Abstract
The microstructure of alloys based on the Al-La-Ni-Fe system, which are characterized by a unique ability to form metal glasses and nanoscale composites in a wide range of compositions, has been investigated. Al85Ni7Fe4La4 and Al85Ni9Fe2La4 alloys have been analyzed by electron microscopy (including high-resolution scanning transmission electron microscopy), energy-dispersive X-ray microanalysis, electron diffraction (ED), and X-ray diffraction (XRD). It is found that, along with fcc Al and Al4La (Al11La3) particles, these alloys contain a ternary phase Al3Ni1 − x Fe x (sp. gr. Pnma) isostructural to the Al3Ni phase and a quaternary phase Al8Fe2 − x Ni x La isostructural to the Al8Fe2Eu phase (sp. gr. Pbam). The unit-cell parameters of the Al3Ni1 − x Fe x and Al8Fe2 − x Ni x La compounds, determined by ED and refined by XRD, are a = 0.664(1) nm, b = 0.734(1) nm, and c = 0.490(1) nm for Al3Ni1 − x Fe x and a = 1.258(3) nm, b = 1.448(3) nm, and c = 0.405(8) nm for Al8Fe2 − x Ni x La. In both cases Ni and Fe atoms are statistically arranged, and no ordering is found. Al8Fe2 − x Ni x La particles contain inclusions in the form of Al3Fe δ layers.
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Original Russian Text © A.L. Vasil’ev, A.G. Ivanova, N.D. Bakhteeva, N.N. Kolobylina, A.S. Orekhov, M.Yu. Presnyakov, E.V. Todorova, 2015, published in Kristallografiya, 2015, Vol. 60, No. 1, pp. 28–34.
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Vasil’ev, A.L., Ivanova, A.G., Bakhteeva, N.D. et al. Microstructure of the Al-La-Ni-Fe system. Crystallogr. Rep. 60, 23–29 (2015). https://doi.org/10.1134/S1063774514060297
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DOI: https://doi.org/10.1134/S1063774514060297