The paper presents the transmission and the scanning electron microscope investigations of the phase composition and fine structure of Ni–Al–Cr-based alloy alloyed by rhenium and lanthanum. The alloy is prepared by the directional crystallization technique and then subjected to 1150°С annealing during 1 hour. It is shown that γ- and γ′-phases are major and have a face-centered cubic crystal system. Solid solutions of γ- and γ′-phase have a disordered and an ordered atom arrangement, respectively. The latter has L12 superstructure. It is found that rhenium and lanthanum alloying leads to the structural modification of γ′-phase quasi-cuboids. Not dissolving in major phases, rhenium and lanthanum are phase-formation elements and form σ-phase. The phase composition and morphology of these phases are studied and described.
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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 2, pp. 31–34, February, 2017.
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Nikonenko, E.L., Popova, N.A., Dement, T.V. et al. Structure and Phase Composition of Ni–Al–Cr Alloy Alloyed by Rhenium and Lanthanum. Russ Phys J 60, 231–235 (2017). https://doi.org/10.1007/s11182-017-1066-y
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DOI: https://doi.org/10.1007/s11182-017-1066-y