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    Wyświetlanie 1-3 z 3
    Tytuł:
    The Effect of Non-Equilibrium Solidification on the Structure and Mechanical Properties of AZ91 Alloy
    Autorzy:
    Dziadoń, A.
    Bucki, T.
    Porzucek, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/382457.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    AZ91 alloy
    microstructure
    mechanical properties
    heat treatment
    Stop AZ91
    mikrostruktura
    właściwości mechaniczne
    obróbka cieplna
    Opis:
    AZ91 alloy was cast in a steel mould pre-exposed to three different temperatures: -196 ºC, 20 ºC and 650 ºC. The aim of the study was to determine the difference in the microstructure and mechanical properties between the castings formed in a cold mould and those solidifying under near-equilibrium conditions in a mould pre-heated to 650 ºC. Solidification at a low temperature led to dispersion of the structure elements as well as supersaturation of the solid solution of aluminium in magnesium. The heat treatment results indicate that the alloy solidified in the mould pre-exposed to 20 ºC can be successfully aged (heat treated to the T5 temper). It was found that the effect of the ageing process (T5 temper) was greater than the effect of the microstructure fragmentation, which was due to rapid solidification. The ageing results were assessed by comparing the microstructure and mechanical properties of AZ91 brought to the T5 condition with those obtained for the material in the T6 condition.
    Źródło:
    Archives of Foundry Engineering; 2018, 18, 3; 120-125
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure and Mechanical Properties of the CO2 Laser Welded Joint of AZ91 Cast
    Autorzy:
    Dziadoń, A.
    Musiał, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/947599.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    AZ91 alloy
    laser welding
    porosity
    microstructure
    mechanical properties
    stop AZ91
    spawanie laserowe
    porowatość
    mikrostruktura
    właściwości mechaniczne
    Opis:
    Plates of AZ91 cast magnesium alloy with a thickness of 3.5 mm were butt-welded using a laser power of 2000 W and helium as the shielding gas. The effect of the welding speed on the weld cross-sectional geometry and porosity was determined by microscopic analysis. It was found that to avoid the formation of macropores, welding should be carried out at a speed of 3.4 m/min or higher. Non-equilibrium solidification of the laser-melted metal causes fragmentation of the weld microstructure. Joints that were welded at optimal laser processing parameters were subjected to structural observations using optical and scanning microscopy and to mechanical tests. The mechanical properties were determined through Vickers hardness measurements in the joint cross-section and through tensile testing. The results indicate that the hardness in the fusion zone was about 20 HV (30%) higher than that of the base material. The weld proved to be a mechanically stable part of the joint; all the tensile-tested specimens fractured outside the fusion zone.
    Źródło:
    Archives of Foundry Engineering; 2020, 20, 3; 9-14
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    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
      Wyświetlanie 1-3 z 3

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