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<p>The phase compositions and structural transformations in the Fe<sub>73</sub>Ga<sub>27</sub> alloy with trace amounts (~ 0.1 − 0.2 at%) of rare earth (RE) elements (Er, Pr, Sm, Tb, Yb) have been analyzed in neutron diffraction experiments performed over a wide temperature range. In the initial as-cast state, all Fe-Ga-RE alloys, except for the composition with Yb, are in a metastable state with the structure of the <i>D</i>0<sub>3</sub> phase. In the alloy with Yb, a noticeable amount (17%) of the <i>L</i>1<sub>2</sub> phase is present even in the initial state. When the alloys are slowly heated to 900&#xa0;°C (2&#xa0;°C/min), the structural transformations generally occur similarly to the initial Fe<sub>73</sub>Ga<sub>27</sub> alloy. Upon subsequent cooling to room temperature, an equilibrium <i>L</i>1<sub>2</sub> phase is formed in all alloys with RE elements and suppression of the HCP-phases (<i>A</i>3/<i>D</i>0<sub>19</sub>) formation is observed, which is especially strong in the compositions with Pr, Sm and Tb, whereas in the Fe<sub>73</sub>Ga<sub>27</sub> alloy the <i>L</i>1<sub>2</sub> and <i>D</i>0<sub>19</sub> phases are present in approximately equal proportions. The microstructure of the alloys, with the exception of Fe-Ga-Tb, is homogeneous in the initial state with large (&gt; 3000 Å) characteristic sizes of coherent scattering domains (CSDs) and a small (&lt; 0.001) level of microstrains. In the alloy with Tb, the microstructure is a matrix of a partially ordered <i>B</i>2 phase with dispersed embedded clusters of the ordered <i>D</i>0<sub>3</sub> phase with characteristic CSD sizes of ~ 400 Å. No traces of the <i>L</i>6<sub>0</sub> tetragonal phase were found in the neutron diffraction patterns of the studied Fe<sub>73</sub>Ga<sub>27</sub>-RE alloys.</p>

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RE-dependent phase transformations and structures in Fe73Ga27-RE alloys

  • 期刊论文

  • 发表日期：

    2025年4月11日

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  • B. Yerzhanov,
  • A. M. Balagurov,
  • B. Mukhametuly,
  • N. Yu. Samoylova,
  • S. V. Sumnikov,
  • V. V. Palacheva,
  • I. S. Golovin

摘要

The phase compositions and structural transformations in the Fe73Ga27 alloy with trace amounts (~ 0.1 − 0.2 at%) of rare earth (RE) elements (Er, Pr, Sm, Tb, Yb) have been analyzed in neutron diffraction experiments performed over a wide temperature range. In the initial as-cast state, all Fe-Ga-RE alloys, except for the composition with Yb, are in a metastable state with the structure of the D03 phase. In the alloy with Yb, a noticeable amount (17%) of the L12 phase is present even in the initial state. When the alloys are slowly heated to 900 °C (2 °C/min), the structural transformations generally occur similarly to the initial Fe73Ga27 alloy. Upon subsequent cooling to room temperature, an equilibrium L12 phase is formed in all alloys with RE elements and suppression of the HCP-phases (A3/D019) formation is observed, which is especially strong in the compositions with Pr, Sm and Tb, whereas in the Fe73Ga27 alloy the L12 and D019 phases are present in approximately equal proportions. The microstructure of the alloys, with the exception of Fe-Ga-Tb, is homogeneous in the initial state with large (> 3000 Å) characteristic sizes of coherent scattering domains (CSDs) and a small (< 0.001) level of microstrains. In the alloy with Tb, the microstructure is a matrix of a partially ordered B2 phase with dispersed embedded clusters of the ordered D03 phase with characteristic CSD sizes of ~ 400 Å. No traces of the L60 tetragonal phase were found in the neutron diffraction patterns of the studied Fe73Ga27-RE alloys.