Effect of Si/B ratio on glass-forming ability, phase transitions and magnetic properties in (Fe 40 Ni 40 Si x B y Cu 1 )
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Effect of Si/B ratio on glass-forming ability, phase transitions and magnetic properties in (Fe40Ni40SixByCu1)0.97Nb0.03 alloys Zhe Chen1,2, Qianke Zhu1,2, Kewei Zhang1,2,*
, Qi Guo1,2, and Yong Jiang1,2,3
1
School of Materials Science and Engineering, Taiyuan University of Science and Technology, 030024 Taiyuan, China Laboratory of Magnetic and Electric Functional Materials and the Applications, The Key Laboratory of Shanxi Province, Taiyuan, China 3 Beijing Advanced Innovation Center for Materials Genome Engineering, School of Materials Science and Engineering, University of Science and Technology, 100083 Beijing, China 2
Received: 4 July 2020
ABSTRACT
Accepted: 9 November 2020
The (Fe40Ni40SixByCu1)0.97Nb0.03 (Si/B = 3:1, 2:1, 1:1, 1:2 and 1:3) alloys were fabricated through the melt-spun technique. The effects of Si/B ratio on the glass-forming ability (GFA), phase transitions and soft magnetic properties were investigated. Results showed that when Si/B = 1:1, 1:2 and 1:3, the GFA of the FeNiSiBCuNb alloy is good, and the amorphous structure is homogeneous. We found a phase transition from the amorphous phase to a-Fe (Si) phase and then to c-(Fe,Ni)Si phase in Si/B = 1:1 alloy by employing a simple heat treatment process. The alloys with Si/B = 1:1 and 1:2 containing a low coercivity of 0.30 A/m and 0.25 A/m domain structures were characterized with magnetooptical Kerr microscope (MOKE) to unveil that the internal stress relief is beneficial to the magnetization process. The three alloys exhibit different crystallization behaviors, and moderate Si can effectively inhibit c-(FeNi) grains overgrowth.
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Introduction FeNi-based amorphous alloys with relatively good mechanical properties [1, 2], low coercivity (Hc) and high permeability (l) have been used in power transformers [3], sensors [4], reactors [5] and others Handling Editor: P. Nash.
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https://doi.org/10.1007/s10853-020-05555-w
[6–10]. However, the glass-forming ability (GFA) and soft magnetic properties still need to be improved to broaden their application fields. A lot of efforts have been devoted to the improvement in the glass-forming ability (GFA) by adjusting the alloy composition with stronger negative values (DHmix) and large atomic size difference (d) and enhancement of soft
J Mater Sci
magnetic properties by thermal annealing an amorphous alloy with optimized conditions (time [11], temperature [12] and heating rate [13, 14]). The structural evolution of the trademark of Metglas2826MB (Fe40Ni38Mo4B18) has been studied [15]. The results showed that the fcc-FeNi grains embedded in the residual amorphous phase tend to grow rapidly with rising temperature, which directly attributes to the deterioration of soft magnetic properties [16]. A.M. Glezer proposed that B was barely soluble in Fe and Ni, so that they concentrated around the fcc-FeNi crystallites and formed a barrier layer which inhibited the excessive grain growth.
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