TY - JOUR
T1 - Dual-Cluster Characteristic and Composition Optimization of Finemet Soft Magnetic Nanocrystalline Alloys
AU - Geng, Yaoxiang
AU - Lin, Xin
AU - Qiang, Jianbing
AU - Wang, Yingmin
AU - Dong, Chuang
N1 - Publisher Copyright:
© All right reserved.
PY - 2017/7/11
Y1 - 2017/7/11
N2 - The development of nanocrystalline Fe-Si-B-Nb-Cu alloys, commercially known as Finemet, has established a new approach to obtain soft-magnetic materials with high magnetic flux density. The material consists of α-Fe(Si) nanocrystals embedded in an amorphous matrix, which is made by means of partial crystallization. The composition and local structure of the precursor amorphous alloys are crucial for the formation of the unique nanocrystalline structure. The present study is devoted to understanding the composition characteristics and developing new compositions of Finemet alloys. Using the"cluster-plus-glue-atom"model and noticing the crystallization characteristic of Finemet alloy, a"dualcluster"amorphous structure model is proposed. In this model, the precursor amorphous structure of Finemet alloy is considered to contain a mixture of the [(Si, B)-B2(Fe, Nb)8]Fe cluster derived from the FeB-Si-Nb bulk glassy alloys, and the [Si-Fe14] (Cu1/13Si12/13)3 cluster from Fe3Si phase. A series of new Finemet nanocrystalline alloy compositions are designed by mixing [(Si, B)-B2(Fe, Nb)8]Fe and [Si-Fe14] (Cu1/13Si12/13)3 cluster formulas with a ratio of 1: 1. Thermal analysis results show that [(Si0.8B0.2)-B2Fe7.2Nb0.8] Fe+[Si-Fe14](Cu1/13Si12/13)3 (alloy composition: Fe74B7.33Si15.23Nb2.67Cu0.77) amorphous alloy exhibits a maximal temperature interval of about 192 K between the first and second crystallization peaks. Magnetic measurement results show that the Fe74B7.33Si15.23Nb2.67Cu0.77 nanocrystalline alloy exhibits optimal soft magnetic properties with a saturation magnetization Bs about 1.26 T, a coercive force Hc about 0.5 A/m and an effective permeability me about 8.5×105 at 1 kHz after isothermal annealing at 813 K for 60 min. The soft magnetic properties of the new composition nanocrystalline alloys are better than that of the typical Finemet nanocrystalline alloy (Fe73.5Si13.5B9Cu1Nb3).
AB - The development of nanocrystalline Fe-Si-B-Nb-Cu alloys, commercially known as Finemet, has established a new approach to obtain soft-magnetic materials with high magnetic flux density. The material consists of α-Fe(Si) nanocrystals embedded in an amorphous matrix, which is made by means of partial crystallization. The composition and local structure of the precursor amorphous alloys are crucial for the formation of the unique nanocrystalline structure. The present study is devoted to understanding the composition characteristics and developing new compositions of Finemet alloys. Using the"cluster-plus-glue-atom"model and noticing the crystallization characteristic of Finemet alloy, a"dualcluster"amorphous structure model is proposed. In this model, the precursor amorphous structure of Finemet alloy is considered to contain a mixture of the [(Si, B)-B2(Fe, Nb)8]Fe cluster derived from the FeB-Si-Nb bulk glassy alloys, and the [Si-Fe14] (Cu1/13Si12/13)3 cluster from Fe3Si phase. A series of new Finemet nanocrystalline alloy compositions are designed by mixing [(Si, B)-B2(Fe, Nb)8]Fe and [Si-Fe14] (Cu1/13Si12/13)3 cluster formulas with a ratio of 1: 1. Thermal analysis results show that [(Si0.8B0.2)-B2Fe7.2Nb0.8] Fe+[Si-Fe14](Cu1/13Si12/13)3 (alloy composition: Fe74B7.33Si15.23Nb2.67Cu0.77) amorphous alloy exhibits a maximal temperature interval of about 192 K between the first and second crystallization peaks. Magnetic measurement results show that the Fe74B7.33Si15.23Nb2.67Cu0.77 nanocrystalline alloy exhibits optimal soft magnetic properties with a saturation magnetization Bs about 1.26 T, a coercive force Hc about 0.5 A/m and an effective permeability me about 8.5×105 at 1 kHz after isothermal annealing at 813 K for 60 min. The soft magnetic properties of the new composition nanocrystalline alloys are better than that of the typical Finemet nanocrystalline alloy (Fe73.5Si13.5B9Cu1Nb3).
KW - "dual-cluster"model
KW - Composition design
KW - Finemet nanocrystalline alloy
KW - Soft magnetic property
UR - http://www.scopus.com/inward/record.url?scp=85032864249&partnerID=8YFLogxK
U2 - 10.11900/0412.1961.2016.00546
DO - 10.11900/0412.1961.2016.00546
M3 - 文章
AN - SCOPUS:85032864249
SN - 0412-1961
VL - 53
SP - 833
EP - 841
JO - Jinshu Xuebao/Acta Metallurgica Sinica
JF - Jinshu Xuebao/Acta Metallurgica Sinica
IS - 7
ER -