Fe_(73.5)Si_(13.5)B_(9)Cu_(1)Nb_(3)非晶合金的高温氧化和晶化机理  

High-temperature oxidation and crystallization mechanism of Fe_(73.5)Si_(13.5)B_(9)Cu_(1)Nb_(3)amorphous alloy

作　　者：张响 宋英杰 刘海顺[1] 熊翔[2] 杨卫明 韩陈康 ZHANG Xiang;SONG Yingjie;LIU Haishun;XIONG Xiang;YANG Weiming;HAN Chenkang(School of Materials Science and Physics,China University of Mining and Technology,Xuzhou 221116,China;State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China;School of Mechanics and Civil Engineering,China University of Mining and Technology,Xuzhou 221116,China)

机构地区：[1]中国矿业大学材料与物理学院,徐州221116 [2]中南大学粉末冶金国家重点实验室,长沙410083 [3]中国矿业大学力学与土木工程学院,徐州221116

出　　处：《物理学报》2025年第8期254-262,共9页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:52304388,52371167);中南大学粉末冶金国家重点实验室基金(批准号:Sklpm-KF-008)资助的课题.

摘　　要：铁基非晶合金具有高的饱和磁感应强度及低的矫顽力和损耗,是高频变压器和扼流圈铁芯等器件的理想材料.然而,该类合金晶化温度低并容易氧化,其在高温环境中的应用受到限制.铜和铌的添加可抑制晶核长大、提高热稳定性,但对合金的高温抗氧化性能及结构演化的影响尚不明确.本文利用静态空气氧化实验研究了Fe_(73.5)Si_(13.5)B_(9)Cu_(1)Nb_(3)非晶合金高温氧化后微纳尺度结构的演变及其对合金性能的影响.微纳结构演化揭示硅和铌在650℃氧化过程中快速扩散至氧化区域并形成致密氧化层,进而阻碍氧元素向合金内部扩散;合金内部则形成以铁元素为主的α-Fe(Si)相,其晶粒尺寸随着氧化时间而缓慢长大.热动力学行为表明氧化过程中硅和铌的偏析能提高合金体系热力学稳定性,抑制晶化过程中形成多种金属间化合物.磁滞回线结果表明,经650℃氧化后,合金的饱和磁感应强度保持不变;同时,氧化时间为5 min时,矫顽力约为0.3 Oe,氧化时间延长至0.5 h后,矫顽力逐渐增大至61 Oe.Fe-based amorphous alloys are widely used in electronic devices such as high-frequency transformers and choke cores due to their low coercivity,low loss,and high saturation magnetic induction intensity.However,these alloys have a relatively low crystallization temperature and are prone to oxidation,which limits their applications in high-temperature environments.The addition of copper and niobium elements can suppress the growth of crystal nuclei and improve thermal stability.However,the influences on the alloy's high-temperature oxidation resistance and structural evolution are still unclear.In this work,static air oxidation is used to investigate the microstructure evolution of Fe_(73.5)Si_(13.5)B_(9)Cu_(1)Nb_(3)amorphous alloy after high-temperature oxidation and its influence on magnetic properties.Besides,long-time oxidation,say,3000 hours or longer at 500℃,is generally hard to perform in the laboratory.Thus,the Van’t Hoff’s rule is used to evaluate outcomes under the condition of the long-time and relatively low-temperature oxidation through using rapid hightemperature oxidation.Based on Van’t Hoff’s rule,the oxidation at 650℃for 5 min will show similar or more severe oxidation effects on the microstructure of Fe_(73.5)Si_(13.5)B_(9)Cu_(1)Nb_(3)alloy after oxidation at 500℃for 2730 h.The microstructure evolution reveals that silicon and niobium in this alloy will quickly diffuse toward the sample surface during oxidation at 650℃,and these two elements will form a dense layer to impede oxygen diffusion.Meanwhile,anα-Fe(Si)phase,mainly composed of iron elements,will be generated in the alloy,with its grain size slowly increasing in the oxidation process.Thermodynamic analysis indicates that the segregation of silicon and niobium can preserve the thermodynamic stability of the alloy system during oxidation and suppress the formation of intermetallic compounds during crystallization.The magnetic hysteresis loop results show that the coercivity of Fe_(73.5)Si_(13.5)B_(9)Cu_(1)Nb_(3)alloy after 5

关 键 词：铁基非晶合金 高温氧化 晶化机理 磁性能 

分 类 号：TG132[一般工业技术—材料科学与工程]