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    Study the microstructure of three and four component phases in Al-Ni-Fe-La alloys

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    Type
    Poster
    Authors
    Kolobylina, Natalia
    Vasiliev, Alexander
    Lopatin, Sergei cc
    Presniakov, Mikhail
    Bakhteeva, Natalia
    Ivanova, Anna
    Todorova, Elena
    KAUST Department
    Electron Microscopy
    Imaging and Characterization Core Lab
    Date
    2016-12-21
    Permanent link to this record
    http://hdl.handle.net/10754/625024
    
    Metadata
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    Abstract
    Aluminium alloys play a key role in modern engineering since they are the most used non-ferrous material. They have been widely used in automotive, aerospace, and construction engineering due to their good corrosion resistance, superior mechanical properties along with good machinability, weldability, and relatively low cost. The progress in practical application has been determined by intensive research and development works on the Al alloys. A new class of Al–REM–TM aluminum alloys (REM indicates rare earth metal and TM is transition metal) was revealed in the end of the last century. These alloys differ from conventional ones by their extraordinary ability to form metal glasses and nanoscale composites in a wide range of compositions. Having low density, these alloys possess unique mechanical characteristics and corrosion resistance. Two as received alloys, namely Al85Ni9Fe2La4 and Al85Ni7Fe4La4 were obtained in the form of ingots from melts of corresponding compositions upon cooling in air were studied by scanning/transmission electron microscopy (STEM), energy dispersive X-ray (EDX) microanalysis and X-ray diffraction (XRD). The microstructural analyses were performed in a aberration corrected TITAN 80-300 TEM/STEM (FEI, USA) attached with EDX spectrometer with ultrathin window (EDAX, USA). The specimens for transmission electron microscopy (TEM) were prepared by an electrochemical or ion etching. It was found that the received alloys exhibits along with fcc Al and Al4La (Al11La3) particles, these alloys contain a ternary phase Al3Ni1 Fe isostructural to the Al3Ni phase and a quaternary phase Al8Fe2 NiLa isostructural to the Al8Fe2Eu phase and monoclinic phase Al9(Fe,Ni)2 isostructural to the Al9Co2. The study by HRSTEM together with a new atomic resolution energy dispersive X-ray microanalysis method demonstrated that Fe and Ni atoms substituted one another in the Al8Fe2–NiLa quaternary compound. Besides, several types of defects were determined: first ones have a form of a δ -layers and they are Al3.2Fe1–Ni ternary compound with a Al3.2Fe structure type. Second ones were point defects, which are La vacancies. The experimental part of this work was partially done on the equipment of the Resource Center of Probe and Electron Microscopy (Kurchatov Complex of NBICS-Technologies, NRC “Kurchatov Institute”)
    Citation
    Kolobylina N, Vasiliev A, Lopatin S, Presniakov M, Bakhteeva N, et al. (2016) Study the microstructure of three and four component phases in Al-Ni-Fe-La alloys. European Microscopy Congress 2016: Proceedings: 374–375. Available: http://dx.doi.org/10.1002/9783527808465.emc2016.6866.
    Publisher
    Wiley
    Journal
    European Microscopy Congress 2016: Proceedings
    DOI
    10.1002/9783527808465.emc2016.6866
    Additional Links
    http://onlinelibrary.wiley.com/doi/10.1002/9783527808465.EMC2016.6866/abstract
    ae974a485f413a2113503eed53cd6c53
    10.1002/9783527808465.emc2016.6866
    Scopus Count
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    Posters; Imaging and Characterization Core Lab

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