Mo对Fe–Nb–B非晶热稳定性和软磁性能的影响

The Influence of Partial Replacement of Fe by Mo Element on Thermal Stability and Soft Magnetic Properties of the Fe–Nb–B Amorphous Alloys

摘要:

本文研究了Mo元素部分替代Fe元素对Fe–Nb–B非晶热稳定性和软磁性能的影响。结果表明，Fe基非晶的晶化过程与合金中Mo含量密切相关，当Mo含量为1 at.%和3 at.%时，合金经历两次晶化过程；而当Mo含量为5 at.%时，合金仅经历一次晶化过程。添加Mo元素能够有效提高Fe基非晶的玻璃化转变温度Tg和晶化起始温度Tx1。随着合金中Mo含量的增加，Fe基非晶的热稳定性显著改善，而非晶形成能力则略有降低。Fe70Nb6B23Mo1合金具有较低的玻璃化转变温度Tg (=830 K)和较宽的过冷液相区宽度ΔTx (=53 K)，具有最佳的非晶形成能力，与热力学参数PHS的预测结果相一致。Fe71-xNb6B23Mox (x=1, 3, 5)非晶薄带具有较高的饱和磁感应强度Ms和低的矫顽力Hc，Ms值为60–84 emu/g。Fe基非晶合金热稳定性的高低与其软磁性能具有一致性，即高热稳定性的非晶合金具有更优异的软磁性能。

Abstract:

The influence of partial replacement of Fe by Mo element on thermal stability and soft magnetic properties of the Fe–Nb–B amorphous alloys was investigated in detail. The results indicated that the crystallization behavior is dependent on the Mo content. It undergoes two-stage crystallization events for the alloys containing 1 at.% Mo and 3 at.% Mo, while it undergoes only single crystallization event for the alloys containing 5 at.% Mo. The addition of Mo element is benefit to increase the glass transition temperature Tg and onset crystallization temperature Tx1. As the Mo content increases, the thermal stability is enhanced and the glass forming ability (GFA) decreases slightly. The Fe70Nb6B23Mo1 alloy is found to reveal the largest GFA with low the glass transition temperature Tg (=830 K) and wide supercooled liquid region ΔTx (=53 K), which agrees well with that predicted by thermodynamic parameter PHS. The Fe71-xNb6B23Mox (x=1, 3, 5) amorphous ribbons show good soft magnetic properties with high saturation magnetization (Ms) and low coercivity (Hc), and the Ms value is in the range 60–84 emu/g. The Fe71-xNb6B23Mox (x=1, 3, 5) amorphous alloys exhibit a correspondence between thermal stability and soft magnetic properties.