Abstract

The effects of minor alloying addition of Cu on the glass-forming ability and crystallization process of Fe_71.7−xB_16.7Si_8.3Zr_3.3Cu_x and Fe_72.5−xB_16.7Si_8.3Hf_2.5Cu_x (x = 0, 0.3, 0.7, 1.0 and 1.3; at%) alloys were investigated. It was found that the critical glass formation size of rod samples gradually decreased from 2.5 to 1 mm with increasing Cu content in these alloys. Single α-Fe phase nanocrystalline alloys were obtained after isothermal annealing the Fe–B–Si–Zr/Hf–Cu glassy alloys containing 0.7–1.0 at% Cu. The Fe₇₁B_16.7Si_8.3Zr_3.3Cu_0.7 alloy exhibited good soft magnetic properties with a high saturation magnetization (~ 1.22 T) and a low coercive force (~ 0.6 A/m) after annealing at 853 K for 10 min due to the precipitation of α-Fe nanoparticles of 8 nm size in the glassy matrix. The structural evolution on annealing and the variation tendencies against Cu content of the glass transition temperature, thermal stability and glass-forming ability of the Fe–B–Si–Zr/Hf–Cu amorphous alloys were discussed using a dual-cluster local structure model.

Graphic Abstract

中文翻译：

---

具有高玻璃形成能力的 Fe-B-Si-Zr/Hf-Cu 纳米晶合金的制备和软磁性能

摘要

Cu的微量合金化对Fe _71.7-x B _16.7 Si _8.3 Zr _3.3 Cu _x和Fe _72.5-x B _16.7 Si _8.3 Hf _2.5 Cu _x (x = 0, 0.3, 0.7、1.0 和 1.3；at%) 合金进行了研究。结果表明，随着这些合金中铜含量的增加，棒状样品的临界玻璃形成尺寸从 2.5 毫米逐渐减小到 1 毫米。在对含有 0.7-1.0 at% Cu 的 Fe-B-Si-Zr/Hf-Cu 玻璃态合金进行等温退火后，获得了单一的α -Fe 相纳米晶合金。Fe ₇₁ B_16.7 Si _8.3 Zr _3.3 Cu _0.7合金表现出良好的软磁性能，在 853 K 下退火 10 分钟后，由于α -玻璃基体中 8 nm 大小的 Fe 纳米粒子。使用双簇局部结构模型讨论了退火时的结构演变以及 Fe-B-Si-Zr/Hf-Cu 非晶合金的玻璃化转变温度、热稳定性和玻璃形成能力随 Cu 含量的变化趋势.

图形摘要