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<p>SmFe<sub>12</sub>-based alloys perform promising potential for new generation permanent magnets, attributed to their high saturation magnetization (<i>M</i><sub>s</sub>) and anisotropy field (<i>H</i><sub>a</sub>). Introduction of the low melting point element Cu can promote the formation of non-magnetic grain boundaries in Sm–Fe–Ti system. The effect of Cu content on the grain boundary phase formation and magnetic properties in Sm(Fe<sub>0.8</sub>Co<sub>0.2</sub>)<sub>11−<i>x</i></sub>TiCu<sub><i>x</i></sub> (<i>x</i> = 0–0.5) strips has been investigated. Sm(Fe<sub>0.8</sub>Co<sub>0.2</sub>)<sub>10.8</sub>TiCu<sub>0.2</sub> strip exhibited a maximum <i>M</i><sub>s</sub> value of 1.07&#xa0;T. Coercivity improved from 20.96 kA m<sup>−1</sup> for Sm(Fe<sub>0.8</sub>Co<sub>0.2</sub>)<sub>11</sub>Ti strip to 165.92 kA m<sup>−1</sup> for Sm(Fe<sub>0.8</sub>Co<sub>0.2</sub>)<sub>10.5</sub>TiCu<sub>0.5</sub> strip. When Cu content increased from 0 to 0.5 at.%, Fe content of the grain boundary phase decreased from 43.8 to 12.6 at.%. Due to the good wettability of Cu, main 1:12 phase is well isolated and enveloped by (Sm, Cu)-rich grain boundary phase. Cu addition facilitates the formation of the continuous non-magnetic grain boundaries and reduces grain size of main 1:12 phase, contributing to coercivity improvement of the strips.</p>

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Grain boundary phase formation and coercivity improvement of Sm(Fe0.8Co0.2)11−xTiCux (x = 0–0.5) strips with Cu doping

  • 期刊论文

  • 发表日期：

    2025年3月22日

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  • Feng-yang Liu,
  • Hang Zhao,
  • Hai-bo Feng

摘要

SmFe12-based alloys perform promising potential for new generation permanent magnets, attributed to their high saturation magnetization (Ms) and anisotropy field (Ha). Introduction of the low melting point element Cu can promote the formation of non-magnetic grain boundaries in Sm–Fe–Ti system. The effect of Cu content on the grain boundary phase formation and magnetic properties in Sm(Fe0.8Co0.2)11−xTiCux (x = 0–0.5) strips has been investigated. Sm(Fe0.8Co0.2)10.8TiCu0.2 strip exhibited a maximum Ms value of 1.07 T. Coercivity improved from 20.96 kA m−1 for Sm(Fe0.8Co0.2)11Ti strip to 165.92 kA m−1 for Sm(Fe0.8Co0.2)10.5TiCu0.5 strip. When Cu content increased from 0 to 0.5 at.%, Fe content of the grain boundary phase decreased from 43.8 to 12.6 at.%. Due to the good wettability of Cu, main 1:12 phase is well isolated and enveloped by (Sm, Cu)-rich grain boundary phase. Cu addition facilitates the formation of the continuous non-magnetic grain boundaries and reduces grain size of main 1:12 phase, contributing to coercivity improvement of the strips.