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Chin. Phys. B, 2024, Vol. 33(12): 126101    DOI: 10.1088/1674-1056/ad84c8
CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES Prev   Next  

Correlation of microstructure and magnetic softness of Si-microalloying FeNiBCuSi nanocrystalline alloy revealed by nanoindentation

Benjun Wang(汪本军)1, Wenjun Liu(刘文君)1, Li Liu(刘莉)1, Yu Wang(王玉)1, Yu Hang(杭宇)1, Xinyu Wang(王新宇)1, Mengen Shi(施蒙恩)1, Hanchen Feng(冯汉臣)3, Long Hou(侯龙)1,2,†, Chenchen Yuan(袁晨晨)3, Zhong Li(李忠)4, and Weihuo Li(李维火)1,2
1 School of Materials Science and Engineering, School of Metallurgical Engineering, Anhui University of Technology, Ma'anshan 243002, China;
2 Wuhu Technology and Innovation Research Institute, Wuhu 242000, China;
3 School of Materials Science and Engineering, Instrumental Analysis Center, Southeast University, Nanjing 211189, China;
4 Institute of Advanced Magnetic Materials, College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310012, China
Abstract  Compared to the commercial soft-magnetic alloys, the high saturation magnetic flux density ($B_{\rm s}$) and low coercivity ($H_{\rm c}$) of post-developed novel nanocrystalline alloys tend to realize the miniaturization and lightweight of electronic products, thus attracting great attention. In this work, we designed a new FeNiBCuSi formulation with a novel atomic ratio, and the microstructure evolution and magnetic softness were investigated. Microstructure analysis revealed that the amount of Si prompted the differential chemical fluctuations of Cu element, favoring the different nucleation and growth processes of $\alpha $-Fe nanocrystals. Furthermore, microstructural defects associated with chemical heterogeneities were unveiled using the Maxwell-Voigt model with two Kelvin units and one Maxwell unit based on creeping analysis by nanoindentation. The defect, with a long relaxation time in relaxation spectra, was more likely to induce the formation of crystal nuclei that ultimately evolved into the $\alpha$-Fe nanocrystals. As a result, Fe$_{84}$Ni$_{2}$B$_{12.5}$Cu$_{1}$Si$_{0.5}$ alloy with refined uniform nanocrystalline microstructure exhibited excellent magnetic softness, including a high $B_{\rm s}$ of 1.79 T and very low $H_{\rm c}$ of 2.8 A/m. Our finding offers new insight into the influence of activated defects associated with chemical heterogeneities on the microstructures of nanocrystalline alloy with excellent magnetic softness.
Keywords:  nanocrystalline alloy      magnetic softness      microstructures      defects      nanoindentation  
Received:  03 July 2024      Revised:  27 September 2024      Accepted manuscript online:  09 October 2024
PACS:  61.43.Dq (Amorphous semiconductors, metals, and alloys)  
  65.60.+a (Thermal properties of amorphous solids and glasses: heat capacity, thermal expansion, etc.)  
  75.60.Ej (Magnetization curves, hysteresis, Barkhausen and related effects)  
Fund: Project supported by the Anhui Provincial Natural Science Foundation (Grant No. 2208085QE121), the Key Research & Development Plan of Anhui Province (Grant No. 2022a05020016), the University Natural Science Research Project of Anhui Province (Grant No. 2023AH051084), and the National Natural Science Foundation of China (Grant No. 52071078).
Corresponding Authors:  Long Hou     E-mail:  longhou@ahut.edu.cn

Cite this article: 

Benjun Wang(汪本军), Wenjun Liu(刘文君), Li Liu(刘莉), Yu Wang(王玉), Yu Hang(杭宇), Xinyu Wang(王新宇), Mengen Shi(施蒙恩), Hanchen Feng(冯汉臣), Long Hou(侯龙), Chenchen Yuan(袁晨晨), Zhong Li(李忠), and Weihuo Li(李维火) Correlation of microstructure and magnetic softness of Si-microalloying FeNiBCuSi nanocrystalline alloy revealed by nanoindentation 2024 Chin. Phys. B 33 126101

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