Abstract LaCe-based sintered magnets with different microstructural features and distinct rare earth elemental distribution were designed by dual-alloy method. The sample prepared by fine LaCe-containing powder and coarse LaCe-free powder possesses higher remanence (∼13.41 kGs), whereas another sample prepared by fine LaCe-free powder and coarse LaCe-containing powder possesses higher coercivity (∼5.67 kOe). Additionally, these samples are with the same nominal compositions and their elemental distribution features are obviously different in matrix grains respectively. Their remanence difference is mainly affected by the saturation magnetization difference caused by the distribution variation of the rare earth elements at the matrix phase. The coercivity difference is affected by the component of the grain boundary phase between the adjacent grains and the distribution variation of the rare earth elements at the matrix phase. This findings may provide a new prospect for the high utilization of LaCe misch-metal in 2:14:1-type permanent magnets.

中文翻译：

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La-Ce 混合金属取代 2:14:1 型烧结磁体的双合金法显微结构设计

摘要 采用双合金法设计了具有不同显微结构特征和独特稀土元素分布的LaCe基烧结磁体。由细的含 LaCe 粉末和粗的无 LaCe 粉末制备的样品具有更高的剩磁（~13.41 kGs），而由细的无 LaCe 粉末和粗的含 LaCe 粉末制备的另一个样品具有更高的矫顽力（~5.67 kOe）。此外，这些样品具有相同的标称成分，它们的元素分布特征分别在基体晶粒中明显不同。它们的剩磁差主要受稀土元素在基体相分布变化引起的饱和磁化强度差的影响。矫顽力差异受相邻晶粒间晶界相的成分和稀土元素在基体相中分布变化的影响。这一发现可能为 LaCe 混合稀土在 2:14:1 型永磁体中的高利用率提供了新的前景。