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    Microstructural Peculiarities of Al-Rich Al-La-Ni-Fe Alloys

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    Type
    Article
    Authors
    Vasiliev, A. L.
    Bakhteeva, N. D.
    Presniakov, M. Yu.
    Lopatin, Sergei
    Kolobylina, N. N.
    Ivanova, A. G.
    Todorova, E. V.
    KAUST Department
    King Abdullah University of Science and Technology (KAUST), Core Labs, Thuwal, Saudi Arabia
    Date
    2019-02-08
    Online Publication Date
    2019-02-08
    Print Publication Date
    2019-04
    Permanent link to this record
    http://hdl.handle.net/10754/631031
    
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    Abstract
    The results of a comprehensive microstructural study of the ternary and quaternary phases in air-cast Al85Ni11−xFexLa4 (where x = 2 and 4 at. pct) polycrystalline alloys by means of optical microscopy, scanning electron microscopy, transmission electron microscopy, scanning transmission electron microscopy, energy-dispersive X-ray microanalysis, and X-ray diffraction are presented. It was found that these alloys contain several phases, namely, fcc-Al, Al11La3, Al3Ni1−xFex, Al9Ni2−xFex, Al8Fe2−xNixLa, and Al3.2Fe1−xNix, in the form of δ-layers in Al8Fe2−xNixLa particles. A high density of other defects in the quaternary Al8Fe2−xNixLa particles was found, and the formation of these defects could be caused by the dendritic type of growth of this phase. The crystal structures of all these defects were revealed by high-resolution scanning transmission electron microscopy together with atomic-resolution energy-dispersive X-ray microanalysis. The thermal stability of the ternary and quaternary phases was also studied. The Al8Fe2−xNixLa phase is metastable and undergoes an irreversible transformation: Al8Fe2−xNixLa → Al9Ni2−xFex + Al11La3. Based on these data, a sequence of solid-phase reactions in these alloys during cooling and heating is proposed.
    Citation
    Vasiliev AL, Bakhteeva ND, Presniakov MY, Lopatin S, Kolobylina NN, et al. (2019) Microstructural Peculiarities of Al-Rich Al-La-Ni-Fe Alloys. Metallurgical and Materials Transactions A. Available: http://dx.doi.org/10.1007/s11661-019-05127-x.
    Sponsors
    The alloy formation and OM work was carried out under state Assignment No 007-00129-18-00 (IMET RAS). The XRD and EM experiments were supported by the Ministry of Science and Higher Education within the state assignment FSRC “Crystallography and Photonics” RAS. The XRD analysis was performed using the equipment of the Shared Research Center FSRC “Crystallography and Photonics” RAS.
    Publisher
    Springer Nature
    Journal
    Metallurgical and Materials Transactions A
    DOI
    10.1007/s11661-019-05127-x
    Additional Links
    https://link.springer.com/article/10.1007%2Fs11661-019-05127-x
    ae974a485f413a2113503eed53cd6c53
    10.1007/s11661-019-05127-x
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