The Fe–Mo–C spinning ribbons produced by rapid melt cooling at a rate of ~106 K/s have been studied by transmission electron microscopy. The metastable ternary phase of stoichiometry close to Fe7.5MoC1.5 has been found for the first time. In conditions far from equilibrium, this phase behaves like a metallochemical and structural analogue of elementary Mn in thermodynamic equilibrium conditions, namely: it can appear in crystalline structures that are isostructural to γ, β, and α polymorphic modifications of Mn (γ, π, and χ phases, respectively). In addition, the temperature sequence of diffusionless γ → π → χ transformations in the cooling process is similar to the temperature sequence of polymorphic γ → β → α transformations of Mn. In this case, the γ → π transformation is close to martensitic one, and the temperature of the π → χ transformation of nanosized metastable phases is close to the temperature of the polymorphic β-Mn ⇄ α-Mn transformation. The crystal lattices of the π and γ phases obey orientation relationships, for example: \( (110)\uppi \left[2\overline{2}1\right]\uppi \Big\Vert (101)\upgamma \left[0\overline{1}0\right]\upgamma . \)
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Notes
The process was conducted with participation of V.V. Kuprin, Head of Melting Sector at the Frantsevich Institute for Problems of Materials Science.
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The authors are grateful to M.V. Karpets, ScD in Physics and Mathematics, for participation in the discussion of the results obtained.
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Translated from Poroshkova Metallurgiya, Vol. 57, Nos. 7–8 (522), pp. 138–149, 2018.
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Velikanova, T.A., Graivoronskii, M.V., Zaslavskii, A.M. et al. New Metastable Ternary Fe7.5MoC1.5 Phase: Nanosized State and Mn-Like Polymorphism. Powder Metall Met Ceram 57, 480–489 (2018). https://doi.org/10.1007/s11106-018-0007-9
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DOI: https://doi.org/10.1007/s11106-018-0007-9