Fe-B-Si-Nb块体非晶合金的成分设计与优化  

COMPOSITION DESIGN AND OPTIMIZATION OF Fe-B-Si-Nb BULK AMORPHOUS ALLOYS

作　　者：耿遥祥[1] 王英敏[2] 羌建兵[2] 董闯[2] 汪海斌[1] 特古斯[3] GENG Yaoxiang WANG Yingmin QIANG Jianbing DONG Chuang WANG Haibin TEGUS Ojied(School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China Key Lab of Materials Modification by Laser, Ion and Electron Beams, Ministry of Education, Dalian University of Technology, Dalian 116024, China Inner Mongolia Key Laboratory for Physics and Chemistry of Functional Materials, Inner Mongolia Normal University, Hohhot 010022, China)

机构地区：[1]江苏科技大学材料科学与工程学院,镇江212003 [2]大连理工大学三束材料改性教育部重点实验室,大连116024 [3]内蒙古师范大学内蒙古自治区功能材料物理与化学重点实验室,呼和浩特010022

出　　处：《金属学报》2016年第11期1459-1466,共8页Acta Metallurgica Sinica

基　　金：国家自然科学基金项目51131002;中央高校基础研究基金项目DUT16ZD209和DUT13ZD102;中国工程物理研究院重点发展基金项目2013A03010115;国际热核聚变实验堆计划项目2013GB107003;西北工业大学凝固技术国家重点实验室开放课题项目SKLSP201607资助~~

摘　　要：利用"团簇加连接原子"模型设计和优化具有高形成能力的Fe-B-Si-Nb块体非晶合金.以源于Fe-B二元共晶相的Fe_2B局域结构为基础,结合电子浓度判据,构建Fe-B二元理想非晶团簇式[B-B_2Fe_8]Fe;考虑到原子间混合焓的大小,选择Si和Nb原子分别替代[B-B_2Fe_8]团簇的中心原子B和壳层原子Fe,得到[Si-B_2Fe_(8-x)Nb_x]Fe系列四元非晶成分.结果表明,[Si-B_2Fe_(8-x)Nb_x]Fe团簇式在x=0.2~1.2成分处均可形成块体非晶合金,其中在x=0.4~0.5的成分区间内均可形成临界尺寸为2.5 mm的块体非晶合金.考虑到原子半径的大小,鉴于增加Nb的同时降低Si的含量可维持[Si-B_2Fe7.6Nb0.4]Fe非晶团簇结构的拓扑密堆性,由此得到另一系列[(Si1-yBy)-B_2Fe_(8-x)Nb_x]Fe团簇式成分.结果表明,在(x=0.5,y=0.05)^(x=0.9,y=0.25)成分区间内均可通过Cu模铸造法获得直径为2.5 mm的块体非晶.新设计获得的Fe-B-Si-Nb块体非晶合金具有优良的室温软磁性能和力学性能,其中[Si-B_2Fe_(8-x)Nb_x]Fe(x=0.2~0.6)非晶合金的饱和磁化强度为1.14~1.46 T,矫顽力为1.6~6.7 A/m;[(Si_(0.95)B_(0.05))-B_2Fe_(7.5)Nb_(0.5)]Fe块体非晶合金的室温压缩断裂强度达4220 MPa,塑性形变约为0.5%.Fe-based amorphous alloys are well known for their good magnetic properties including ultrahigh saturation magnetization, low coercive force, high magnetic permeability and low core loss. But these alloys were only prepared into ribbon form in early times due to their insufficient glass-forming abilities （GFAs）. The present work focuses on the design of Fe-B-Si-Nb bulk metallic glasses with good soft magnetic properties and high glassforming ability. Glass formation in Fe-B system is first considered with cluster-plus-glue-atom model. A basic composition formula [B-B2Fe8]Fe is proposed as the framework for multi-component alloy design. Considering the structural stability of the model glass, Si and Nb are introduced to the [B-B2Fe8] cluster to replace the center B and shell Fe atoms, from which a series of Fe-B-Si-Nb alloys with composition formulas [Si-B2Fe8-xNbx]Fe （x=0.1-1.2） are derived. Copper mold casting experiments revealed that bulk glass alloys with a critical diameter （dc） exceeding 1.0 mm are readily obtained with the Nb content range of x=0.2-1.2, the largest do （about 2.5 mm） appears in the vicinity of x=0.4-0.5. Considering the local packing efficiency of Fe-B-Si-Nb glass model structure, another series alloy compositions, namely, [（Si1-yBy）-B2Fe8-xNbx]Fe is reached by increasing Nb and decreasing Si simultaneously in [Si-B2Fe7.6Nb0.4]Fe basal glass alloys. The experimental results show that bulk glass alloys with d0=2.5 mm are available over a wide range of compositions from （x=0.5, y=0.05） to （x=0.9, y=0.25）. Excellent magnetic softness with high saturation magnetizations （Bs=1.14-1.46 T） and low coercive forces （Hc=1.6-6.7 A/m） is found in the [SiB：Fe8-xNbx]Fe （x=0.2-0.6） series glass alloys. A high fracture strength of 4220 MPa with a plasticity of 0.5% is observed in the [（Si0.95B0.05）-B2Fe7.5Nb0.5]Fe bulk glass alloy.

关 键 词：“团簇加连接原子”模型 Fe-B-Si-Nb块体非晶合金 力学性能 软磁性能 

分 类 号：TG139.8[一般工业技术—材料科学与工程]