Y元素添加对FeCoSiB合金玻璃形成能力与磁性能的影响

Enhanced Glass-Forming Ability and Saturated Magnetization of FeCoSiB Through Y Addition

摘要:

非晶合金因具有优异的软磁性能，一直以来受到广泛的关注。随着现代科技的快速发展，材料的应用环境日益严苛，因此对其性能的要求也在不断提升。铁基非晶纳米晶软磁材料具有低矫顽力、低磁损耗、高饱和磁感应强度及超高的磁导率等特点，使其在电力电子、新能源汽车和高速电机等关键技术领域中得到广泛的应用。然而，铁基非晶纳米晶软磁材料的玻璃形成能力与饱和磁感应强度之间存在一定的相互制约关系，即材料的饱和磁感应强度越高，玻璃形成能力的可能性越降低。为提高铁基非晶纳米晶合金带材的玻璃形成能力及磁性能，采用铜锟甩带快淬工艺，成功制备了高铁含量的Fe基非晶纳米晶合金(Fe_0.8Co_0.2)_87-xSi₁B₁₂Y_x（x=0—20），同时研究了Y元素的添加量对该合金玻璃形成能力、晶化行为及退火前后磁性能的影响。结果表明，添加稀土元素Y，能够显著提高合金的玻璃形成能力。随着Y元素含量的增加，两个晶化放热峰之间的温度差（ΔT=T_x2-T_x1）逐渐增加，最大温度区间可达到189 K，说明Y元素扩展了可供后续热处理的温度范围，这有利于在退火过程中有效调控晶粒的尺寸。此外，Y元素的添加还提高了合金的纳米晶形成能力，合金的饱和磁感应强度可从1.71 T提升至1.88 T。高饱和磁感应强度的非晶纳米晶软磁合金展现出优异的综合性能，具有广泛的工程应用前景。

Abstract:

Amorphous alloys have long attracted attention due to their excellent soft magnetic properties. With the rapid advancement of modern technology， the environments in which materials used are becoming more and more demanding， leading to continuously optimized application requirements. Iron-based amorphous nanocrystalline soft magnetic materials， with their extremely low coercivity， magnetic loss， high saturation magnetic induction， and very high permeability， play a crucial role in key technological fields such as power electronics， new energy vehicles， and high-speed motors. However， a trade-off exists between the glass formation ability and the saturation magnetic induction strength of these materials； specifically， as saturation magnetic induction increases， the glass formation abilitytends to decrease. To improve both the glass formation ability and magnetic properties of Fe-based amorphous nanocrystalline alloy strips， a high iron content Fe-based amorphous nanocrystalline alloy was produced using the Cu Kun dump belt fast quenching process in （Fe_0.8Co_0.2）_87-xSi₁B₁₂Y_x （x=0—20） alloys. The effects of Y element addition on glass formation ability， crystallization behaviour， and magnetic properties before and after annealing were investigated. The results show that the addition of the rare earth element Y can effectively enhance the glass formation ability of the alloys. As the Y content increases， the temperature interval between the two crystallization exothermic peaks （△T=T_x2-T_x1） also increases， with a maximum temperature interval of 189 K. This indicates that Y element extends the temperature range available for subsequent heat treatments， facilitating effective regulation of the crystal size during annealing. It also suggests that the addition of Y element improves the nanocrystal formation ability of the alloy， and the saturation magnetic induction increases from 1.71 T to 1.88 T. These high saturation magnetic induction strength amorphous nanocrystalline soft alloys exhibit excellent comprehensive performance and hold significant potential for engineering applications.