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    Wyświetlanie 1-5 z 5
    Tytuł:
    Effect of friction stir processing (FSP) on microstructure and hardness of AlMg10/SiC composite
    Autorzy:
    Iwaszko, J.
    Kudła, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/200735.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    friction stir processing
    AlMg10/SiC composite
    microstructure
    kompozyt AlMg10/SiC
    mikrostruktura
    FSP
    Opis:
    The AlMg10 aluminum alloy reinforced with SiC particles was subjected to friction stir processing (FSP). The composite was made by mechanical mixing and gravity casting. The mass fraction of SiC particles in the composite was about 10%. Evaluation of the effects of FSP treatment was performed by means of light microscopy, scanning electron microscopy, EDS and hardness measurement. It was found that the inhomogeneous distribution of SiC particles and their agglomeration, which were observable in the cast composite, were completely eliminated after FSP modification. The treatment was also accompanied by homogenisation of the material in the mixing zone as well as fragmentation of both the matrix grain of the composite and SiC particles. In the case of SiC particles, a change in their shape was also observed. In the as-cast composite, particles with dimensions from 30 to 60 μm and a sharp-edged polyhedral shape prevailed, while in the material subjected to friction treatment, particles with dimensions from 20 to 40 μm and a more equiangular shape prevailed. Pores and other material discontinuities occurring frequently in the as-cast composite were completely eliminated after friction modification. The recorded changes in the microstructure of the material were accompanied by an increase in the hardness of the composite by nearly 35%. The conducted investigations have shown that FSP modification of the AlMg10/SiC composite made by the casting method leads to favorable microstructural changes in the surface layer and may be an alternative solution to other methods and technologies used in surface engineering.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2019, 67, 2; 185-192
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Surface modification of ZrO2-10 wt. % CaO plasma sprayed coating
    Autorzy:
    Iwaszko, J.
    Kudła, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/200857.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    remelting treatment
    GTAW method
    oxide coating
    przetapianie
    metoda TIG
    powłoka tlenkowa
    GTAW
    Opis:
    Oxide ZrO2-CaO plasma-sprayed coatings were remelted using the modified gas tungsten arc welding (GTAW) method. The original two-burner set, generating a free independent arc, was used in the treatment. The samples were subjected to structural examination using light and scanning electron microscopes, and energy-dispersive X-ray microanalysis (EDX). A substantial heterogeneity of the plasma-sprayed coatings was found, observable with a laminar structure, significant porosity, and step change in the concentration of the elements. Significant changes in the structure were found after the remelting treatment. Both microscopic and EDX investigations showed that the treatment leads to a reduction in the heterogeneity of the chemical composition of the coating material and to a loss of structural characteristics typical for plasma-sprayed coatings.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2016, 64, 4; 937-942
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characterization of Cu/SiC surface composite produced by friction stir processing
    Autorzy:
    Iwaszko, J.
    Kudła, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/202068.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    copper
    metal matrix surface composite
    friction stir processing
    Opis:
    The main aim of this work was to obtain a copper matrix surface composite using friction stir processing (FSP). The reinforced phase was SiC particles with an average size of 5 mm. The effect of the reinforcement on the microstructure, hardness and wear behaviour were analysed. The friction treatment was carried out using a truncated cone-shaped tool with a threaded side surface. Multi-chamber technology was used to produce the composite microstructure in the copper surface layer. Changes in the material microstructure were assessed by light microscopy and scanning electron microscopy. Comparative measurement of the hardness of the initial and treated material as well as wear resistance tests were also carried out. A favourable effect of the surface treatment on the microstructure and properties of the copper was found. As a result of the friction treatment there was strong grain refinement in the copper surface layer. The average grain size in the stirring zone was about 3 mm and was over 21 times smaller than the average grain size in the initial material. Intensive dispersion of the SiC particles in the modified layer was also found, leading to the formation of a copper matrix composite. The effect of microstructural changes in the surface layer of the material and formation of the surface composite was an over two-fold increase in the hardness of the material and an increase in wear resistance.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 3; 555-564
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Technological aspects of friction stir processing of AlZn5.5MgCu aluminum alloy
    Autorzy:
    Iwaszko, J.
    Kudła, K.
    Fila, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/201513.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    FSP technology
    AlZn5.5MgCu aluminium alloy
    technologia FSP
    stop aluminium AlZn5.5MgCu
    Opis:
    FSP technology was used to modify the surface layer of the AlZn5.5.MgCu aluminum alloy by enriching its SiC particles. For this goal the FSP multi-chamber method was used. The SiC powder was placed in separated chambers hollowed in the modified material perpendicular to the surface of the sample. In order to achieve a more even distribution of the reinforcing phase in the aluminum alloy matrix and to minimize the risk of uncontrolled displacement of the SiC powder at the time of inserting the pin into the material, a two-step treatment was applied. In the first one, the working area of the pin was shifted relative to the axis of the chambers by ΔL. In the second step of the treatment the tool moved centrally along the line of chambers. As a result of friction treatment, intensive sputtering of SiC particles in the surface of the aluminum alloy and strong refinement of the alloy were observed. The consequence of the microstructural changes in the surface layer of the material and the formation of a metal-ceramic composite microstructure was a significant increase in the hardness of the aluminum alloy.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2018, 66, 5; 713-719
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    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
      Wyświetlanie 1-5 z 5

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