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    Microstructure and positron lifetimes of zirconium modified aluminide coatings

    New search for: Romanowska, Jolanta
    New search for: Dryzek, Ewa
    New search for: Morgiel, Jerzy
    New search for: Siemek, Krzysztof
    New search for: Kolek, Łukasz

    The microstructure of the zirconium modified and non-modified aluminide coatings was examined by the EDS, XRD, TEM and the positron annihilation spectroscopy methods. Both coatings have a double layer structure: β-NiAl phase on the top and γ′-Ni3Al below. Small zirconium nanoparticles were found along grain boundaries in the β-NiAl phase. The positron lifetime in both coatings is the same. The formation of zirconium precipitates neither affects, the number of defects nor the volume diffusion. Zirconium nanoparticles that precipitate along grain boundaries stand against the outward diffusion of Al ions through the coating to the coating/oxygen interface. This “blocking effect” may be responsible for the reduction of the alumina scale growth rate and may delay pore formation on the coating/oxygen interface.

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    Microstructure and positron lifetimes of zirconium modified aluminide coatings

    New search for: Romanowska, Jolanta
    New search for: Dryzek, Ewa
    New search for: Morgiel, Jerzy
    New search for: Siemek, Krzysztof
    New search for: Kolek, Łukasz

    The microstructure of the zirconium modified and non-modified aluminide coatings was examined by the EDS, XRD, TEM and the positron annihilation spectroscopy methods. Both coatings have a double layer structure: β-NiAl phase on the top and γ′-Ni3Al below. Small zirconium nanoparticles were found along grain boundaries in the β-NiAl phase. The positron lifetime in both coatings is the same. The formation of zirconium precipitates neither affects, the number of defects nor the volume diffusion. Zirconium nanoparticles that precipitate along grain boundaries stand against the outward diffusion of Al ions through the coating to the coating/oxygen interface. This “blocking effect” may be responsible for the reduction of the alumina scale growth rate and may delay pore formation on the coating/oxygen interface.

    Access

    Check access
    Check availability in my library
    Order at Subito €

    Microstructure and positron lifetimes of zirconium modified aluminide coatings

    New search for: Romanowska, Jolanta
    New search for: Dryzek, Ewa
    New search for: Morgiel, Jerzy
    New search for: Siemek, Krzysztof
    New search for: Kolek, Łukasz

    The microstructure of the zirconium modified and non-modified aluminide coatings was examined by the EDS, XRD, TEM and the positron annihilation spectroscopy methods. Both coatings have a double layer structure: β-NiAl phase on the top and γ′-Ni3Al below. Small zirconium nanoparticles were found along grain boundaries in the β-NiAl phase. The positron lifetime in both coatings is the same. The formation of zirconium precipitates neither affects, the number of defects nor the volume diffusion. Zirconium nanoparticles that precipitate along grain boundaries stand against the outward diffusion of Al ions through the coating to the coating/oxygen interface. This “blocking effect” may be responsible for the reduction of the alumina scale growth rate and may delay pore formation on the coating/oxygen interface.

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    Title:

    Microstructure and positron lifetimes of zirconium modified aluminide coatings

    Additional title:

    Archiv.Civ.Mech.Eng

    Contributors:

    Romanowska, Jolanta (author) / Dryzek, Ewa (author) / Morgiel, Jerzy (author) / Siemek, Krzysztof (author) / Kolek, Łukasz (author) / Zagula-Yavorska, Maryana (author)

    Published in:

    Archives of Civil and Mechanical Engineering ; 18 ; 1150-1155

    Publication date:

    2018-12-01

    Size:

    6 pages

    ISSN:

    2083-3318

    DOI:

    https://doi.org/10.1016/j.acme.2018.03.002

    Type of media:

    Article (Journal)

    Type of material:

    Electronic Resource

    Language:

    English

    Keywords:

    Aluminide coatings , Zirconium , Positron annihilation spectroscopy , TEM analysis Chemical Sciences , Physical Chemistry (incl. Structural) , Engineering , Materials Engineering , Civil Engineering , Mechanical Engineering , Structural Materials

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