu-Mg alloy (commercial 2024) specimens. Tensile tests carried out at room (20°C) and elevated (100°C, 200°C, 300°C) temperatures made it possible to determine strength properties of the material (Young’s modulus, yield stress, ultimate tensile strength). Creep tests were performed at elevated temperature (100°C, 200°C and 300°C) with a constant force. In order to obtain material creep characteristics, creep-rupture tests were carried out. Then creep tests were conducted with two different strain values: one corresponding to the beginning of the secondary creep and the other corresponding to a certain value of the tertiary creep. After preliminary creep deformation at two various strain levels, specimens were cooled at ambient temperature and then subjected to monotonic tensile tests. The characteristics of the material were obtained for pre-strained specimens at different temperatures. Specimens fracture surfaces obtained as a result of tensile (at elevated and room temperature), creep and combined tests were analyzed.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2018, 56, 4; 1055-1068
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructure and Mechanical Characteristics of the Ternary SnZnAl Lead-Free Alloy
    Autorzy:
    Pietrzak, K.
    Klasik, A.
    Maj, M.
    Sobczak, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/380398.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    lead free alloy
    microstructure
    mechanical properties
    scanning electron microscopy
    stop bezołowiowy
    mikrostruktura
    właściwości mechaniczne
    mikroskop skaningowy
    Opis:
    The paper describes the studies of ternary SnZn9Al1.5 lead-free alloy from the viewpoint of its mechanical behavior as well as microstructure examined by the light and scanning electron microscopy. The authors focused their attention specifically on the fatigue parameters determined by the original modified low-cycle fatigue method (MLCF), which in a quick and economically justified way allows determination of a number of mechanical parameters based on the measurement data coming from one test sample only. The effect of the addition of 1.5% Al to the binary eutectic SnZn9 alloy on its microstructure and the obtained level of mechanical parameters was analyzed. The phases and intermetallic compounds occurring in the alloy were identified based on the chemical analysis carried out in micro-areas by the SEM/EDS technique. It was shown that the addition of 1.5% Al to the binary eutectic SnZn9 alloy resulted in a more favorable microstructure and consequently had a positive effect on the mechanical parameters of the alloy. Based on the conducted research, it was recommended to use a combinatorial method based on the phase quanta theory to quickly evaluate the microstructure and the original MLCF method to determine a number of mechanical parameters.
    Źródło:
    Archives of Foundry Engineering; 2018, 18, 3; 31-36
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Właściwości mechaniczne i morfologia folii piezoelektrycznych na bazie kompozytów z polipropylenu
    Autorzy:
    Chylińska, M.
    Kaczmarek, H.
    Królikowski, B.
    Klimiec, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/277989.pdf
    Data publikacji:
    2017
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Inżynierii Materiałów Polimerowych i Barwników
    Tematy:
    materiały piezoelektryczne
    polipropylen
    właściwości mechaniczne
    skaningowa mikroskopia elektronowa
    piezoelectric materials
    polypropylene
    mechanical properties
    scanning electron microscopy
    Źródło:
    Przetwórstwo Tworzyw; 2017, T. 23, Nr 1 (175), 1 (175); 6
    1429-0472
    Pojawia się w:
    Przetwórstwo Tworzyw
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fabrication and characterization of composite materials based on porous ceramic preform infiltrated by elastomer
    Autorzy:
    Chabera, P.
    Boczkowska, A.
    Witek, A.
    Oziębło, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/202111.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ceramic matrix composites
    ceramic
    mechanical properties
    damage mechanics
    scanning electron microscopy
    kompozyty z matrycą ceramiczną
    ceramika
    właściwości mechaniczne
    mechanika szkód
    skaningowa mikroskopia elektronowa
    Opis:
    The paper presents the experimental results of fabrication and characterization of ceramic- elastomer composites. They were obtained using pressure infiltration of porous ceramics by elastomer As a result the composites in which two phases are interpenetrating three-dimensionally and topologically throughout the microstructure were obtained. In order to enhance mechanical properties of preforms a high isostatic pressure method was utilized. The obtained ceramic preforms with porosity gradient within the range of 20-40% as well as composites were characterized by X-ray tomography. The effect of volume fraction of pores on residual porosity of composites was examined. These results are in accordance with SEM images which show the microstructure of composites without any delaminations and voids. Such composites exhibit a high initial strength with the ability to sustain large deformations due to combining the ceramic stiffness and rubbery elasticity of elastomer. Static compression tests for the obtained composites were carried out and the energy dissipated during compression was calculated as the area under the stress-strain curve. The dynamic behavior of the composite was investigated using the split Hopkinson pressure bar technique. It was found that ceramic-elastomer composites effectively dissipate the energy. Moreover, a ballistic test was carried out using armor piercing bullets.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2015, 63, 1; 193-199
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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