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    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:
    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:
    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:
    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:
    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:
    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
    Tytuł:
    Positron annihilation lifetime spectroscopy study of roller burnished magnesium alloy
    Autorzy:
    Zaleski, R.
    Zaleski, K.
    Gorgol, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/146650.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    AZ91HP magnesium alloy
    defects
    positron lifetime annihilation spectroscopy (PALS)
    roller burnishing
    Vickers hardness test
    Opis:
    The effect of roller burnishing on Vickers’ hardness and positron lifetimes in the AZ91HP magnesium alloy was studied. The microhardness increases with an increase in the burnishing force and with a decrease in the feed. The comparison of various methods of analysis of positron annihilation lifetime (PAL) spectra allowed identification of two components, which are related to solute-vacancy complexes and vacancy clusters, respectively. It was found that the increase in microhardness was related to the increase in the concentration of vacancy clusters.
    Źródło:
    Nukleonika; 2015, 60, No. 4, part 1; 789-794
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Kształtowanie odlewniczego stopu magnezu AZ91 na tle prób wyciskania współbieżnego
    Forming of casting magnesium alloy AZ91 against direct extrusion
    Autorzy:
    Ziółkiewicz, S.
    Jankowski, Ł.
    Gronowski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/211556.pdf
    Data publikacji:
    2013
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Obróbki Plastycznej
    Tematy:
    stop magnezu AZ91
    wyciskanie współbieżne
    plastyczność
    magnesium alloy AZ91
    direct extrusion
    plasticity
    Opis:
    Stopy magnezu stają się coraz popularniejszym materiałem konstrukcyjnym wykorzystywanym w gospodarce. Przyczyną tego jest między innymi korzystny stosunek własności wytrzymałościowych do masy, wykorzystywany w przemyśle motoryzacyjnym oraz zdolności stopów magnezu do tłumienia zakłóceń o źródle elektromagnetycznym, co wykorzystywane jest w zaawansowanych technologiach teleinformatycznych. Najczęściej wykorzystuje się stopy odlewnicze z grupy AZ (Magnez-Aluminium-Cynk) i AM (Magnez-Aluminium-Mangan). Poszukuje się jednak nowych metod wytwarzania, które pozwalają na podniesienie własności użytkowych wyrobów. Taką technologią jest obróbka plastyczna, która poprzez zmianę formy wpływa znacząco na zmianę struktury, a tym samym na własności kształtowanych metali. W artykule podjęto problem przeróbki plastycznej trudno odkształcalnego stopu magnezu z grupy AZ. Celem prac było przeprowadzenie badań technologicznych możliwości odkształcalności stopu AZ91. Badania prowadzono na surowych wlewkach w procesie wyciskania współbieżnego prętów, w zakresie temperatur 280-360˚C, na stanowisku prasy hydraulicznej wyposażonej w specjalny przyrząd z układem grzewczym narzędzi. W artykule przedstawiono napotkane w trakcie realizacji badań wady w wytwarzanych prętach oraz metody poszukiwania rozwiązań optymalnego procesu technologicznego. W wyniku realizacji badań stwierdzono, że istotnym elementem procesu technologicznego jest stan wyjściowy wsadu. Wsad przed procesem wyciskania musi zostać poddany przesycaniu w celu rozpuszczenia się kruchej fazy γ-Mg17Al12. Stwierdzono również, że istnieje możliwość wyciskania współbieżnego do postaci prętów w bardzo wąskim zakresie temperatur 290±10˚C.
    Magnesium alloys are more and more popular constructional materials used in the economy. Among other things, reasons for that include an advantageous relation of mechanical properties to the mass, used in the automotive industry, and the abilities of magnesium alloys to suppress electromagnetic noises what is used in advanced tele-information technologies. The casting alloys included in the group AZ (Magnesium-Aluminium-Zinc) and AM (Magnesium-Aluminium-Manganese) are used most often. However, new manufacturing methods that allow to improve operational properties of products are searched for. Such a technology is a plastic forming that through a change of the form affects significantly the change of structure, therefore, the properties of formed metals. The article brings up a problem of plastic working of hard deformable magnesium alloy included in the group AZ. The purpose of theses researches was to perform technological tests of deformability capabilities of alloy AZ91. The tests were performed using raw ingots in the process of direct extrusion of the bars, within the range of temperatures of 280-360˚C, on a station of hydraulic press equipped with a special instrument with heating tool system. The article presents defects in manufactured bars, met during the realization of researches, and methods of searching for solutions of optimal technological process. As a result of the realization of researches, it is stated that an essential element of technological process is an initial state of charge. Prior to the extrusion process the charge must be subjected to solution heat treatment in order to dissolve a brittle phase γ-Mg17Al12. It is also stated that there is a possibility of direct extrusion to the form of bars within a very narrow range of temperatures of 290±10˚C.
    Źródło:
    Obróbka Plastyczna Metali; 2013, 24, 2; 109-117
    0867-2628
    Pojawia się w:
    Obróbka Plastyczna Metali
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Benefit Effect of Low Addition Yttrium on the Phase αMg and eutectic αMg+γ(Mg17Al12) in AZ91 Alloy
    Autorzy:
    Mikusek, D.
    Rapiejko, C.
    Andrzejczak, A.
    Pacyniak, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2049625.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    magnesium alloy AZ91
    yttrium
    grain refining
    solidification process
    investment casting
    Opis:
    This paper presents results of a study of the effect of inoculation of yttrium on the microstructure of AZ91 alloy. The concentration of the inoculant was increased in samples in the range from 0.1% up to 0.6%. The influence of Y on the thermal effects resulting from the phase transformations occurring during the crystallisation at different inoculant concentrations were examined with the use of Derivative and Thermal Analysis (DTA). The microstructures of the samples were examined with the use of an optical microscope; and an image analysis with a statistical analysis were also carried out. Those analyses aimed at examining oh the effect of inoculation of the Y on the differences between the grain diameters of phase αMg and eutectic αMg+γ(Mg17Al12) in the prepared examined material as well as the average size of each type of grain by way of measuring their perimeters.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 1; 57-63
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ocena odkształcenia granicznego stopu magnezu AZ91
    Assessment of limit deformation of AZ91 magnesium alloy
    Autorzy:
    Ziółkiewicz, S.
    Gąsiorkiewicz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/212029.pdf
    Data publikacji:
    2013
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Obróbki Plastycznej
    Tematy:
    stop magnezu AZ91
    metoda KOBO
    obróbka plastyczna
    magnesium alloy AZ91
    KOBO method
    plastic working
    Opis:
    W pracy przedstawiono wyniki badań wpływu procesu wyciskania ze zmienną drogą odkształcenia i procesu wyciskania współbieżnego na właściwości plastyczne stopu magnezu AZ91. Wyniki wskazują, że przetworzenie wlewka metodą KOBO w wąskim zakresie temperatury, może doprowadzić do cech nadplastycznych badanego stopu. W artykule przedstawiono wyniki badań prowadzonych w Instytucie Obróbki Plastycznej.
    This paper presents the results of research influence of extrusion on variable way of deformation AZ91 magnesium alloy. The results indicate that the corresponding processing of the ingot by KOBO extrusion method can lead investigated alloy to superplastic flow. This paper presents the results of a preliminary study.
    Źródło:
    Obróbka Plastyczna Metali; 2013, 24, 2; 99-107
    0867-2628
    Pojawia się w:
    Obróbka Plastyczna Metali
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Formation of Structure and Properties in Casting Processes on the Example of AZ91 Magnesium Alloy
    Autorzy:
    Augustyn, B.
    Szymanek, M.
    Kapinos, D.
    Boczkal, S.
    Korczak, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/383152.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    innovative foundry technologies
    innovative foundry materials
    magnesium alloy
    AZ91 alloy
    RS process
    mechanical properties
    innowacyjne technologie odlewnicze
    innowacyjne materiały odlewnicze
    stop magnezu
    stop AZ91
    właściwości mechaniczne
    Opis:
    Contemporary materials engineering requires the use of materials characterised by high mechanical properties, as these precisely properties determine the choice of material for parts of machinery and equipment. Owing to these properties it is possible to reduce the weight and, consequently, the consumption of both material and energy. Trying to meet these expectations, the designers are increasingly looking for solutions in the application of magnesium alloys as materials offering a very beneficial strength-to-weight ratio. However, besides alloying elements, the properties are to a great extent shaped by the solidification conditions and related structure. The process of structure formation depends on the choice of casting method forced by the specific properties of casting or by the specific intended use of final product. The article presents a comparison of AZ91 magnesium alloys processed by different casting technologies. A short characteristic was offered for materials processed by the traditional semi-continuous casting process, which uses the solidification rates comprised in a range of 5 - 20⁰C/s, and for materials made in the process of Rapid Solidification, where the solidification rate can reach 106⁰C/s. As a result of the casting process, a feedstock in the form of billets and thin strips was obtained and was subjected next to the process of plastic forming. The article presents the results of structural analysis of the final product. The mechanical properties of the ø7 mm extruded rods were also evaluated and compared.
    Źródło:
    Archives of Foundry Engineering; 2014, 14, 2; 43-48
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the Crystallization of AZ91 Alloy by Thermal and Derivative Analysis Method Intensively Cooled in Ceramic Shell
    Autorzy:
    Rapiejko, C.
    Pisarek, B.
    Czekaj, E.
    Pacyniak, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/380100.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    innovative casting materials
    innovative casting technology
    magnesium alloys
    TDA method
    hardness
    crystallization
    alloy AZ91
    innowacyjne materiały odlewnicze
    innowacyjna technologia odlewania
    metoda ATD
    krystalizacja
    stop AZ91
    Opis:
    The work presents the test result of the influence of cooling rate on the microstructure of AZ91 alloy, Vickers micro-hardness and Brinell hardness. Studies cooling and crystallization of AZ91 alloy was cast into the ceramic shells pre-heated to 180°C and then air-cooled at ambient temperature or intensively super cooled in the liquid coolant. The TDA method was applied to record and characterize the thermal effect resulting from the phase transformations occurring during the crystallization of AZ91 alloy. The kinetics and dynamics of the thermal processes of crystallization of AZ91 alloy in the ceramic shells were determined. Metallographic tests were performed with the use of an optical microscope. A comparison of these test results with the thermal effect recorded by way of the TDA method was made. Influence of cooling rate of AZ91 on HV0, 01 micro-hardness and Brinell hardness alloy was examined.
    Źródło:
    Archives of Foundry Engineering; 2014, 14, 1; 97-102
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Statistical analysis of SiC addition on heterogeneous nucleation of α-Mg primary phase in the AZ91/SiC composite
    Analiza statystyczna wpływu SiC na zarodkowanie fazy pierwotnej α-Mg w kompozycie AZ91/SiC
    Autorzy:
    Gracz, B.
    Lelito, J.
    Żak, P.
    Krajewski, W. K.
    Suchy, J. S.
    Szucki, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/264037.pdf
    Data publikacji:
    2010
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    kompozyt AZ91/SiC
    gęstość ziaren
    faza pierwotna alfa-Mg
    faza pierwotna α-Mg
    stop magnezu
    analiza statystyczna
    AZ91/SiC composite
    statistical analysis
    grain size distribution
    SiC particle
    magnesium alloy
    Opis:
    The aim of this research was to compare influence of different SiC mass fraction and different SiC particle size on the nucleation process of magnesium primary phase in AZ91/SiC composite. This paper presents experimental results using SiC particles as a reinforcement for AZ91 alloy and their influence on both the grain size of α-Mg primary phase and dimensional homogeneity of grains of this phase. This study provides a good basis for optimizing the process of preparing the AZ91/SiC composite.
    W artykule przedstawiono analizę statystyczną wyników badań dotyczących wpływu wielkości cząstek SiC oraz ich udziału, na wielkość ziaren fazy pierwotnej magnezu. Praca przedstawia, na przykładzie kompozytu AZ91/SiC, wpływ modyfikacji zarówno na rozmiar ziarna fazy pierwotnej, jak i jej jednorodność pod względem wielkości ziaren, dając tym samym podstawy do optymalizacji procesu przygotowywania kompozytu
    Źródło:
    Metallurgy and Foundry Engineering; 2010, 36, 2; 123-130
    1230-2325
    2300-8377
    Pojawia się w:
    Metallurgy and Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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