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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%.
Design and optimization of Fe-B-Si-Nb bulk amorphous alloy with “cluster plus connected atom” model based on the local structure of Fe_2B derived from Fe-B binary eutectic phase (B-B 2 Fe 8 Fe) was synthesized based on the electron concentration criterion. Considering the enthalpy of mixing between atoms, Si and Nb atoms were chosen to replace [B-B 2 Fe 8] clusters respectively (Si-B 2 Fe 8-x Nb 3 Nb 2 Fe 2 O 3) was obtained by using the Si-B 2 Fe_ (8-x) Nb_x] Bulk amorphous alloys can be formed at 0.2 ~ 1.2, of which bulk amorphous alloys with critical size of 2.5 mm can be formed in the compositional interval of x = 0.4 ~ 0.5. Considering the size of the atomic radius, in view of increasing Nb (Si1-yBy) -B_2Fe_ (8-x) Nb_x] can be obtained by decreasing the content of Si while maintaining the topological close-packed structure of [Si-B_2Fe7.6Nb0.4] Fe amorphous clusters. Fe cluster composition.The results show that the bulk amorphous glass with 2.5 mm in diameter can be obtained by Cu die casting in the range of (x = 0.5, y = 0.05) ~ (x = 0.9, y = 0.25) The newly designed Fe-B-Si-Nb bulk amorphous alloy has excellent soft magnetic properties at room temperature The saturation magnetization of [Si-B 2 Fe 8-x Nb 2 O x] Fe (x = 0.2-0.6) amorphous alloy is 1.14-1.46 T, and the coercive force is 1.6-6.7 A / m [ (Si 0.95 B 0.05 0.05) B 2 Fe 7.5 Nb 0.5 Fe bulk amorphous alloy has a compressive breaking strength at room temperature of 4220 MPa and a plastic deformation of about 0.5%.