Abstract Iron-based soft magnetic alloys (FeSiB, FeSiBNb, FeSiBCu, and FeSiBNbCu (Finemet)) have been fabricated via mechanical alloying followed by spark plasma sintering (SPS) process. FeSiB alloy powder was obtained by high energy ball milling of an elemental blend Fe, Si, and B powders. The effect of milling time on crystallite size and phase transformation was studied. Additionally, FeSiBCu, FeSiBNb, and FeSiBCuNb alloy powders were milled to study the effect of Cu and Nb on phase transformation, mechanical, and magnetic behavior. The mechanically alloyed powders were sintered via SPS process to achieve full densification. The microhardness and magnetic permeability of sintered FeSiB alloys were found to be increased monotonically with milling time primarily due to the smaller crystallite size and more uniform microstructure. Interestingly, the alloying of Cu or (and) Nb to FeSiB resulted in higher saturation magnetization and lower coercivity mainly due to large volume fraction of α-Fe3Si nanocrystals. Overall, these alloys exhibit reasonably good soft magnetic behavior along with excellent microhardness. Mechanical alloying followed by spark plasma sintering opens up a new avenue of processing amorphous-nanocrystalline alloys into bulk shape with good mechanical and magnetic properties.

中文翻译：

---

体纳米放电等离子烧结Fe-Si-B-Cu-Nb基磁性合金

摘要 铁基软磁合金（FeSiB、FeSiBNb、FeSiBCu 和 FeSiBNbCu (Finemet)）是通过机械合金化和放电等离子烧结 (SPS) 工艺制造的。FeSiB 合金粉末是通过高能球磨对 Fe、Si 和 B 元素混合物进行高能球磨而获得的。研究了球磨时间对微晶尺寸和相变的影响。此外，还研磨了 FeSiBCu、FeSiBNb 和 FeSiBCuNb 合金粉末，以研究 Cu 和 Nb 对相变、机械和磁性能的影响。机械合金化粉末通过 SPS 工艺烧结以实现完全致密化。发现烧结 FeSiB 合金的显微硬度和磁导率随着铣削时间单调增加，主要是由于更小的微晶尺寸和更均匀的微观结构。有趣的是，Cu 或（和）Nb 与 FeSiB 的合金化导致更高的饱和磁化强度和更低的矫顽力，这主要是由于 α-Fe3Si 纳米晶体的体积分数大。总的来说，这些合金表现出相当好的软磁性能以及优异的显微硬度。机械合金化和放电等离子烧结开辟了将非晶纳米晶合金加工成具有良好机械和磁性能的块体形状的新途径。