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

作　　者：Benjun Wang Wenjun Liu Li Liu Yu Wang Yu Hang Xinyu Wang Mengen Shi Hanchen Feng Long Hou Chenchen Yuan Zhong Li Weihuo Li 汪本军;刘文君;刘莉;王玉;杭宇;王新宇;施蒙恩;冯汉臣;侯龙;袁晨晨;李忠;李维火(School of Materials Science and Engineering,School of Metallurgical Engineering,Anhui University of Technology,Ma'anshan 243002,China;Wuhu Technology and Innovation Research Institute,Wuhu 242000,China;School of Materials Science and Engineering,Instrumental Analysis Center,Southeast University,Nanjing 211189,China;Institute of Advanced Magnetic Materials,College of Materials and Environmental Engineering,Hangzhou Dianzi University,Hangzhou 310012,China)

机构地区：[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

出　　处：《Chinese Physics B》2024年第12期351-359,共9页中国物理B（英文版）

基　　金：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);the National Natural Science Foundation of China(Grant No.52071078)。

摘　　要：Compared to the commercial soft-magnetic alloys,the high saturation magnetic flux density(Bs)and low coercivity(Hc)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 ofα-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 theα-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_(s)of 1.79 T and very low H_(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.

关 键 词：nanocrystalline alloy magnetic softness MICROSTRUCTURES defects NANOINDENTATION 

分 类 号：O469[理学—凝聚态物理]