Microstructures and Magnetic Property of FeZrMoB（Cu） Alloys AITranslate

［1］（杨雨诗，何琦，徐晨阳，韩非，刘亿，侯泽然，闵峻英. 激光热处理对超高强度钢弯曲性能的影响［J］. 锻压技术，2024，49（7）：97.）

Y S Yang，Q He，C Y Xu，F Han，Y Liu，Z R Hou，J Y Min. Effect of laser heat treatment on bending properties of ultra-high strength steel［J］. Forging & Stamping Technology，2024，49（7）：97.

［2］（王欢龙，岳重祥，张志建，周洪宝. 22MnB5超高强度热冲压成形钢的开发及应用［J］. 塑性工程学报，2024，31（1）：195.）

H L Wang，C X Yue，Z J Zhang，H B Zhou. Development and application of 22MnB5 ultra high strength hot stamping steel［J］. Journal of Plasticity Engineering，2024，31（1）：195.

［3］（江鸿，任海军，刘航. 热变形对Inconel 690合金微观组织及耐腐蚀性能的影响［J］. 塑性工程学报，2023，30（12）：138.）

H Jiang，H J Ren，H Liu. Effect of hot deformation on microstructure and corrosion resistance properties of Inconel 690 alloy［J］. Journal of Plasticity Engineering，2023，30（12）：138.

［4］（肖天成，邹存磊，张爽，李长鸣，曲晚勤，王峻赫，董闯. 高强导电耐磨 Cu-Fe-C 复合材料的设计与制备［J］. 铜业工程，2024，（5）：97.）

T C Xiao，C L Zou，S Zhang，C M Li，W Q Qu，J H Wang，C Dong. Design and preparation of high strength electrical conductive and wear resisting Cu-Fe-C composites［J］. Copper Engineering，2024，（5）：97.

［5］Jason D，Wael M B，Lluisa E，Sunol J J. Characterization and analysis of nanocrystalline soft magnetic alloys：Fe based［J］. Metals，2021，11（12）：1896.

［6］Xiao H，Wang A D，Li J W，He A N，Liu T，Dong Y Q，Guo H，Liu X C. Structural evolutionary process and interrelation for FeSiBNbCuMo nanocrystalline alloy［J］. Journal of Alloys and Compounds，2020，821：153487.

［7］（姚可夫，施凌翔，陈双琴，邵洋，陈娜，贾蓟丽. 铁基软磁非晶/纳米晶合金研究进展及应用前景［J］. 物理学报，2018，67（1）：16101.）

K F Yao，L X Shi，S Q Chen，Y Shao，N Chen，J L Jia. Research progress and application prospect of Fe-based soft magnetic amorphous/nanocrystalline alloys［J］. Acta Physica Sinica，2018，67（1）：16101.

［8］Liu T，Li F C，Wang A D，Xie L，He Q F，Luan J H，He A N，Wang X M，Liu C T，Yang Y. High performance Fe-based nanocrystalline alloys with excellent thermal stability［J］. Journal of Alloys and Compounds，2018，776：606.

［9］McHenry M E，Johnson F，Okumura H，Ohkubo T，Ramanan V R V，Laughlin D E. The kinetics of nanocrystallization and microstructural observations in FINEMET，NANOPERM and HITPERM nanocomposite magnetic materials［J］. Scripta Mater.，2003，48：881.

［10］Han M H，Sun C，Xu H J，Meng Y，Luo Q，Qiao B Y，Xu Y N，Zhang T. Revealing the effect of rapid annealing on nano-crystallization behavior and soft magnetic properties of Fe-Co-B amorphous alloy［J］. Journal of Materials Research and Technology，2023，26：5425.

［11］Yoshizawa Y，Oguma S，Yamauchi K. New Fe-based soft magnetic alloys composed of ultrafine grain structure［J］. J. Appl. Phys.，1988，64（10）：6044.

［12］Suzuki K，Makino A，Kataoka N，Inoue A，Masumoto T. High saturation magnetization and soft magnetic properties of bcc Fe-Zr-B and Fe-Zr-B-M （M=transition metal） alloys with nanoscale grain size［J］. Mater. Trans. JIM.，1991，32（1）：93.

［13］Willard M A，Laughlin D E，McHenry M E，Thoma D，Sickafus K，Cross J O，Harris V G. Structure and magnetic properties of （Fe0.5Co0.5）88Zr7B4Cu1 nanocrystalline alloys［J］. J. Appl. Phys.，1998，84（12）：6773.

［14］Makino A，Men H，Kubota T，Yubuta K，Inoue A. New excellent soft magnetic FeSiBPCu nanocrystallized alloys with high of 1.9 T from nanohetero-amorphous phase［J］. IEEE Transactions on Magnetics，2009，45（10）：4302.

［15］Liu T，Kong F，Xie L，Wang A，Chang C，Wang X，Liu C T. Fe（Co）SiBPCCu nanocrystalline alloys with high Bs above 1.83 T［J］. Journal of Magnetism and Magnetic Materials，2017，441：174.

［16］Herzer G. Modern soft magnets：amorphous and nanocrystalline materials［J］. Acta Materialia，2013，61（3）：718.

［17］Oshtrakh M I，Klencsár Z，Semionkin V A，Kuzmann E，Homonnay Z，Varga L K. Annealed FINEMET ribbons：structure and magnetic anisotropy as revealed by the high velocity resolution Mössbauer spectroscopy［J］. Materials Chemistry and Physics，2016，180：66.

［18］（唐鹏，于凤洋，刘倩男，谢粤凌，彭林欣，莫灼强. Sb含量及热处理对Al-11.5Si-9.5Mg合金组织与性能的影响［J］. 稀有金属，2022，46（4）：428.）

P Tang，F Y Yu，Q N Liu，Y L Xie，L X Peng，Z Q Mo. Microstructure and properties of Al-11.5Si-9.5Mg alloy with Sb addition and heat treatment［J］. Chinese Journal of Rare Metals，2022，46（4）：428.

［19］Hono K，Ping D H，Ohnuma M，Onodera H. Cu clustering and Si partitioning in the early crystallization stage of an Fe73.5Si13.5B9Nb3Cu1 amorphous alloy［J］. Acta Mater.，1999，47：997.

［20］Blázquez J S，Franco V，Conde A. The influence of Cu addition on the crystallization and magnetic properties of FeCoNbB alloys［J］. Journal of Physics：Condensed Matter，2002，14（45）：11717.

［21］Ohkubo T，Kai H，Ping D H，Hono K，Hirotsu Y. Mechanism of heterogeneous nucleation of α-Fe nanocrystals from Fe89Zr7B3Cu1 amorphous alloy［J］. Scripta Materialia，2001，44（6）：971.

［22］Li Y H，Jia X J，Zhang W，Zhang Y，Xie G Q，Qiu Z Y，Luan J H，Jiao Z B. Formation and crystallization behavior of Fe-based amorphous precursors with pre-existing α-Fe nanoparticles-structure and magnetic properties of high-Cu-content Fe-Si-B-Cu-Nb nanocrystalline alloys［J］. J. Mater. Sci. Technol.，2021，65：171.

［23］Wu L C，Li Y H，He A N，Zhu Z W，Zhang H F，Zhang W. Improvement of soft magnetic properties of a NANOPERM-type Fe-Hf-B nanocrystalline alloy upon surface crystallization inhibition by Cu addition［J］. Intermetallics，2023，163：108040.

［24］Li P，Zheng Z X，Su H L，Wu Y C. Effects of Cu content on magnetic properties of nanocrystalline Fe-Cu-Nb-Si-B alloy ribbons［J］. Materials Science & Technology，2013，29（11）：1324.

［25］Li Y L，Dou Z X，Chen X M，Lv K，Li F S，Hui X D. Optimization of crystallization behavior and soft magnetic properties of the Si-free Fe-B-P-C-Cu nanocrystalline alloys by Cu content tuning［J］. Materials Science and Engineering：B，2020，262：114740.

［26］Ayers J D，Harris V G，Sprague J A，Elam W T. On the role of Cu and Nb in the formation of nanocrystals in amorphous Fe73.5Nb3Cu1Si13.5B9［J］. Applied Physics Letters，1994，64（8）：974.

［27］Ayers J D，Harris V G，Sprague V G，Elam W T，Jones H N. On the formation of nanocrystals in the soft magnetic alloy Fe73.5Nb3Cu1Si13.5B9［J］. Acta Mater，1998，46（6）：1861.

［28］Xiong X Y，Muddle B C，Finlayson T R. The effect of Cu addition on the microstructure and low-temperature magnetization of nanocrystalline Fe87−xZr7B6Cux and Fe81−xZr7B12Cux alloys［J］. J. Phys. D：Appl. Phys.，2003，36：223.

［29］Sun Y M，Zuo B，Wang D，Meng X C，Liu J，Wang L L，Hua Z. Crystallization process of Fe75Co5Zr10B10 amorphous alloy［J］. Acta Physica Polonica A，2013，124（4）：685.

［30］（于万秋，周清雷，华中. 升温速率对Fe79Zr8Mo1B12非晶合金晶化过程及磁性能的影响［J］. 兵器材料科学与工程，2018，41（3）：20.）

W Q Yu，Q L Zhou，Z Hua. Effect of heating rates on crystallization process and magnetic property of Fe79Zr8Mo1B12 amorphous alloy［J］. Ordnance Material Science and Engineering，2018，41（3）：20.

Basic Information:

DOI：10.13373/j.cnki.cjrm.XY23100030

Chinese Library Classification Number:TG14

Citation Information:

The Fe-based amorphous nanocrystalline soft magnetic alloy materials had widespread applications in the electronic component industry and underwent extensive research. Achieving alloys with superior performance involved adjusting the elemental composition and heat treatment processes. Cu，a crucial nanocrystal-forming element，is commonly incorporated into various Fe-based amorphous nanocrystalline alloys. We prepared ingots with nominal compositions of Fe₈₁Zr₇Mo₂B₁₀ and Fe₈₁Zr₇Mo₂B₉Cu₁ through arc melting with high-purity elements，followed by four remelting cycles with magnetic stirring in a high-purity （99.99%） argon atmosphere. Subsequently，ribbons were produced through single-roller melt spinning and subjected to isothermal annealing in a vacuum for 1 h. Two distinct amorphous nanocrystalline alloys，Fe₈₁Zr₇Mo₂B₁₀ and Fe₈₁Zr₇Mo₂B₉Cu₁，were synthesized using the amorphous crystallization method. Differential scanning calorimetry （DSC） was employed to analyze the crystallization curves of both alloys，while X-ray diffraction （XRD） and transmission electron microscopy （TEM） were used to examine their structures. The concentration distribution of elements was investigated using scanning transmission electron microscopy/energy dispersive spectroscopy （STEM-EDS）. The hysteresis loops of the alloys were measured using the physical property measurement system （PPMS），and the coercivity （H_c） was subsequently determined. The XRD patterns of the as-quenched alloys revealed the distinctive broad diffuse peak characteristic of amorphous materials，confirming their amorphous state post-quenching. The addition of Cu resulted in a reduction in the initial （T_x） and end （T_p） crystallization temperatures of Fe₈₁Zr₇Mo₂B₁₀ alloy. The DSC curves showed the results of both alloys annealed at T_x and T_p，respectively. Specifically，the Fe₈₁Zr₇Mo₂B₁₀ alloy was annealed at 565 and 603 ℃，while the Fe₈₁Zr₇Mo₂B₉Cu₁ alloy was annealed at 540 and 585 ℃. The structures and magnetic properties of the two types of amorphous alloys annealed at T_x and T_p were systematically studied and compared. Upon annealing the Fe₈₁Zr₇Mo₂B₁₀ alloy at the initial crystallization temperature，the α-Fe phase precipitated from the amorphous matrix. After annealing at the end of crystallization temperature，the crystallization volume fraction and grain size of the Fe phase significantly increased，accompanied by the precipitation of an α-Mn type phase. In the case of the Fe₈₁Zr₇Mo₂B₉Cu₁ alloy，only the α-Fe crystallization phase precipitated from the amorphous matrix，both at the initial and end of the crystallization temperature. The primary crystallization phases of the Fe₈₁Zr₇Mo₂B₁₀ amorphous alloy were α-Fe and α-Mn type phases，with the α-Fe phase preceding the nucleation of the α-Mn type phase. Conversely，the primary crystallization phase of the Fe₈₁Zr₇Mo₂B₉Cu₁ alloy was a single α-Fe phase. TEM images revealed that smaller grains were uniformly distributed in the amorphous matrix for both alloys after annealing at the initial crystallization temperature. Following annealing at the end of crystallization temperature，a significant difference in the morphology of the two alloys emerged. Irregularly shaped grains of varying sizes were distributed in the remaining amorphous matrix for the Fe₈₁Zr₇Mo₂B₁₀ alloy. However，the grains of Fe₈₁Zr₇Mo₂B₉Cu₁ alloy remained small and evenly distributed in the remaining amorphous matrix. According to the line scan results of the Fe₈₁Zr₇Mo₂B₉Cu₁ alloy after annealing at 585 ℃，the Fe content in the amorphous matrix was smaller than that in the grains，while Zr and Mo were distributed in the remaining amorphous matrix. The line scan of Cu exhibited a significant change in content，areas with high Cu content corresponding to Cu clusters，confirming the existence of Cu clusters in the alloy. Furthermore，nano-measure software was used to perform statistical analysis on grains，and the grain-size distributions of the nanocrystals were obtained for the Fe₈₁Zr₇Mo₂B₉Cu₁ alloy after annealing at 585 ℃. The average grain size of the alloy was 10.1 nm. Furthermore，the H_c of the Fe₈₁Zr₇Mo₂B₉Cu₁ alloy was smaller than that of the Fe₈₁Zr₇Mo₂B₁₀ alloy during the primary crystallization process. After initial crystallization temperature heat treatment，the coercivity of the two alloys did not differ significantly. However，the H_c value of alloys without Cu was significantly higher than that of the alloy with Cu after heat treatment at the end of the crystallization temperature. Significant differences were observed in the structures and coercivity values when the Fe₈₁Zr₇Mo₂B₁₀ alloy without Cu was annealed at the initial and final crystallization temperatures. In contrast，the structures and coercivity values displayed little disparity when the Fe₈₁Zr₇Mo₂B₁₀ alloy containing Cu underwent annealing at the initial and final crystallization temperatures. The Fe₈₁Zr₇Mo₂B₉Cu₁ alloy consistently exhibited lower H_c values after annealing at the end of crystallization temperature. It was attributed to forming a dual-phase structure consisting of amorphous nanocrystals （amorphous+α-Fe） and the uniform distribution of small-sized α-Fe nanocrystals within the remaining amorphous matrix. Valuable insights were gained by systematically studying and comparing the changes in microstructure and coercivity of the two types of amorphous alloys annealed at the initial and the end of crystallization temperature. It contributed to a more comprehensive understanding of the impact of Cu addition on the microstructure and magnetic properties of Fe-based alloys during the primary crystallization process.