Abstract In this paper, the Ce-Fe-B and (La, Ce)-Fe-B strips were prepared by strip-casting technique and the multi-phases RE-Fe-B (RE = La, Ce, Pr and Nd) magnets were fabricated by dual-alloy method with (Pr, Nd)-Fe-B alloy. The effects of La substitution for Ce on the microstructure of Ce-Fe-B strip-casting alloy were investigated, especially for the formability of 2:14:1 phase. The results showed that the proportion of RE2Fe14B phase significantly increased from 0.0% to 48.0% and the CeFe2 phase drastically decreased from 67.1% to 38.1% with La substitution for 35 wt% Ce in Ce-Fe-B strip-casting alloy. It could be attributed to the enlarged temperature gap between the formation of 2:14:1 phase and Ce2Fe17 phase, which was beneficial for the formability of 2:14:1 phase. Owing to the rise of the proportion of the 2:14:1 phase, the remanence (Br) and maximum energy product ((BH)max) of dual-alloy magnets increased from 11.49 kGs, 28.68 MGOe to 12.38 kGs, 34.76 MGOe with respect to 32.0 wt% Ce or La-Ce substitution content for Pr-Nd, respectively. Meanwhile, the coercivity (Hcj) slightly decreased from 6.49 kOe to 6.16 kOe, which was caused by the decrease of HA (54.09 kOe → 42.37 kOe) and the deterioration of microstructure of the magnet. This work indicated that the cost-effective La-contained RE-Fe-B permanent magnets could be prepared by dual-alloy method.

中文翻译：

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用 La 替代 Ce 显着改善多相 RE-Fe-B 磁体的 2:14:1 相形成性和磁性能

摘要 本文采用带材连铸技术制备了Ce-Fe-B和(La, Ce)-Fe-B带材和多相RE-Fe-B (RE = La, Ce, Pr和Nd)磁体是通过双合金方法与 (Pr, Nd)-Fe-B 合金制成的。研究了 La 替代 Ce 对 Ce-Fe-B 带材铸造合金显微组织的影响，特别是对 2:14:1 相的成形性的影响。结果表明，在Ce-Fe-B带状铸造合金中，用La替代35wt%的Ce，RE2Fe14B相的比例从0.0%显着增加到48.0%，CeFe2相从67.1%急剧下降到38.1%。这可能归因于 2:14:1 相和 Ce2Fe17 相形成之间的温度差距扩大，这有利于 2:14:1 相的可成形性。由于2:14:1相的比例上升，双合金磁体的剩磁 (Br) 和最大能量积 ((BH)max) 从 11.49 kGs、28.68 MGOe 增加到 12.38 kGs、34.76 MGOe，相对于 Pr-Nd 的 32.0 wt% Ce 或 La-Ce 替代含量， 分别。同时，矫顽力 (Hcj) 从 6.49 kOe 略微下降到 6.16 kOe，这是由于 HA 的降低 (54.09 kOe → 42.37 kOe) 和磁体微观结构的恶化。这项工作表明，可以通过双合金方法制备具有成本效益的含 La 的 RE-Fe-B 永磁体。这是由于 HA (54.09 kOe → 42.37 kOe) 的降低和磁体微观结构的恶化造成的。这项工作表明，可以通过双合金方法制备具有成本效益的含 La 的 RE-Fe-B 永磁体。这是由于 HA (54.09 kOe → 42.37 kOe) 的降低和磁体微观结构的恶化造成的。这项工作表明，可以通过双合金方法制备具有成本效益的含 La 的 RE-Fe-B 永磁体。