The effects of magnetic field annealing on the magnetic properties and microstructure of Fe80Si9B11 amorphous alloys

Wang, Chenxu; Wu, Zhaohui; Feng, Xiuli; Zhong, Li; Gu, Yuandong; Zhang, Yin; Tan, Xiaohua; Xu, Hui

doi:10.1016/j.intermet.2019.106689

Cited by 19 publications

(3 citation statements)

References 33 publications

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“…In this work, a distinct amorphous structure with a critical state was developed based on an order modulation strategy to fabricate ASMCs with prominent comprehensive soft magnetic properties. Annealing amorphous alloys under a transverse or longitudinal magnetic field is beneficial to the formation of medium-range order (MRO) [22,23]. Compared with the unidirectional magnetic field annealing, the rotating magnetic field annealing (RFA) not only promotes the formation of ordered structures, but also can reduce the unexpected field-induced magnetic anisotropy that has a detrimental effect on magnetic softness [24].…”

Section: Introductionmentioning

confidence: 99%

Critical state-induced emergence of superior magnetic performances in an iron-based amorphous soft magnetic composite

Shao,

Bai,

et al. 2024

Mater. Futures

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Soft magnetic composites (SMCs) play a pivotal role in the development of high-frequency, miniaturization and complex forming of modern electronics. However, they usually suffer from a trade-off between high magnetization and good magnetic softness (high permeability and low core loss). In this work, utilizing the order modulation strategy, a critical state in a FeSiBCCr amorphous soft magnetic composite (ASMC), consisting of massive crystal-like orders (CLOs, ~1 nm in size) with the feature of α-Fe, is designed. This critical-state structure endows the amorphous powder with the enhanced ferromagnetic exchange interactions and the optimized magnetic domains with uniform orientation and fewer micro-vortex dots. Superior comprehensive soft magnetic properties at high frequency emerge in the ASMC, such as a high saturation magnetization (Ms) of 170 emu/g and effective permeability (μe) of 65 combined with a core loss (Pcv) as low as 70 mW/cm3 (0.01 T, 1 MHz). This study provides a new strategy for the development of high-frequency ASMCs, possessing suitable comprehensive soft magnetic performance to match the requirements of the modern magnetic devices used in the third-generation semiconductors and new energy fields.

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Section: Introductionmentioning

confidence: 99%

Critical state-induced emergence of superior magnetic performances in an iron-based amorphous soft magnetic composite

Shao,

Bai,

et al. 2024

Mater. Futures

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“…[ 7–11 ] During this process, amorphous ribbons are spooled and then passed through a thermal heating zone while tension is applied along the ribbon axis. Prior studies have placed emphasis on development of a rigorous understanding of thermodynamic and kinetic factors, which dictate microstructure in nanocrystalline alloys and detailed correlations between nanometer‐scale microstructure and magnetic properties in a wide array of chemical compositions including Fe‐based, [ 12–14 ] Co‐based, [ 15–17 ] and FeNi‐based alloys. [ 18,19 ] Strain annealing may offer many future component and system‐level advantages through optimization of a core's permeability in power magnetic components.…”

Section: Introductionmentioning

confidence: 99%

Radio‐Frequency Rapid Thermal Processing Enabling Spatial Phase Transformation and Nanocrystallization of Soft Magnetic Amorphous Alloys

et al. 2022

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Thermal processing of soft magnetic amorphous and nanocrystalline alloys is explored under the influence of radio‐frequency induction‐heating techniques. Direct induction‐heating concepts based on longitudinal and transverse flux heating are examined and the details of electromagnetic fields interaction with metallic strips are discussed by analytical calculations as well as finite element analysis. Initial experimental results confirming spatial control of phase transformations and nanocrystallization within a single strip of Finemet Fe‐based amorphous ribbons are reported. The degree to which primary and secondary crystallization temperature are achieved depends on the spacing between the ribbon relative to the induction coil as well as the coil design and configuration. For transverse coil configurations, the local temperature and therefore microstructural evolution is different across the lateral dimension of processed ribbons, with reduced gap sizes producing enhanced peak temperatures and larger temperature distributions with greater spatial variation in microstructure. In addition, indirect susceptor‐based induction heating under tension is performed and the impact of microstructure is demonstrated. Herein, potential for exploiting spatially optimized phase transformations is illustrated through electromagnetic field–assisted processing in a scalable manufacturing process with amorphous and nanocrystalline soft magnetic alloys.

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“…In order to further explore the specific influence of the nanocrystalline phase on the MCE properties and critical behavior of HE-MGs, it is essential to increase the content of the nanocrystals. This can be effectively achieved in amorphous alloys through heat-treatment [36] in a protective atmosphere [34,35], magnetic field [37], stress condition [38], and by using current annealing [33,39]. Among these techniques, direct current (DC) Joule current annealing is more suitable for annealing metallic-glass microwires [33], as its characteristics, such as precisely tunable and controllable processing parameters, could prevent the microwires from becoming brittle.…”

Section: Introductionmentioning

confidence: 99%

Enhancing the magnetocaloric response of high-entropy metallic-glass by microstructural control

et al. 2021

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Non-equiatomic high-entropy alloys (HEAs), the second-generation multi-phase HEAs, have been recently reported with outstanding properties that surpass the typical limits of conventional alloys and/or the first-generation equiatomic single-phase HEAs. For magnetocaloric HEAs, non-equiatomic (Gd36Tb20Co20Al24)100−xFex microwires, with Curie temperatures up to 108 K, overcome the typical low temperature limit of rare-earth-containing HEAs (which typically concentrate lower than around 60 K). For alloys with x = 2 and 3, they possess some nanocrystals, though very minor, which offers a widening in the Curie temperature distribution. In this work, we further optimize the magnetocaloric responses of x = 3 microwires by microstructural control using the current annealing technique. With this processing method, the precipitation of nanocrystals within the amorphous matrix leads to a phase compositional difference in the microwires. The multi-phase character leads to challenges in rescaling the magnetocaloric curves, which is overcome by using two reference temperatures during the scaling procedure. The phase composition difference increases with increasing current density, whereby within a certain range, the working temperature span broadens and simultaneously offers relative cooling power values that are at least 2-fold larger than many reported conventional magnetocaloric alloys, both single amorphous phase or multi-phase character (amorphous and nanocrystalline). Among the amorphous rare-earth-containing HEAs, our work increases the working temperature beyond the typical <60 K limit while maintaining a comparable magnetocaloric effect. This demonstrates that microstructural control is a feasible way, in addition to appropriate compositional design selection, to optimize the magnetocaloric effect of HEAs.

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The effects of magnetic field annealing on the magnetic properties and microstructure of Fe80Si9B11 amorphous alloys

Cited by 19 publications

References 33 publications

Critical state-induced emergence of superior magnetic performances in an iron-based amorphous soft magnetic composite

Critical state-induced emergence of superior magnetic performances in an iron-based amorphous soft magnetic composite

Radio‐Frequency Rapid Thermal Processing Enabling Spatial Phase Transformation and Nanocrystallization of Soft Magnetic Amorphous Alloys

Enhancing the magnetocaloric response of high-entropy metallic-glass by microstructural control

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