Enhanced magnetic performance of Fe-rich Sm2Co17-type magnets by optimizing Zr content  

作　　者：Jian Li Minxia Fang Yao Liu Xin Song Wentao Jia Junming Gou Tao Yuan Yuanchao Ji Lizhong Zhao Chen Wang Tianyu Ma 

机构地区：[1]Frontier Institute of Science and Technology,MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter,and State Key Laboratory for Mechanical Behavior of Materials,Xi’an Jiaotong University,Xi’an 710049,China [2]The Southwest Applied Magnetism Research Institute,Mianyang 621000,China [3]Institute of Advanced Magnetic Materials,College of Materials&Environmental Engineering,Hangzhou Dianzi University,Hangzhou 310018,China [4]College of Materials Science and Engineering,Fuzhou University,Fuzhou 350002,China

出　　处：《Journal of Materials Science & Technology》2024年第26期178-186,共9页材料科学技术(英文版)

基　　金：supported by the National Key R&D Program of China(Grant No.2022YFB3505301);the National Natural Sci-ence Foundation of China(Grant No.52071256);the China Post-doctoral Science Foundation(Grant No.2022T150510);the Key R&D project of Zhejiang Province(Grant No.2023C01077).

摘　　要：Despite the high theoretical energy product and low material cost of Fe-rich 2:17-type Sm-Co-Fe-Cu-Zr magnets,it is still a big challenge to simultaneously achieve high energy product and high coercivity due to damaged cellular nanostructure,i.e.insufficient cell boundary precipitates.In this work,both high energy product(∼30.29 MGOe)and high coercivity(∼26.24 kOe)have been achieved in Fe-rich Sm_(24.8)Co_(bal)Fe_(20.5)Cu_(5.2)Zr_(x)(x wt%)magnets through optimizing Zr content.It reveals that raising Zr content from 1.5 wt%to 2.5 wt%can effectively refine the cellular nanostructure,which corresponds to an increased volume fraction of cell boundary precipitates.However,excess Zr content(e.g.above 2.5 wt%)leads to the formation of micron-sized Zr-rich Zr6Co23 soft magnetic particles,weakening the hard magnetic performance.In particular,the high Zr-content(3.5 wt%)magnet exhibits strongly inhomogeneous chemistry as well as cellular nanostructure in the vicinity of micron-sized Zr_(6)Co_(23)particles(i.e.heterogeneous distribution of cell boundary precipitates),deteriorating both squareness factor and coercivity.As a result,the optimum magnetic property combination is achieved at an intermediate Zr concentration by balancing the contradictive effects between cell refinement and soft magnetic impurities.

关 键 词：Permanent magnets Magnetic properties MICROSTRUCTURE 

分 类 号：TM2[一般工业技术—材料科学与工程]