Anomalous Precipitation of the γ-Fe Phase in Fe-Based Nanocrystalline Alloys and Its Impact on Soft Magnetic Properties

You Wu, Lingxiang Shi, Ranbin Wang, Jili Jia, Wenhui Guo, Yunshuai Su, Hengtong Bu, Siqi Xiang, Weihong Yang, Mingli Fu, Yang Shao*, Kefu Yao*

*此作品的通讯作者

科研成果: 期刊稿件文章同行评审

摘要

High-Cu-content (Cu-content > 1.3 at.%) nanocrystalline alloys exhibit wide heat-treatment windows and favorable soft magnetic properties due to the presence of pre-existing α-Fe nanocrystals. By fabricating ribbons with varying thicknesses to tailor cooling rates, distinct structural characteristics were achieved in Fe82B16.5Cu1.5 alloy ribbons. Notably, the face-centered cubic (fcc) γ-Fe phase was identified in Fe-based nanocrystalline alloys. The precipitation of the fcc γ-Fe phase originates from a phase-selection mechanism under specific cooling conditions, while its retention in the as-quenched ribbon with a thickness of 27 μm is attributed to kinetic suppression during rapid cooling and the nanoscale stabilization effect. The formation of the fcc γ-Fe phase significantly reduced the saturation flux density (Bs) and increased coercivity (Hc), concurrently destabilizing the residual amorphous matrix. By suppressing the precipitation of the γ-Fe and Fe3B phases through precise control of ribbon thickness and annealing parameters, the alloy ribbon with a thickness of 16 μm achieved an optimal combination of Bs (1.82 T) and Hc (8.3 A/m). These findings on anomalous fcc γ-Fe phase precipitation provide novel insights into metastable phase engineering and offer structural design guidelines for alloys containing pre-existing α-Fe nanocrystals.

源语言英语
文章编号2867
期刊Materials
18
12
DOI
出版状态已出版 - 6月 2025
已对外发布

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