On redistribution of Cr and Si in (Fe, Cr, Si)75C25nanocomposites: mechanosynthesis and annealing

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Abstract

The phase analysisof nanocrystalline alloys of composition (Fe0.97-xCrxSi0.03)75C25, wherex = 0.05and 0.10, in the states after mechanosynthesis (MS) and subsequentannealing is performed by methods of X-ray diffraction, Mössbauer spectroscopy,and magnetic measurements. MS yields ~46–58 vol. % of the X-rayamorphous phase (XAP), ~30–39 vol. % ofχ-carbide, and only ~9–11vol. % of cementite. Mechanosynthesized carbides are doped both with chromiumand silicon. During annealing in the temperature rangeТann=400–500°C, the process of silicon release from carbides withits subsequent dissolution in ferrite is completed. XAP crystallization istwo-stage. The first stage (Тann < 500°C) is characterizedby carbides formed out of Si-depleted regions of XAP. Atthe second stage (Тann ≥500°C), the residual XAPdecomposes to form ferrite and cementite with a higher concentrationof Cr than that of the cementite formed both atthe first stage of XAP crystallization and during MS. Furtherincrease of Тann leads to a more homogeneous distribution ofchromium atoms in cementite.

About the authors

A. A. Chulkina

Udmurt Federal Research Center of the Ural Branch of Sciences of the Russian Academy of Sciences

Email: chulkina@udman.ru
Izhevsk, Russia

A. I. Ul’yanov

Udmurt Federal Research Center of the Ural Branch of Sciences of the Russian Academy of Sciences

Email: chulkina@udman.ru
Izhevsk, Russia

A. L. Ul’yanov

Udmurt Federal Research Center of the Ural Branch of Sciences of the Russian Academy of Sciences

Email: chulkina@udman.ru
Izhevsk, Russia

A. V. Zagainov

Udmurt Federal Research Center of the Ural Branch of Sciences of the Russian Academy of Sciences

Author for correspondence.
Email: chulkina@udman.ru
Izhevsk, Russia

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