Abstract The influence of mechanical alloying (MA) and spark plasma sintering (SPS) processing parameters on the microstructure, magnetic and mechanical properties of Finemet (Fe73.5Cu1Nb3Si13.5B9) type alloys was investigated. Finemet alloy powder was obtained via mechanical alloying of elemental powders for 30 h, 60 h, 90 h, and 120 h with ball to powder ratio (BPR) of 10:1 and 15:1. The milled powders were consolidated using the SPS process. The XRD patterns confirm the presence of the α-Fe3Si phase in all Finemet alloys, also broadening of the (110) peak of α-Fe3Si was observed with increasing milling time. The microhardness of Finemet alloys increases with increase in milling time primarily due to a decrease in grain size. All samples show good saturation magnetization (Ms), 120h sample exhibiting the highest Ms of 166 emu/g, however coercivity increases with increasing milling time. Additionally, α-Fe3Si crystal size decreases with increasing the BPR primarily due to higher impact energy.

中文翻译：

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Fe-Si-B-Cu-Nb / Finemet 基合金的放电等离子烧结

摘要 研究了机械合金化 (MA) 和放电等离子烧结 (SPS) 工艺参数对 Finemet (Fe73.5Cu1Nb3Si13.5B9) 型合金的显微组织、磁性和机械性能的影响。Finemet 合金粉末通过元素粉末机械合金化 30 小时、60 小时、90 小时和 120 小时获得，球粉比 (BPR) 为 10:1 和 15:1。研磨后的粉末使用 SPS 工艺进行固结。XRD 图案证实了所有 Finemet 合金中都存在 α-Fe3Si 相，而且随着研磨时间的增加，观察到 α-Fe3Si 的 (110) 峰变宽。Finemet 合金的显微硬度随着铣削时间的增加而增加，这主要是由于晶粒尺寸的减小。所有样品均显示出良好的饱和磁化强度 (Ms)，120 小时样品的最高 Ms 为 166 emu/g，然而矫顽力随着研磨时间的增加而增加。此外，主要由于较高的冲击能量，α-Fe3Si 晶体尺寸随着 BPR 的增加而减小。