Novel Soft Magnetic Co-Based Ternary Co-Er-B Bulk Metallic Glasses  

作　　者：Jie Lu Yanhui Li Shuang Ma Wanping Li Feng Bao Zhengwang Zhu Qiaoshi Zeng Haifeng Zhang Man Yao Wei Zhang 

机构地区：[1]Key Laboratory of Materials Modification By Laser,Ion,and Electron Beams(Ministry of Education),School of Materials Science and Engineering,Dalian University of Technology,Dalian,116024,China [2]School of Metallurgy,Northeastern University,Shenyang,110819,China [3]Center for High Pressure Science and Technology Advanced Research(HPSTAR),Pudong,Shanghai,201203,China

出　　处：《Acta Metallurgica Sinica(English Letters)》2024年第9期1633-1642,共10页金属学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.52171153 and 51871039);supported by the Department of Energy(DOE)Office of Science(DE-AC02-06CH11357);financial support from the Shanghai Science and Technology Committee,China(Grant No.22JC1410300);the Shanghai Key Laboratory of Material Frontiers Research in Extreme Environments(MFree),China(Grant No.22dz2260800).

摘　　要：In this work,a series of Co-based ternary Co-Er-B bulk metallic glasses(BMGs)with excellent soft magnetic properties and high strength were developed,and the local atomic structure of a typical Co_(71.5)Er_(3.5)B_(25) metallic glass was studied through in situ high-energy synchrotron X-ray diffraction and ab initio molecular dynamics simulations.The results reveal that the BMG samples can be obtained in a composition region of Co_(68.5-71.5)Er_(3.5-4)B_(25-27.5) by a conventional copper-mold casting method.The Co-Er-B metallic glasses possess stronger atomic bond strengths and denser local atomic packing structure composed of a higher fraction of icosahedral-like clusters but fewer deformed body-centered cubic and crystal-like polyhedrons,and they exhibit slower atomic diffusion behaviors during solidification,as compared to Co-Y-B counterparts.The enhancement in structural stability and the retardation of atomic-ordered diffusion lead to the better glass-forming ability of the Co-Er-B alloys.The smaller magnetic anisotropy energy in the Co-Er-B metallic glasses results in a lower coercivity of less than 1.3 A/m.The Co-Er-B BMGs exhibit high-yield strength of 3560-3969 MPa along with distinct plasticity of around 0.50%.

关 键 词：Co-based bulk metallic glass Glass-forming ability Soft magnetic property Ab initio molecular dynamics simulation Local atomic structure 

分 类 号：TG14[一般工业技术—材料科学与工程]