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    Wyświetlanie 1-6 z 6
    Tytuł:
    The Properties of Al/Zn-enriched Surface Layers on Mg
    Autorzy:
    Mola, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/381256.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    magnesium
    surface modification
    intermetallic phases
    microstructure
    corrosion resistance
    wear resistance
    magnez
    modyfikacja powierzchni
    faza międzymetaliczna
    mikrostruktura
    odporność na korozję
    odporność na zużycie
    Opis:
    The Al/Zn-enriched surface layers were fabricated on Mg substrate by heating the specimens in contact with an Al + 40 wt.% Zn powder mixture at 445oC for 60 min. The microstructure and corrosion and wear resistance of the layers were investigated and discussed. The experimental results show that the layers were composed of Mg17(Al,Zn)12 and Mg5Al2Zn2 intermetallic phases and a solid solution of Al and Zn in Mg. They were integrated with the substrate trough a zone of a solid solution of Al and Zn in Mg. The potentiodynamic polarization measurements indicated that the specimens with Al/Zn-enriched layer had better corrosion resistance than the bare Mg. The microhardness of the layers containing Mg-Al-Zn intermetallic phases was much higher than that of the Mg substrate. The sliding wear tests showed that the wear resistance of the specimens with a surface layer containing intermetallic phases was also superior to that of untreated Mg.
    Źródło:
    Archives of Foundry Engineering; 2014, 14, 3 spec.; 45-48
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Microstructure and Properties of the Bimetallic AZ91/AlSi17 Joint Produced by Compound Casting
    Autorzy:
    Mola, R.
    Bucki, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/381472.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    innovative foundry technologies
    innovative foundry materials
    casting process
    microstructure
    mechanical properties
    innowacyjne technologie odlewnicze
    innowacyjne materiały odlewnicze
    proces odlewania
    mikrostruktura
    właściwości mechaniczne
    Opis:
    Bimetallic AZ91/AlSi17 samples were produced by compound casting. The casting process involved pouring the AZ91 magnesium alloy heated to 650ºC onto a solid AlSi17 aluminum alloy insert placed in a steel mould. Prior to casting, the mould with the insert inside was heated to about 370ºC. The bonding zone formed between AZ91 and AlSi17 had a thickness of about 200 μm; it was characterized by a non-homogeneous microstructure. Two different areas were distinguished in this zone: the area adjacent to the AZ91 and the area close to the AlSi17. In the area closest to the AZ91 alloy, a eutectic composed of an Mg17Al12 intermetallic phase and a solid solution of Al in Mg was observed. In bonding zone at a certain distance from the AZ91 alloy an Mg2Si phase co-occurred with the eutectic. In the area adjacent to the AlSi17 alloy, the structure consisted of Al3Mg2, Mg17Al12 and Mg2Si. The fine Mg2Si phase particles were distributed over the entire Mg-Al intermetallic phase matrix. The microhardness of the bonding zone was much higher than those of the materials joined; the microhardness values were in the range 203-298 HV. The shear strength of the AZ91/AlSi17 joint varied from 32.5 to 36 MPa.
    Źródło:
    Archives of Foundry Engineering; 2018, 18, 1; 71-76
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microscopic Analysis of Layers Containing Mg2Si and Mg17Al12 Phases Fabricated on AZ91 Through Thermochemical Treatment
    Autorzy:
    Mola, R.
    Cieślik, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/380750.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    surface treatment
    magnesium alloy
    modified surface layer
    microstructure
    obróbka powierzchniowa
    stop magnezu
    warstwa powierzchniowa zmodyfikowana
    mikrostruktura
    Opis:
    The thermochemical treatment applied to improve the surface properties of AZ91 consisted in heating the material in contact with AlSi10Mg powder at 445 oC for 30 min. During heat treatment process the powder was held under pressure to facilitate the diffusion of the alloying elements to the substrate and, accordingly, the formation of a modified layer. Two pressures, 1 MPa and 5 MPa, were tested. The resultant layers, containing hard Mg2Si and Mg17Al12 phases, were examined using an optical microscope and a scanning electron microscope equipped with an energy-dispersive X-ray spectrometer (EDS). The experimental data show that the layer microstructure was dependent on the pressure applied. A thicker, three-zone layer (about 200 μm) was obtained at 1 MPa. At the top, there were Mg2Si phase particles distributed over the Mg17Al12 intermetallic phase matrix. The next zone was a eutectic (Mg17Al12 and a solid solution of Al in Mg) with Mg2Si phase particles embedded in it. Finally, the area closest to the AZ91 substrate was a eutectic not including the Mg2Si phase particles. By contrast, the layer produced at a pressure of 5 MPa had lower thickness of approx. 150 μm and a two-zone structure. Mg2Si phase particles were present in both zones. In the upper zone, Mg2Si phase particles were regularly distributed over the Mg17Al12 intermetallic phase matrix. The lower zone, adjacent to the AZ91, was characterized by a higher volume fraction of Mg2Si phase particles distributed over the matrix composed mainly of Mg17Al12. The alloyed layers enriched with Al and Si had much higher hardness than the AZ91 substrate.
    Źródło:
    Archives of Foundry Engineering; 2019, 3; 119-124
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructure of the Bonding Zone Between AZ91 and AlSi17 Formed by Compound Casting
    Autorzy:
    Mola, R.
    Bucki, T.
    Dziadoń, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/379744.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    casting process
    joining
    magnesium alloys
    aluminum alloys
    intermetallic phases
    microstructure
    proces odlewania
    łączenie
    stop magnezu
    stop aluminium
    faza intermetaliczna
    mikrostruktura
    Opis:
    This paper discusses the joining of AZ91 magnesium alloy with AlSi17 aluminium alloy by compound casting. Molten AZ91 was cast at 650oC onto a solid AlSi17 insert placed in a steel mould under normal atmospheric conditions. Before casting, the mould with the insert inside was heated up to about 370oC. The bonding zone forming between the two alloys as a result of diffusion had a multiphase structure and a thickness of about 200 μm. The microstructure and composition of the bonding zone were analysed using optical microscopy, scanning electron microscopy and energy dispersive X-ray spectroscopy. The results indicate that the bonding zone adjacent to the AlSi17 alloy was composed of an Al3Mg2 intermetallic phase with not fully consumed primary Si particles, surrounded by a rim of an Mg2Si intermetallic phase and fine Mg2Si particles. The bonding zone near the AZ91 alloy was composed of a eutectic (an Mg17Al12 intermetallic phase and a solid solution of Al and Si in Mg). It was also found that the compound casting process slightly affected the AZ91alloy microstructure; a thin layer adjacent to the bonding zone of the alloy was enriched with aluminium.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 1; 202-206
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characterization of Coatings on Grey Cast Iron Fabricated by Hot-dipping in Pure Al, AlSi11 and AlTi5 Alloys
    Autorzy:
    Mola, R.
    Bucki, T.
    Wcisło, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/381108.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    hot-dip aluminizing
    coatings
    grey cast iron
    intermetallic phases
    microstructure
    powłoki
    żeliwo szare
    mikrostruktura
    Opis:
    Flake graphite cast iron was hot-dip coated with pure aluminium or aluminium alloys (AlSi11 and AlTi5). The study aimed at determining the influence of bath composition on the thickness, microstructure and phase composition of the coatings. The analysis was conducted by means of an optical microscope and a scanning electron microscope with an EDS spectrometer. It was found that the overall thickness of a coating was greatly dependent on the chemical composition of a bath. The coatings consisted of an outer layer and an inner intermetallic layer, the latter with two zones and dispersed graphite. In all the cases considered, the zone in the inner intermetallic layer adjacent to the cast iron substrate contained the Al5Fe2 phase with small amount of silicon; the interface between this phase and the cast iron substrate differed substantially, depending on the bath composition. In the coatings produced by hot-dipping in pure aluminium the zone adjacent to the outer layer had a composition similar to that produced from an AlTi5 bath, the Al3Fe phase was identified in this zone. The Al3Fe also contained silicon but its amount was lower than that in the Al5Fe2. In the coatings produced by hot-dipping in AlSi11, the zone adjacent to the outer layer contained the Al3FeSi phase. The analysis results showed that when AlSi11 alloy was applied, the growth mode of the inner layer changed from inwards to outwards. The interface between the Al5Fe2 phase and the cast iron substrate was flat and the zone of this phase was very thin. Locally, there were deep penetrations of the Al5FeSi phase into the outer layer, and the interface between this phase and the outer layer was irregular. Immersion in an AlTi5 bath caused that the inner intermetallic layer was thicker than when pure aluminium or AlSi11 alloy baths were used; also, some porosity was observed in this layer; and finally, the interface between the inner layer and the cast iron substrate was the most irregular.
    Źródło:
    Archives of Foundry Engineering; 2014, 14, 1; 85-90
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Processing, microstructure and properties of laminated Ni-intermetallic composites synthesised using Ni sheets and Al foils
    Wytwarzanie, struktura oraz własności kompozytu warstwowego Ni-fazy międzymetaliczne uzyskanego z blachy niklowej i folii aluminiowej
    Autorzy:
    Konieczny, M.
    Mola, R.
    Thomas, P.
    Kopciał, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/351420.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    kompozyt warstwowy
    mikrostruktura
    glinki niklu
    własności mechaniczne
    multilayer composite
    microstructure
    nickel aluminides
    mechanical properties
    Opis:
    The laminated Ni-(NiAl3+Ni2Al3) and Ni-Ni2Al3 intermetallic composites were fabricated by reaction synthesis in vacuum using Ni sheets and Al foils. The aluminium layers were completely consumed due to the formation of intermetallic phases. The Ni-Al reaction at 620°C was studied by interrupting in steps the reaction process to observe the microstructural changes. The final microstructure consisted of alternating layers of intermetallic phases and unreacted nickel can be designed easily because the stable structures of the composites depend only on the treating time. Microstructural examinations using scanning electron microscopy (SEM), X-ray diffraction (XRD) and X-ray microprobe analysis (EDX) demonstrated that after 1h of treatment Ni2Al3 is the predominant intermetallic phase. The formation of the Ni2Al3 phase is thermodynamically favoured over the formation of the other phases and can be understood from the steps occurred through a series of solid state reactions. The tensile strength of the laminated composites increases with an increase of the volume fraction of the intermetallic products. However, it decreases after long heat treatment because the Ni2Al3/Ni2Al3 interfaces can very easily delaminate due to a very weak bonding caused by continuous Al2O3 inclusions. Observations show that the laminated composites exhibit a mixture of brittle fracture of intermetallics and ductile one of residual Ni layers.
    Używając blachy niklowej i folii aluminiowej wytworzono kompozyty warstwowe Ni-(NiAl3+Ni2Al3) oraz Ni-Ni2Al3. W wyniku reakcji syntezy zachodzących w temperaturze 620°C warstwy aluminium kompletnie przereagowały z częścią niklu i utworzyły fazy międzymetaliczne. Badano przebieg reakcji pomiędzy niklem i aluminium w temperaturze 620°C przerywając zachodzące reakcje i obserwując zmiany mikrostruktur. Stwierdzono, iż można łatwo sterować zmianami strukturalnymi wielowarstwowego kompozytu, gdyż zależą one jedynie od czasu wygrzewania. Badania z wykorzystaniem mikroskopu skaningowego, dyfraktometru oraz z zastosowaniem mikroanalizatora rentgenowskiego wykazały, że po 1 godzinie wygrzewania w 620°C dominującą fazą jest Ni2Al3, gdyż ma ona najniższą energię formowania w tej temperaturze. Wytrzymałość na rozciąganie kompozytów warstwowych Ni-fazy międzymetaliczne wzrasta wraz z czasem wygrzewania, a co za tym idzie, wraz ze wzrostem objętości faz międzymetalicznych. Jednak gdy czas wygrzewania jest dłuższy niż 2 godziny wytrzymałość na rozciąganie kompozytów zaczyna spadać. Spowodowane jest to występowaniem Al2O3 na styku uformowanych warstw Ni2Al3/Ni2Al3 i ich łatwą delaminacją. Obserwacje mikroskopowe wykazały, że przełom kompozytów warstwowych charakteryzuje się mieszanym charakterem, częściowo kruchym (dla faz międzymetalicznych) i częściowo ciągliwym (dla warstw niklu).
    Źródło:
    Archives of Metallurgy and Materials; 2011, 56, 3; 693-702
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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