Soft magnetic nanocrystalline alloys, exemplified by FINEMET (Fe_73.5Si_13.5B₉Nb₃Cu₁), are essential in electronics due to their low coercivity and high permeability. However, demand for miniaturization and enhanced efficiency in power conversion devices necessitates materials with increased saturation magnetization. Given the limited saturation magnetization (1.23 T) of FINEMET alloy, which is attributed to its lower iron content, there has been growing interest in exploring alternative alloys that potentially offer higher saturation magnetization values. The present research introduces a new alloy system that builds on FINEMET by increasing the iron content and meticulously incorporating Nb and Zr in a controlled manner, aiming for a composition that delivers enhanced soft magnetic properties. Alloy ribbons with a newly designed composition of Fe_77.5Si_11.5B₇Nb_xZr_3-xCu₁ (x=0-3 at.%) were fabricated via rapid-quenching melt spinning followed by nanocrystallization thermal annealing, and the impact of Nb/Zr content on the magnetic microstructure and magnetic properties was investigated. Strategically distributing both Zr and Nb has been found to effectively suppresses grain growth, enhancing permeability and reducing coercivity and core loss. Remarkably, the Fe_77.5Si_11.5B₇Nb₁Zr₂Cu₁ nanocrystalline ribbon annealed at 580 °C for 10 minutes demonstrates outstanding soft-magnetic properties with a coercivity of 1.64 A/m and a saturation magnetization of 170.31 emu/g (1.59 T). Furthermore, a high-resolution TEM analysis revealed an impressively small average crystal size of 9.69 nm. It is anticipated that Fe_77.5Si_11.5B₇Nb_xZr_3-xCu₁ (x=0-3 at.%) soft magnetic alloys will be broadly applied in power conversion devices such as inductors and transformers, contributing significantly to efficiency and performance enhancements.

中文翻译：

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Nb/Zr共加成对Fe77.5Si11.5B7NbxZr3-xCu1纳米晶合金组织及软磁性能的影响


以 FINEMET （Fe_73.5Si_13.5B₉Nb₃Cu₁） 为代表的软磁纳米晶合金由于其低矫顽力和高磁导率而在电子产品中是必不可少的。然而，功率转换器件对小型化和更高效率的需求需要具有更高饱和磁化强度的材料。鉴于 FINEMET 合金的饱和磁化强度 （1.23T） 有限，这是由于其较低的铁含量，人们对探索可能提供更高饱和磁化值的替代合金的兴趣越来越大。本研究引入了一种新的合金系统，该系统建立在 FINEMET 的基础上，通过增加铁含量并以受控方式精心加入 Nb 和 Zr，旨在获得增强软磁性能的成分。通过快速淬火熔融纺丝后纳米化热退火制备了新设计的 Fe_77.5Si_11.5B₇Nb_xZr_3-xCu₁ （x=0-3 at.%） 的合金带，并研究了 Nb/Zr 含量对磁性微观结构和磁性能的影响。研究发现，战略性地分布 Zr 和 Nb 可有效抑制晶粒生长、增强渗透性并减少矫顽力和核心损失。值得注意的是，在 580 °C 下退火 10 分钟的 Fe_77.5Si_11.5B₇Nb₁Zr₂Cu₁ 纳米晶带表现出出色的软磁性能，矫顽力为 1.64A/m，饱和磁化强度为 170.31emu/g （1.59T）。此外，高分辨率 TEM 分析揭示了令人印象深刻的 9.69nm 平均晶体尺寸。预计 Fe_77.5Si_11.5B₇Nb_xZr_3-xCu₁ （x=0-3 at.%） 软磁合金将广泛应用于电感器和变压器等功率转换器件中，为效率和性能的提高做出重大贡献。