Abstract New Fe82-85B13-16Si1Cu1 amorphous alloys with low B content and high B/Si content ratios were synthesized by melt spinning for developing good soft magnetic and high strength materials. The crystallization occurs through two stages and the first-stage onset temperature increases from 673 K to 705 K with increasing B content, while the second-stage temperature remains nearly constant. The first and second stages are due to the precipitation of the α-Fe(Si) phase with a size of about 30 nm and the decomposition of the remaining amorphous phase to α-Fe(Si)+Fe3B+Fe2B, respectively. The Fe-based alloys exhibited good soft magnetic properties both in annealed amorphous and nanocrystallized amorphous+α-Fe(Si) phases. The saturated magnetic flux density, coercivity and permeability at 1 kHz are 1.7 T, 4.92 A/m and 7100, respectively, for the annealed amorphous 14B alloy and 1.74 T, 5.62 A/m and 10100, respectively, for the nanocrystallized 13B alloy. The Vickers hardness (Hv) is 803–867 for the as-spun state and it increases with decreasing B content. The Hv increases significantly by crystallization to α-Fe+amorphous phases and reaches 997–1550 for the alloys annealed at 693–763 K just before Tx2. The ultrahigh Hv is presumably due to the combination of fine nanoscale mixed phases, high volume fraction of α-Fe(Si) without internal defects and the enrichment of B into the remaining amorphous phase. Such ultrahigh Hv has not been obtained for Fe-based amorphous and crystallized alloys before and the addition of 1%Cu is essential for the ultrahigh Hv and the amorphous phase formation for the Fe-rich 85%Fe alloy. The new Fe-based alloys are encouraging as future soft magnetic and ultrahigh strength materials with low material cost.

中文翻译：

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Fe82-85B13-16Si1Cu1非晶合金纳米晶化、良好的软磁性能和超高的机械强度

摘要 为开发良好的软磁和高强度材料，采用熔融纺丝法合成了新型的低B、高B/Si比Fe82-85B13-16Si1Cu1非晶合金。结晶分两个阶段进行，随着 B 含量的增加，第一阶段的起始温度从 673 K 增加到 705 K，而第二阶段的温度几乎保持不变。第一和第二阶段分别是由于尺寸约为 30 nm 的 α-Fe(Si) 相的沉淀和剩余的非晶相分解为 α-Fe(Si)+Fe3B+Fe2B。Fe基合金在退火非晶和纳米晶非晶+α-Fe(Si)相中均表现出良好的软磁性能。1 kHz时的饱和磁通密度、矫顽力和磁导率分别为1.7 T、4.92 A/m和7100，对于退火的非晶 14B 合金和 1.74 T，分别为 5.62 A/m 和 10100，对于纳米晶化 13B 合金。初纺状态的维氏硬度 (Hv) 为 803-867，并且随着 B 含量的降低而增加。通过结晶成 α-Fe+非晶相，Hv 显着增加，并且在 Tx2 之前在 693-763 K 下退火的合金达到 997-1550。超高 Hv 可能是由于精细纳米级混合相、无内部缺陷的高体积分数 α-Fe(Si) 以及 B 富集到剩余的非晶相中的组合。此前，铁基非晶合金和结晶合金还没有获得过这样的超高 Hv，添加 1%Cu 对于超高 Hv 和富铁 85%Fe 合金的非晶相形成是必不可少的。