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<p>The phase equilibria of the Dy-Fe-B ternary system at 873 and 1073&#xa0;K were investigated experimentally in this work using the equilibrated alloy method combined with scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS) and X-ray powder diffraction (XRD). The experimental analysis identified five stable ternary intermetallic compounds, namely Dy<sub>2</sub>Fe<sub>14</sub>B (τ<sub>1</sub>) with the Nd<sub>2</sub>Fe<sub>14</sub>B-type structure and space group <i>P4</i><sub><i>2</i></sub><i>/mnm</i>, DyFe<sub>4</sub>B<sub>4</sub> (τ<sub>3</sub>) with the Nd<sub>1+ε</sub>Fe<sub>4</sub>B<sub>4</sub>-type structure and space group <i>Pccn</i>, Dy<sub>5</sub>Fe<sub>2</sub>B<sub>6</sub> (τ<sub>4</sub>) with the Pr<sub>5−x</sub>Co<sub>2+x</sub>B<sub>6</sub>-type structure and space group <i>R</i><InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\overline{3}\)</EquationSource> <EquationSource Format="MATHML"><math> <mover> <mn>3</mn> <mo>¯</mo> </mover> </math></EquationSource> </InlineEquation><i>m</i>, Dy<sub>3</sub>FeB<sub>7</sub> (τ<sub>5</sub>) with the Y<sub>3</sub>ReB<sub>7</sub>-type structure and space group <i>Cmcm</i>, and DyFeB<sub>4</sub> (τ<sub>6</sub>) with the YCrB<sub>4</sub>-type structure and space group <i>Pbam</i>, at 873 and 1073&#xa0;K. It is noteworthy that DyFe<sub>2</sub>B<sub>2</sub> (τ<sub>2</sub>) reported previously in the literature was not found in the present analyses of the measured equilibrated alloys. Finally, based on the experimentally determined results, two isothermal sections of the Dy-Fe-B ternary system at 873 and 1073&#xa0;K were constructed, providing key experimental data and a theoretical basis for the thermodynamic calculation of this ternary system and the design of high-performance and low-cost Nd-Dy-Fe-B permanent magnets.</p>

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Phase Equilibria of the Dy-Fe-B Ternary System

  • 期刊论文

  • 发表日期：

    2026年7月21日

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  • Jiang Wang,
  • Xiang Liu,
  • Cong Tan,
  • Kang Song,
  • Lin Sun,
  • Qingrong Yao,
  • Hongyu Zhang

摘要

The phase equilibria of the Dy-Fe-B ternary system at 873 and 1073 K were investigated experimentally in this work using the equilibrated alloy method combined with scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS) and X-ray powder diffraction (XRD). The experimental analysis identified five stable ternary intermetallic compounds, namely Dy2Fe14B (τ1) with the Nd2Fe14B-type structure and space group P42/mnm, DyFe4B4 (τ3) with the Nd1+εFe4B4-type structure and space group Pccn, Dy5Fe2B6 (τ4) with the Pr5−xCo2+xB6-type structure and space group R \(\overline{3}\) 3 ¯ m, Dy3FeB7 (τ5) with the Y3ReB7-type structure and space group Cmcm, and DyFeB4 (τ6) with the YCrB4-type structure and space group Pbam, at 873 and 1073 K. It is noteworthy that DyFe2B2 (τ2) reported previously in the literature was not found in the present analyses of the measured equilibrated alloys. Finally, based on the experimentally determined results, two isothermal sections of the Dy-Fe-B ternary system at 873 and 1073 K were constructed, providing key experimental data and a theoretical basis for the thermodynamic calculation of this ternary system and the design of high-performance and low-cost Nd-Dy-Fe-B permanent magnets.