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    Wyświetlanie 1-4 z 4
    Tytuł:
    The Role of Microstructure on the Corrosion Behaviour of as cast AlCu4MgSi and MgAl2Si Alloys
    Autorzy:
    Lachowicz, M. M.
    Jasionowski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/381379.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    metallography
    corrosion resistance
    aluminum alloy
    magnesium alloy
    Al-Cu-Mg-Si alloy
    Mg-Al-Si alloy
    metalografia
    odporność korozyjna
    stop aluminium
    stop magnezu
    stop Al-Cu-Mg-Si
    stop Mg-Al-Si
    Opis:
    In this work, the effect of the microstructure on corrosion behavior of selected Mg- and Al-based as cast alloys, was evaluated. The electrochemical examinations were carried out, and then a morphology of corrosion products formed due to local polarization on materials surface, was analyzed. It was documented that the presence of Mg2Si phase plays an important role in the corrosion course of Mg-based alloy. A selective etching was observed in sites of Mg2Si precipitates having “Chinese script”- like morphology. Analogous situation was found for Al-based alloy, where the key role was played by cathodic θ-CuAl2 phase.
    Źródło:
    Archives of Foundry Engineering; 2018, 18, 2; 125-130
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Properties of 7xxx Series Alloys Formed by Alloying Additions
    Autorzy:
    Kwak, Z.
    Rzadkosz, S.
    Garbacz-Klempka, A.
    Perek-Nowak, M.
    Krok, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/382838.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    variation of the properties
    quality of ingots
    Al-Zn-Mg-Cu alloy
    microstructure
    jakość wlewków
    stop Al-Zn-Mg-Cu
    mikrostruktura
    Opis:
    Currently there is a constant development in the field of aluminium alloys engineering. This results from, i.a., better understanding of the mechanisms that direct strengthening of these alloys and the role of microalloying. Now it is microalloying in aluminum alloys that is receiving a lot of attention. It affects substantially the macro- and microstructure and kinetics of phase transformation influencing the properties during production and its exploitation. 7xxx series aluminum alloys, based on the Al-Zn-Mg-Cu system, are high-strength alloys, moreover, the presence of Zr and Sr further increases their strength and improves resistance to cracking. This study aims to present the changes of the properties, depending on the alloy chemical composition and the macro- and microstructure. Therefore, the characteristics in the field of hardness, tensile strength, yield strength and elongation are shown on selected examples. Observations were made on ingot samples obtained by semi-continuous casting, in the homogenized state. Samples were prepared from aluminum alloys in accordance with PN-EN 573-3: 2013. The advantage of Al-Zn-Mg-Cu alloys are undoubtedly good strength, Light-weight and resistance to corrosion. As widening of the already published studies it is sought to demonstrate the repeatability of the physical parameters in the whole volume of the sample.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 2; 59-64
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Crystal Segregation During Casting of the Alloy AlZn5.5Mg2.5Cu1.5
    Autorzy:
    Weiss, V.
    Svobodova, J.
    Cais, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/382136.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    theory of crystallization
    heat treatment
    homogenizing annealing
    crystal segregation
    alloy Al-Zn-Mg-Cu
    krystalizacja
    obróbka cieplna
    wyżarzanie
    stop Al-Zn-Mg-Cu
    Opis:
    In the course of homogenizing annealing of aluminium alloys being cast continually or semi-continually it appears that chemical inhomogenity takes off within separate dendritic cells (crystal segregation). It is about a diffusion process that takes place at the temperature which approaches the liquid temperature of the material. In that process the transition of soluble intermetallic compounds and eutectic to solid solution occurs and it suppresses crystal segregation significantly [1]. The temperature, homogenization time, the size of dendritic cells and diffusion length influences homogenizing process. The article explores the optimization of homogenizing process in terms of its time and homogenizing annealing temperature which influence mechanical properties of AlZn5,5Mg2,5Cu1,5 alloy.
    Źródło:
    Archives of Foundry Engineering; 2014, 14, 2; 63-68
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of the Influence of Additions on the Formation of Microstructure of Al-Zn-Mg-Cu Alloys
    Autorzy:
    Pisarek, B. P.
    Czekaj, E.
    Pacyniak, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/381528.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    innovative casting material
    innovative casting technology
    Al-Zn-Mg-Cu alloy
    TDA method
    hardness HB
    innowacyjny materiał odlewniczy
    innowacyjna technologia odlewnicza
    stop Al-Zn-Mg-Cu
    metoda ATD
    Opis:
    The article presents the investigations of 7xxx aluminium alloys performed by the method of thermal and derivational analysis. The studies made it possible to identify the effect of the changes in the Cu concentration, the total Zn and Mg weight concentrations and the Zn/Mg weight concentration ratio on their crystallization process: the cooling as well as the kinetics and dynamics of the thermal process of cooling and crystallization. Metallographic studies were performed on the microstructure of the examined alloys and their HB hardness was measured. The evaluation of the changes was presented in reference to the model alloys EN AW-7003 and EN AW-7010, whose microstructure under the conditions of thermodynamic equilibrium are described by the phase diagrams: Al-Zn-Mg and Al-Zn-Mg-Cu. The performed investigations confirmed that the hardness HB of the examined alloys is mainly determined by the reinforcement of the matrix αAl by the introduced alloy additions and the presence of phases Θ(Al2Cu) and S(Al2CuMg) rich in copper, as well as η(MgZn2), in the examined alloys' microstructure. The increase of the amount of intermetallic phases precipitated in the microstructure of the examined alloys is caused, beside Cu, by the characteristic change of Zn wt. concentration and Mg. It was proposed that the process of one-stage thermal treatment of the examined alloys be introduced at a temperature of up to tJ-20 °C, which will prevent the exceedance of the solidus temperature.
    Źródło:
    Archives of Foundry Engineering; 2018, 18, 4; 39-44
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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