The enhancement of the magnetostriction for Fe-Ga alloys can significantly improve the magneto-mechanical conversion efficiency of magnetostrictive devices, which are widely applied in high-end equipment, aerospace and other fields. Recent studies have demonstrated that doping trace rare earth elements into Fe-Ga alloys can significantly enhance their magnetostriction. In this work, the < 100 >-oriented polycrystalline (Fe81Ga19)99.8Tb0.1(NbC)0.1 alloy with excellent magnetostriction was developed by employing a synergistic strategy of trace NbC-doping and quenching treatment. The < 001 >-oriented Fe-Ga alloys along the growth direction were prepared by directional solidification. The addition of NbC increased the solid solubility of Tb in the matrix of Fe-Ga alloy by 9.4 %, and this was further increased by 28.1 % after quenching treatment, inducing more L60 heterogeneities and enhancing lattice distortions in the matrix. The saturation magnetostriction of the < 100 > -oriented polycrystalline (Fe81Ga19)99.8Tb0.1(NbC)0.1 alloy before and after quenching reached 200 ppm and 295 ppm, respectively, which was 5.8 % and 5.6 % greater than that of the NbC-undoped (Fe81Ga19)99.9Tb0.1 alloy. The saturation magnetostrictions of all selected Fe-Ga alloy compositions after quenching treatment were more than 40 % higher than of the unquenched samples. The initial and average magnetostrictive strain sensitivity (dλ/dH) of all Fe-Ga alloys has been greatly improved after heating at 1200 ℃ for 2 hours. This work reveals that the reasonable alloy design and thermal treatment can effectively increase the solubility of Tb in the matrix and improve the magnetostriction of Fe-Ga alloys, which can provide a crucial guidance for future studies of magnetostrictive Fe-Ga alloys.

中文翻译：

---

痕量 NbC 掺杂淬火处理协同策略增强 <100> 取向多晶 （Fe81Ga19）99.8Tb0.1（NbC）0.1 合金的磁致伸缩


Fe-Ga合金磁致伸缩的增强可以显著提高磁致伸缩器件的磁机械转换效率，广泛应用于高端装备、航空航天等领域。最近的研究表明，在 Fe-Ga 合金中掺杂微量稀土元素可以显着增强其磁致伸缩。在本工作中，采用痕量 NbC 掺杂和淬火处理的协同策略，开发了具有优异磁致伸缩性能的 <100> 取向多晶 （Fe ₈₁ Ga） _{19 99.8} Tb _0.1 （NbC） _0.1 合金。采用定向凝固法制备了沿生长方向的 <001> 取向 Fe-Ga 合金。NbC 的加入使 Tb 在 Fe-Ga 合金基体中的固溶性提高了 9.4%，淬火处理后进一步提高了 28.1%，诱导了更多的 L6 ₀ 非均质性，增强了基体中的晶格畸变。<100>取向多晶 （Fe ₈₁ Ga ₁₉ ） _99.8 Tb _0.1 （NbC） _0.1 合金淬火前后的饱和磁致伸缩分别达到 200 ppm 和 295 ppm，比 NbC 未掺杂 （Fe ₈₁ Ga ₁₉ ） _99.9 Tb _0.1 合金高 5.8% 和 5.6%。淬火处理后所有选定的 Fe-Ga 合金成分的饱和磁致伸缩比未淬火样品高 40% 以上。所有 Fe-Ga 合金的初始和平均磁致伸缩应变灵敏度 （dλ/dH） 在 1200 °C 下加热 2 小时后都得到了极大的提高。 本工作揭示了合理的合金设计和热处理可以有效增加Tb在基体中的溶解度，提高Fe-Ga合金的磁致伸缩性，可为磁致伸缩Fe-Ga合金的未来研究提供重要指导。