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<p>The decomposition of the bcc Fe-rich Fe–Ni solid solution upon annealing has been studied using a complex approach including experimental investigations (Mössbauer and SEM studies) and ab initio calculations. Mössbauer spectra of the alloys with 7 and 10 at.% of Ni in the quenched state show a wide range of hyperfine fields (HFFs) mainly exceeding that characteristic of pure Fe. Upon annealing, the HFFs change indicating a redistribution of nickel atoms in the grain bulk. Using the EBSD method, the formation of Ni-rich precipitates near grain boundaries and a slight decrease in the nickel concentration in the bulk were revealed. In the Fe-10 at.% Ni alloy, the formation of grain boundary segregation provides para-equilibrium conditions, which results in bcc–fcc transformation and the fcc–Fe–Ni precipitations. The theoretical analysis based on first-principles calculations made it possible to explain the observed structural features.</p> Graphical abstract <p></p>

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Decomposition and formation of fcc FeNi precipitates in dilute Fe–Ni alloy

  • 期刊论文

  • 发表日期：

    2025年3月6日

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  • N. M. Kleinerman,
  • A. V. Protasov,
  • S. P. Naumov,
  • E. B. Marchenkova,
  • M. V. Petrik,
  • I. K. Razumov,
  • V. G. Pushin,
  • N. V. Mushnikov,
  • Yu. N. Gornostyrev

摘要

The decomposition of the bcc Fe-rich Fe–Ni solid solution upon annealing has been studied using a complex approach including experimental investigations (Mössbauer and SEM studies) and ab initio calculations. Mössbauer spectra of the alloys with 7 and 10 at.% of Ni in the quenched state show a wide range of hyperfine fields (HFFs) mainly exceeding that characteristic of pure Fe. Upon annealing, the HFFs change indicating a redistribution of nickel atoms in the grain bulk. Using the EBSD method, the formation of Ni-rich precipitates near grain boundaries and a slight decrease in the nickel concentration in the bulk were revealed. In the Fe-10 at.% Ni alloy, the formation of grain boundary segregation provides para-equilibrium conditions, which results in bcc–fcc transformation and the fcc–Fe–Ni precipitations. The theoretical analysis based on first-principles calculations made it possible to explain the observed structural features.

Graphical abstract