Abstract Fe-based metallic glasses are known to have excellent soft magnetic properties, but restricted to the disastrous annealing embrittlement. A novel class of Fe84-xB14+x Zr2 (x = 0, 3, 6) metallic glasses with extraordinary annealing bending ductility and excellent soft magnetic properties were developed. The metallic glasses exhibit a high BS of 1.54–1.64 T and a low HC of 4.1–5.8 A/m. It is noteworthy that the Fe84B14Zr2 metallic glass exhibits the highest ductile to brittle transition temperature among all Fe-based metallic glasses reported to date and the ductile to brittle transition temperature decreases with the decrease of Fe content. Moreover, the well-distributed shear bands can still be formed during bending for Fe84B14Zr2 metallic glass after 680 K annealing. Pronounced β-relaxation peak has been observed for Fe84B14Zr2 metallic glass in its relaxation spectra. We demonstrate that the bending deformation ability is closely correlated to the β-relaxation. The underlying mechanism for the extraordinary bending deformation ability of Fe84B14Zr2 metallic glass after annealing can be attributed to the heterogeneous structure with plenty of loosely packed zones as revealed by the pronounced β-relaxation and high resolution transmission electron microscopy.

中文翻译：

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具有明显 β-弛豫的应力消除 Fe-Zr-B 金属玻璃的弯曲延展性

摘要 众所周知，铁基金属玻璃具有优异的软磁性能，但受限于灾难性的退火脆化。开发了一类具有非凡退火弯曲延展性和优异软磁性能的新型 Fe84-xB14+x Zr2 (x = 0, 3, 6) 金属玻璃。金属玻璃表现出 1.54-1.64 T 的高 BS 和 4.1-5.8 A/m 的低 HC。值得注意的是，Fe84B14Zr2 金属玻璃在迄今为止报道的所有 Fe 基金属玻璃中表现出最高的韧脆转变温度，并且韧脆转变温度随着 Fe 含量的降低而降低。此外，Fe84B14Zr2 金属玻璃在680 K 退火后在弯曲过程中仍可形成分布均匀的剪切带。在 Fe84B14Zr2 金属玻璃的弛豫光谱中观察到明显的 β 弛豫峰。我们证明弯曲变形能力与β松弛密切相关。Fe84B14Zr2 金属玻璃在退火后具有非凡的弯曲变形能力的潜在机制可归因于具有大量松散堆积区的异质结构，如明显的 β-弛豫和高分辨率透射电子显微镜所揭示的。