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Abstract <p>Phase analysis of nanocrystalline alloys with a composition of (Fe<InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11504_2025_6128_Article_IEq1.gif" Format="GIF" Height="11" Rendition="HTML" Resolution="72" Type="Linedraw" Width="40" /> </InlineMediaObject> <EquationSource Format="TEX">\(_{{0.97-x}}\)</EquationSource> <!--PhysChA2570049Chulkina-m1--> </InlineEquation>Cr<sub><i>x</i></sub>Si<sub>0.03</sub>)<sub>75</sub>C<sub>25</sub> (<i>x</i> = 0.05 and 0.10) in the states after mechanical synthesis (MS) and subsequent annealings was performed by X-ray diffractometry, Mössbauer spectroscopy, and magnetic measurements. Mechanical synthesis forms ~46–58&#xa0;vol % X-ray amorphous phase (XAP), ~30–39 vol % χ-carbide, and only ~9–11 vol % cementite. Mechanically synthesized carbides are doped not only with chromium, but also with silicon. During annealing in the temperature range <i>T</i><sub>ann</sub> = 400–500°C, all silicon is released from carbides and dissolved in ferrite. Crystallization of the XAP occurs in two stages. The first stage (<i>T</i><sub>ann</sub> &lt; 500°C) is characterized by the formation of carbides from the Si-depleted regions of the XAP. At the second stage (<i>T</i><sub>ann</sub> ≥ 500°C), the residual XAP decomposes into ferrite and cementite with a higher Cr concentration than in cementite formed both at the first stage of XAP crystallization and during MS. Further increase in <i>T</i><sub>ann</sub> leads to a more uniform distribution of chromium atoms in cementite.</p>

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On Cr and Si Redistribution in (Fe,Cr,Si)75C25 Nanocomposites: Mechanosynthesis and Annealing

  • 期刊论文

  • 发表日期：

    2025年4月25日

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  • A. A. Chulkina,
  • A. I. Ul’yanov,
  • A. L. Ul’yanov,
  • A. V. Zagainov

摘要

Abstract

Phase analysis of nanocrystalline alloys with a composition of (Fe \(_{{0.97-x}}\) CrxSi0.03)75C25 (x = 0.05 and 0.10) in the states after mechanical synthesis (MS) and subsequent annealings was performed by X-ray diffractometry, Mössbauer spectroscopy, and magnetic measurements. Mechanical synthesis forms ~46–58 vol % X-ray amorphous phase (XAP), ~30–39 vol % χ-carbide, and only ~9–11 vol % cementite. Mechanically synthesized carbides are doped not only with chromium, but also with silicon. During annealing in the temperature range Tann = 400–500°C, all silicon is released from carbides and dissolved in ferrite. Crystallization of the XAP occurs in two stages. The first stage (Tann < 500°C) is characterized by the formation of carbides from the Si-depleted regions of the XAP. At the second stage (Tann ≥ 500°C), the residual XAP decomposes into ferrite and cementite with a higher Cr concentration than in cementite formed both at the first stage of XAP crystallization and during MS. Further increase in Tann leads to a more uniform distribution of chromium atoms in cementite.