【摘要】 四方型RE₆（Fe, Ga）₁₄相作为“高Ga低B”永磁材料中的特征晶界相，有效提高了无重稀土钕铁硼烧结磁体的矫顽力，但该相对磁体抗腐蚀性能的影响仍缺乏研究。通过调控Nd-Dy-Fe-Ga-B磁体中Ga和B元素含量，制备了2种不同晶界相组成的烧结磁体，对比了二者磁性能及抗腐蚀性能的差异，并重点分析了RE₆（Fe, Ga）₁₄晶界相的腐蚀行为。研究发现，在w（Ga）=0.5%,w（B）=0.9%的回火态磁体中形成大量的RE₆（Fe, Ga）₁₄晶界相，相较于传统富稀土晶界相为主的w（Ga）=0.1%,w（B）=1.0%磁体来说，前者拥有更高的矫顽力及更强的抗腐蚀性能。原位腐蚀观察进一步证实，RE₆（Fe, Ga）₁₄相可有效减缓烧结磁体晶界的腐蚀进程，为高综合服役性能的烧结钕铁硼磁体设计提供了重要参考。更多还原

【Abstract】 As the characteristic grain boundary phase of the “Ga-rich/B-poor” Nd-Fe-B sintered permanent magnets, the tetragonal RE₆（Fe, Ga）₁₄ intergranular phase enhances the coercivity via enhanced decoupling capability to isolate the adjacent RE₂Fe₁₄B matrix phase, hence attracting widespread research attention. However, the influence of RE₆（Fe, Ga）₁₄ phase on the corrosion resistance still remains unexplored. In this work, two Nd-Dy-Fe-Ga-B sintered magnets dominated by different intergranular phases were prepared and compared by adjusting the Ga and B contents. Compared to the magnet with w（Ga）=0.1% and w（B）=1% dominated by the conventional RE-rich intergranular phase, a substantial amount of RE₆（Fe, Ga）₁₄ intergranular phase was introduced in the annealed magnet with w（Ga）=0.5% and w（B）=0.9%, yielding higher coercivity and corrosion resistance. In-situ corrosion experiments further confirmed that the RE₆（Fe, Ga）₁₄ intergranular phase effectively mitigates the corrosion process, offering a promising pathway for simultaneously improved magnetic and anti-corrosion performance of RE-Fe-B sintered magnets.更多还原