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Zongqi Xiao, Xingyu Zhou, Xin Zhang, Qikun Huang, Li Cai, and Yan Wang, Characterization and properties of soft magnetic (Fe0.5Co0.5)75B21Nb4 metallic glasses subjected to cryogenic treatment and relaxation annealing, Int. J. Miner. Metall. Mater.,(2025). https://dx.doi.org/10.1007/s12613-024-3084-4
Zongqi Xiao, Xingyu Zhou, Xin Zhang, Qikun Huang, Li Cai, and Yan Wang, Characterization and properties of soft magnetic (Fe0.5Co0.5)75B21Nb4 metallic glasses subjected to cryogenic treatment and relaxation annealing, Int. J. Miner. Metall. Mater.,(2025). https://dx.doi.org/10.1007/s12613-024-3084-4
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低温处理和弛豫退火态 (Fe0.5Co0.5)75B21Nb4 软磁非晶合金的性能与表征

摘要: 本文研究了低温处理(CT)和弛豫退火处理(AT)对旋淬态(Fe0.5Co0.5)75B21Nb4非晶合金局域原子排布(dm)、热力学稳定性、软磁性能、显微硬度(Hv)和耐腐蚀性的影响。在保持合金完全非晶态的前提下,通过适当的CT和AT工艺实现了提升饱和磁化强度和降低矫顽力效果的兼得,其中213K的浅CT优化软磁性能的效果最佳。另外,得益于(Fe0.5Co0.5)75B21Nb4非晶合金较低的形核激活能与较高的晶粒生长激活能,合适的CT还可提升其生成均匀退火纳米晶组织的潜力。通过分析自由体积和原子势能的关系,本研究发现非晶的Hc可能与其体积在不同CT条件下的膨胀与收缩行为有强相关性。对结果拟合得到的HcdmMsHv 关系式表明,软磁性能参数和非晶的自由体积含量、随机密排程度之间存在强线性相关关系。另外,在3.5 wt% NaCl溶液介质中的电化学腐蚀试验中观察到更稳定的富Nb钝化层的形成,这表明适当的AT和CT也有助于提升非晶的耐点蚀性能。

 

Characterization and properties of soft magnetic (Fe0.5Co0.5)75B21Nb4 metallic glasses subjected to cryogenic treatment and relaxation annealing

Abstract: The effect of cryogenic treatment (CT) and relaxation annealing on the average nearest neighboring distance of atom (dm), thermodynamic stability, soft magnetic properties, microhardness (Hv), and corrosion resistance of as-spun (Fe0.5Co0.5)75B21Nb4 metallic glasses (MGs) is studied. On the premise of maintaining a fully amorphous phase, appropriate CT and relaxation annealing are conducive to achieving the synergistic effect of increasing saturation magnetization (Ms) and reducing coercivity (Hc). Shallow CT at 213 K optimally enhances the soft magnetic properties of MGs. Given its low activation energy of nucleation and increased activation energy of growth, appropriate CT is beneficial for achieving uniform annealed nanocrystals in amorphous phases. The correlation between free volumes (FVs) and potential energy suggests that the variation in Hc depends on the expansion and contraction behavior of amorphous phases after different CT processes. The fitting formulas of Hcdm and MsHv correlations demonstrate that soft magnetic parameters have a solid linear relationship with the contents of FVs and degree of dense random packing. Moreover, pitting resistance is improved by appropriate CT and relaxation annealing. This improvement is characterized by the promotion of the stability of the Nb-rich passive film formed during electrochemical corrosion in 3.5wt% NaCl solution.

 

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