摘要
铁基非晶合金因其低矫顽力、高磁导率和低铁耗等被广泛应用于变压器、电抗器等电力电子领域,然而,较低的饱和磁感值限制了其进一步应用.铁含量增大可有效提高合金的饱和磁感,但相应非磁性元素含量的降低又将引起合金非晶形成能力的下降,导致后续纳米晶带材的软磁性能及弯折韧性的恶化.针对上述问题,文章基于金属-类金属间的杂化作用,通过原子百分比为7%的B替代P,利用单辊甩带法制备了厚度约为25μm的FePBCCu非晶薄带,并研究了B添加对薄带非晶形成能力、磁性能和力学性能的影响.热动力学行为揭示出小原子B添加能够降低合金结构的异质性,有效提高非晶基体的热稳定性;熔化与凝固曲线表明B元素能够促使合金系接近共晶成分且具有较大的过冷度.因此合金的非晶形成能力显著提高,其临界厚度从基体的约21μm提高到约30μm.B添加促使合金系磁性原子有效磁矩的增大,导致非晶薄带的饱和磁感值增大.纳米压痕实验结果表明,B添加合金的约化模量值较大且在一个较小范围内波动,这与合金的结构均匀性密切相关.
Fe-based amorphous alloys are widely used in power electronics fields such as transformers and reactors due to their low coercivity,high permeability and low loss.However,the relatively low saturation magnetization(Bs)limits their further applications.Generally speaking,the adjustable magnetic Fe content as an effective strategy can ameliorate the magnetic properties,and the higher the Fe content,the higher the obtained Bs is,but the decrease of the corresponding non-magnetic element content will result in the drop of the ability of alloys to form amorphous phase,leading to the deterioration of the magnetic softness and bending ductility of nanocrystalline alloys.To address this critical issue,in this work,based on the metal-metalloid hybridization,the FePBCCu amorphous ribbons,each with a thickness of~25μm,are prepared by the single-roller melt spinning method via 7%(atomic percent)B substitution for P,and the effects of B element addition on the ability to form amorphous phase,magnetic properties and mechanical properties of ribbons are investigated.Thermodynamic behavior shows that the addition of small quantities of B element can reduce the structural heterogeneity of alloy and the crystallization driving force as well,thus effectively improving the thermal stability of the amorphous matrix.The melting and solidification curves show that the addition of B can promote alloy to approach to the eutectic composition,and there is a large degree of undercooling.As a result,the critical thickness of ribbons increases from~21μm for B-free alloy to~30μm for B-added alloy due to the micro-alloying effect.The addition of B increases the effective magnetic moment of magnetic atoms in alloy,resulting in the increase of the saturation magnetization.Furthermore,the results of nanoindentation tests show that the modulus value of the B-added alloy decreases greatlyr and fluctuates in a smaller range than that of the B-free alloy,which is closely associated with the structural uniformity of the alloy.
作者
孙吉
沈鹏飞
尚其忠
张鹏雁
刘莉
李明瑞
侯龙
李维火
Sun Ji;Shen Peng-Fei;Shang Qi-Zhong;Zhang Peng-Yan;Liu Li;Li Ming-Rui;Hou Long;Li Wei-Huo(Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials,Ministry of Education,School of Materials Science and Engineering,Anhui University of Technology,Ma’anshan 243002,China;School of Metallurgical Engineering,Anhui University of Technology,Ma’anshan 243002,China)
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2023年第2期200-208,共9页
Acta Physica Sinica
基金
安徽省自然科学基金青年项目(批准号:2208085QE121)
安徽省高等学校自然科学研究项目(批准号:KJ2020A0225,KJ2020A0272)
江苏省基础研究计划(批准号:BK20201282)
先进金属材料绿色制备与表面技术教育部重点实验室开放基金(批准号:GFST2020KF05)资助的课题。
关键词
铁基非晶薄带
非晶形成能力
饱和磁感
约化模量
Fe-based amorphous ribbon
amorphous forming ability
saturation magnetization
reduced modulus
