Enhancement of glass-forming ability and thermal stability of a soft magnetic Co_(75)B_(25)metallic glass by micro-alloying Y and Nb  

作　　者：Feng Bao Yan-hui Li Zheng-wang Zhu Xin-yu Liang Yan Zhang 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,Liaoning,China [2]Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,Liaoning,China [3]Institute for Materials Research,Tohoku University,Sendai 980-8577,Miyagi,Japan

出　　处：《Journal of Iron and Steel Research International》2021年第5期597-603,共7页

基　　金：This research was supported by the National Natural Science Foundation of China(Grant Nos.51871039 and 51771039);the National Key Research and Development Program of China(Grant No.2017YFB0903903).

摘　　要：Soft magnetic Co-based Co-Y-Nb-B bulk metallic glasses(BMGs)without Fe have been developed by micro-alloying Y and Nb into a C075B25 alloy.First,addition of 3^at.%Y promotes the occurrence of glass transition and increases the supercooled liquid stability and magnetic softness.C0_(71.5)Y_(35)B_(25) metallic glass possesses a large supercooled liquid region(△T_(x))of 33 K and low coercivity(H_(c))of l.5 A/m.Subsequent alloying 2-4 at.% Nb into C0_(71.5)Y_(35)B_(25) alloy further enlarges △T_(x) to 50 K,lowers H_(c) to 0.9 A/m,and enables the formation of BMGs with a critical sample diameter up to 2.0 mm.The alloying Nb causes the formation of complex(Co,Nb,Y)_(23)B_(6) competing phase during crystallization and widens the melt undercooling during solidification,which improves the supercooled liquid stability and glass-forming ability,respectively.Co-Y-Nb-B BMGs also exhibit good soft magnetic and mechanical properties,i.e.,lowH_(c)of 0.9-1.2 A/m,relatively high saturation magnetic flux density of 0.36-0.57 T,high yielding strength of 3877-3930 MPa with plastic strain of 0.2%-0.3%,and high Vickers hardness of 1156-1201.The developed soft magnetic Co-based BMGs are promising for applications as structural and functional materials.

关 键 词：Co-based bulk metallic glass Glass-forming ability Thermal stability Soft magnetic property Micro-alloying 

分 类 号：TG13[一般工业技术—材料科学与工程]