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Abstract <p>It is shown that in the presence of carbon in Fe<sub>74</sub>Ga<sub>26</sub> and Fe<sub>74</sub>(Ga,Al)<sub>26</sub> alloys, perovskite-like structure of the <i>E</i>2<sub>1</sub> type (also known as κ-carbide) can form. The results were obtained in high-resolution neutron diffraction experiments on bulk samples and confirmed by measurements of X-ray and electron diffraction patterns. The main structural phase in the studied alloys is mesoscopic clusters <i>D</i>0<sub>3</sub> randomly embedded in a <i>B</i>2 matrix. Regions with the <i>E</i>2<sub>1</sub> phase are observed both along the grain boundaries and in the volume of <i>D</i>0<sub>3</sub>. For the first time, the quantitative structural and crystallographic characteristics of the κ-carbide phase in Fe-Ga based alloys were precisely determined and the presence of <i>E</i>2<sub>1</sub>-I and <i>E</i>2<sub>1</sub>-II phases with slightly different compositions was proved. Their linear dependence on the gallium content was demonstrated. As Fe<sub>3</sub>(Ga,Al) alloys exhibit also an enhanced magnetostriction, the presence of the <i>E</i>2<sub>1</sub> phase should be considered in future, which has not been done so far.</p> Graphical abstract <p></p>

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First comprehensive structural study of the E21 carbide phase in Fe-Ga(Al) alloys

  • 期刊论文

  • 发表日期：

    2026年3月2日

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  • A. M. Balagurov,
  • A. S. Sohatsky,
  • S. V. Sumnikov,
  • B. Yerzhanov,
  • H. W. Chang,
  • I. S. Golovin

摘要

Abstract

It is shown that in the presence of carbon in Fe74Ga26 and Fe74(Ga,Al)26 alloys, perovskite-like structure of the E21 type (also known as κ-carbide) can form. The results were obtained in high-resolution neutron diffraction experiments on bulk samples and confirmed by measurements of X-ray and electron diffraction patterns. The main structural phase in the studied alloys is mesoscopic clusters D03 randomly embedded in a B2 matrix. Regions with the E21 phase are observed both along the grain boundaries and in the volume of D03. For the first time, the quantitative structural and crystallographic characteristics of the κ-carbide phase in Fe-Ga based alloys were precisely determined and the presence of E21-I and E21-II phases with slightly different compositions was proved. Their linear dependence on the gallium content was demonstrated. As Fe3(Ga,Al) alloys exhibit also an enhanced magnetostriction, the presence of the E21 phase should be considered in future, which has not been done so far.

Graphical abstract