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Structural-Phase Changes of the Fe3C/Fe7C3/P-Phase/Cam Mechanocomposite at Heating

  • STRUCTURE, PHASE TRANSFORMATIONS, AND DIFFUSION
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Abstract

The effect of the action of temperature on the structure and phase composition of an Fe3C/Fe7C3/P-phase/Cam composite obtained by mechanosynthesis of Fe–75 at % C has been studied by the methods of X‑ray diffraction, Mössbauer spectroscopy, thermogravimetric analysis, and differential scanning calorimetry. It is shown that the structural and phase changes at heating have a multistage character. In the temperature range 315–400°C crystallization of the paramagnetic P-phase with generation of Fe3C and/or Fe7C3 occur. In the course of heating to higher temperatures, complete decomposition of carbide Fe7C3 (in the range 450–550°C) and partial decomposition of Fe3C (at 600°C and above) are observed. After cooling from 800–1000°C the mechanocomposite consists of α-Fe, cementite Fe3C, and graphite. The phase transformations are accompanied by the processes of composite oxidation with the formation of Fe3O4 oxide and its subsequent reduction. The P-phase is a disorded amorphous carbide Fe1 – xCx, which is characterized by magnetic ordering at the temperature of liquid nitrogen.

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ACKNOWLEDGMENTS

The authors thank M.A. Eremina for the data obtained by the DSC/TGA method, L.V. Kamaeva for performing the heating by the DSC method, and O.N. Nemtsova and G.A. Dorofeev for discussion of the results of Mössbauer spectroscopy.

Funding

The work is supported by the research project no. 121030100001-3 and is carried out using the equipment of “The Center of the physical and physicochemical methods of analysis, investigation of the properties and characteristics of the surface, nanostructures, materials and products”, the Udmurt Federal Research Center, Ural Branch, Russian Academy of Sciences.

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  1. Udmurt Federal Research Center, Ural Branch, Russian Academy of Sciences, 426067, Izhevsk, Russia

    N. S. Larionova, R. M. Nikonova, V. I. Lad’yanov, A. A. Suslov & A. L. Ul’yanov

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  1. N. S. Larionova
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  2. R. M. Nikonova
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  3. V. I. Lad’yanov
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  5. A. L. Ul’yanov
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Correspondence to N. S. Larionova.

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Larionova, N.S., Nikonova, R.M., Lad’yanov, V.I. et al. Structural-Phase Changes of the Fe3C/Fe7C3/P-Phase/Cam Mechanocomposite at Heating. Phys. Metals Metallogr. 124, 271–278 (2023). https://doi.org/10.1134/S0031918X23600094

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