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    Wyświetlanie 1-8 z 8
    Tytuł:
    Investigation of Tribological and Mechanical Properties of Biodegradable AZ91 Alloy Produced by Cold Chamber High Pressure Casting Method
    Autorzy:
    Urtekin, Levent
    Arslan, Recep
    Bozkurt, Fatih
    Er, Ümit
    Powiązania:
    https://bibliotekanauki.pl/articles/2049430.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    die casting
    AZ91 magnesium alloy
    cold chamber high pressure casting method
    mechanical properties of AZ91 magnesium alloy
    wear of AZ91 alloy
    tribological properties of AZ91 alloy
    Opis:
    In this study, AZ91 Magnesium alloy is produced by cold chamber high pressure die casting (HPDC) method. Different combinations of the cold chamber HPDC process parameters were selected as; in-mold pressure values of 1000 bar and 1200 bar, the gate speed of 30 m/s and 45 m/s, the casting temperatures of 640°C and 680°C. In addition, the test samples were produced by conventional casting method. Tensile test, hardness test, dry sliding wear test and microstructure analysis of samples were performed. The mechanical properties of the samples produced by the cold chamber HPDC and the conventional casting method were compared. Using these parameters; the casting temperature 680°C, in-mold pressure 1000 bar and the gate speed 30 m/s, the highest tensile strength and the hardness value were obtained. Since the cooling rate in the conventional casting method is slower than that of the cold chamber HPDC method, high mechanical properties are obtained by the formation of a fine-grained structure in the cold chamber HPDC method. In dry sliding wear tests, it was observed that there was a decrease in friction coefficient and less material loss with the increase of hardness values of the sample produced by the cold chamber HPDC method.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 1; 205-216
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimization of Output Responses during EDM of AZ91 Magnesium Alloy using Grey Relational Analysis and TOPSIS
    Autorzy:
    Tajdeen, A.
    Megalingam, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2049133.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    AZ91 magnesium alloy
    EDM
    TOPSiS
    GRA
    ANOVA
    Opis:
    Unconventional machining of magnesium alloys through die sinking and Wire electrical discharge Machining (WEDM) processes are preferred over conventional machining processes to overcome the rapid loss in strength and affinity that occurs with tool materials at high temperatures. in the present study, AZ91 magnesium alloy is machined in EDM using a prepared alloy tool (copper alloyed with titanium diboride). Based on Taguchi’s l27 orthogonal array, a total of 27 experiments have been conducted by varying the process parameters such as pulse on time (Ton), gap voltage (Vg) and current (Ip) with three different levels. Techniques for Order Preference by Similarity to ideal Solution (TOPSIS) and Grey Relational Analysis (GRA) have been applied to optimize the response parameters of EDM to obtain maximum Material Removal Rate (MRR) and minimum Tool Wear Rate (TWR) and Surface Roughness (SR). Analysis of variance (ANOVA) is carried out based on F-test at a confidence interval of 95% to confirm the significant influence of individual parameters. From the above two optimization techniques, the obtained optimal values are current 15 A, gap voltage 55 V, pulse on time 30 μs and an error of less than 5% is observed from the confirmation experiments. Scanning Electron Microscope (SEM) images revealed that there is no formation of cracks but micro pits and holes are observed.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 4; 1105-1113
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Surface modification of AZ91 magnesium alloy using GTAW technology
    Autorzy:
    Iwaszko, J.
    Strzelecka, M.
    Kudła, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/201803.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    remelting treatment
    GTAW technology
    AZ91 magnesium alloy
    przetapianie
    technologia GTAW
    stop magnezu AZ91
    Opis:
    In this study, surface remelting treatment of the AZ91 magnesium alloy by means of welding using a non-consumable electrode in an inert gas shield was carried out. Three variants of surface treatment were used, i.e. the single torch variant with a single heat source without cooling down the samples, the single torch variant with a single heat source and a cooling system with liquid nitrogen, and the double welding torch variant with a double heat source in the torches operating in a tandem configuration. Experimental verification of the applied apparatus solutions was based on both macro- and microstructural assessment of the obtained effects. Comparative analysis of the variants used and the obtained microstructural results allowed the authors to indicate the deficiencies and limitations of particular solutions and to single out the best solution that would be useful for modifying the surface layers of magnesium alloys, as well as other materials having a strong oxygen affinity.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2017, 65, 6; 917-926
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High Temperature Mechanical Properties of AZ91 Magnesium Alloy Weld Joint
    Autorzy:
    Stopyra, M.
    Adamiec, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/382357.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    mechanical properties
    AZ91 magnesium alloy
    welding method
    właściwości mechaniczne
    stop magnezu AZ91
    metoda spawania
    Opis:
    Magnesium alloys are widely applied in aircraft and automotive industry, due to their low density and high specific strength. Welding methods can be used to join Mg alloy elements and to repair or regenerate defective or worn-out castings. Therefore the influence of weld joint’s microstructure on mechanical properties needs to be studied. In present paper high temperature mechanical properties of AZ91 Mg alloy weld joint was investigated. Tensile tests were conducted in temperature range between 20 and 200°C. Ultimate tensile strength decreased as the temperature increased from 50°C. At temperature up to 150°C rapture occurred in the base metal, at 200°C rupture location switched to the weld fusion zone. Based on metallographic and fractographic observation, the fracture mechanism was described. Macro crack formed from the merger of micro cracks occurring at massive β phase precipitates.
    Źródło:
    Archives of Foundry Engineering; 2013, 13, 1 spec.; 181-184
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Aluminosilcate glass cenospheres as a component of cast magnesium matrix composites
    Autorzy:
    Kamieniak, J.
    Żydek, A.
    Braszczyńska-Malik, K. N.
    Powiązania:
    https://bibliotekanauki.pl/articles/382002.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    AZ91 magnesium alloy
    aluminosilicate cenospheres
    metal matrix composite
    stop magnezu AZ91
    mikrosfera glinokrzemianowa
    kompozyt metalowy
    Opis:
    The main characteristic of aluminosilicate glass cenospheres and their possible use as a component of magnesium matrix composites were presented. The results revealed that particular parts of cenospheres differ insignificantly from each other and it depends on which power plant cenospheres come from. The characteristic of cenospheres concerned their structure and phase composition and dimensions such as: wall thickness and size of pores occurring in walls, depending on cenospheres origin. Thickness of cenospheres walls and pore size were measured by using ImageJ computer software. The structure of aluminosilicate glass cenospheres and their phase composition have been investigated by scanning electron microscopy and X-ray diffraction (XRD). The possibility of cenospheres utilization in the fabrication of magnesium matrix composites was presented on the example of AZ91 magnesium alloy composite with fly ash cenospheres. Composite was fabricated by pressure infiltration method.
    Źródło:
    Archives of Foundry Engineering; 2011, 11, 2 spec.; 109-112
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of process temperature on AZ91 matrix microstructure of composites with aluminosilicate glass cenospheres
    Autorzy:
    Kamieniak, J.
    Żydek, A.
    Braszczyńska-Malik, K. N.
    Powiązania:
    https://bibliotekanauki.pl/articles/380096.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    AZ91 magnesium alloy
    metal matrix composite
    glass cenosphere
    stop magnezu AZ91
    kompozyt metalowy
    cenosfera
    Opis:
    AZ91 magnesium alloy matrix composites with aluminosilicate glass cenospheres were fabricated successfully by the pressure infiltration method. Different parameters of the fabrication process, such as temperature of the mould and temperature of cenospheres were used. Influence of the temperature variation of particular parameters on the microstructure has been investigated. The microstructure of AZ91 magnesium alloy and fabricated composites have been investigated by light microscopy (LM) and scanning electron microscopy (SEM). The results revealed that AZ91 magnesium alloy consists of α-Mg matrix and eutectic α-Mg17Al12 and a small amount of discontinuous precipitates of γ phase. The microstructure of matrix AZ91 in fabricated composites is characterized also by the presence of α-Mg matrix and eutectic α-Mg17Al12. However, in the composite fabricated by using the mould heated to 500 °C more discontinuous precipitates of γ phase were observed.
    Źródło:
    Archives of Foundry Engineering; 2011, 11, 3 spec.; 107-110
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigations on the Microstructure and Corrosion Performance of Different WC-Based Cermet Coatings Deposited by High Velocity Oxy Fuel Process onto Magnesium Alloy Substrate
    Autorzy:
    Jonda, Ewa
    Łatka, Leszek
    Maciej, Artur
    Khozhanov, Aleksandr
    Powiązania:
    https://bibliotekanauki.pl/articles/2201928.pdf
    Data publikacji:
    2023
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    AZ91 magnesium alloy
    HVOF
    thermal spraying
    metal matrix composite coatings
    microstructure
    electrochemical corrosion
    Opis:
    In the field of surface engineering, thermal spraying is very wide adopted in many branches of the industry. The main reasons of such situation are its flexibility as well as cost effectiveness. Among others, High Velocity Oxy Fuel (HVOF) technique is dedicated for spraying hardmetal and cermet coatings, especially for wear- and corrosion resistance. Such type of coating could be a promising candidate as protective layer for magnesium alloys elements. These materials need a strong improvement in the corrosion protection as well as on the field of wear resistance in order to be widely used in the industry. In this work, different WC-based coatings, namely: (i) WC-Co, (ii) WC-Co-Cr and (iii) WC-Cr3C2-Ni manufactured by HVOF spraying, were investigated. The form of all feedstock materials was agglomerated and sintered powder. All coatings were sprayed with the same technological parameters, especially spray distance which was equal to 400 mm on the AZ91 magnesium alloy substrate. The main aim of the studies was to investigate the influence of the powder material on the corrosion resistance of obtained coatings. The manufactured coatings were examined in terms of its microstructure, using scanning electron microscope (SEM) and corrosion performance, which was assessed in the electrochemical corrosion investigations in 3.5% NaCl solution by Tafel method. The study showed that the corrosion resistance increasing in such order: AZ91 < WC-Cr3C2-Ni < WC-Co < WC-Co-Cr. It should be stressed that WC-Cr3C2-Ni coating exhibits very low corrosion performance, which could be effected by relatively high porosity (c.a. 3 vol.%) and because of that the more complex composition promotes creation of many corrosion cells.
    Źródło:
    Advances in Science and Technology. Research Journal; 2023, 17, 2; 25--35
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ocena możliwości kształtowania właściwości mechanicznych odlewniczego stopu magnezu AZ91 przez zastosowanie odpowiedniej obróbki cieplnej
    An assessment of the possibilities to shape the mechanical properties of cast AZ91 magnesium alloy through application of proper heat treatment
    Autorzy:
    Reguła, T.
    Bronicki, M.
    Lech-Grega, M.
    Czekaj, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/391628.pdf
    Data publikacji:
    2008
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Odlewnictwa
    Tematy:
    stop magnezu AZ91
    odlewanie
    obróbka cieplna
    właściwości mechaniczne
    AZ91 magnesium alloy
    casting
    heat treatment
    mechanical properties
    Opis:
    Celem publikacji jest ocena wpływu różnych sposobów klasycznej obróbki cieplnej na zmiany właściwości mechanicznych - w temperaturze pokojowej - stopu magnezowego typu AZ91, w odniesieniu do analogicznych charakterystyk dla stanu wyjściowego (lanego). Materiał badawczy odlewano grawitacyjnie do form piaskowych oraz kokil. Odpowiednio przygotowane mechanicznie próbki poddano obróbce cieplnej, podczas której doprowadzone zostały ze stanu wyjściowego (F - as-fabricated) do stanów: T4, T5 oraz T6. Badanie właściwości mechanicznych obejmowało wyznaczenie Rm, Rp02 i A5 w statycznych próbach rozciągania oraz pomiary twardości (HB) metodą Brinella. Wyniki badań wskazują, iż właściwości mechaniczne odlewniczego stopu AZ91 można w istotny sposób kształtować, poprzez zastosowanie odpowiedniej obróbki cieplnej.
    The aim of this publication is to assess the effect of different types of the standard heat treatment on changes in mechanical properties at room temperature of magnesium alloy from AZ91 family referred to the same properties in as-fabricated state. The investigated alloy was gravity cast into sand and metal moulds. The mechanically prepared specimens were subjected to a heat treatment during which they were transformed from the as-fabricated state to conditions: T4, T5 and T6. Testing of mechanical properties included determination of Rm, Rp02 and A5 during static tensile test and Brinell hardness measurements (HB). The results of the investigations indicate that the mechanical properties of cast AZ91 alloy can be successfully shaped through the application of proper heat treatment.
    Źródło:
    Prace Instytutu Odlewnictwa; 2008, 48, 1; 41-47
    1899-2439
    Pojawia się w:
    Prace Instytutu Odlewnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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