Comparison of the Crystallization Behavior of Fe-Si-B-Cu and Fe-Si-B-Cu-Nb-Based Amorphous Soft Magnetic Alloys

Smith, Casey; Katakam, Shravana; Nag, S.; Zhang, Y. R.; Law, Jia Yan; Ramanujan, R.V.; Dahotre, Narendra B.; Banerjee, Rajarshi

doi:10.1007/s11661-014-2239-8

Cited by 26 publications

(4 citation statements)

References 24 publications

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“…Functional magnetic materials (FMMs) have gained considerable interest for advanced engineering devices owing to their technical benefits for energy conversion, harvesting, transmission, sensing/actuation [1], and more recently for magnetic refrigeration applications, based on their magnetocaloric effects [2]. Fe-based soft magnetic materials are of great importance for sensors, transformers, and inductive devices because of their superior magnetic properties such as outstanding magnetic permeability, low coercivity, and good corrosion resistance [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Laser Additive Manufacturing of Fe-Based Magnetic Amorphous Alloys

Ozden

Morley

2021

Magnetochemistry

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Fe-based amorphous materials offer new opportunities for magnetic sensors, actuators, and magnetostrictive transducers due to their high saturation magnetostriction (λs = 20–40 ppm) and low coercive field compared with polycrystalline Fe-based alloys, which have high magnetostriction but large coercive fields and Co-based amorphous alloys with small magnetostriction (λs = −3 to −5 ppm). Additive layer manufacturing (ALM) offers a new fabrication technique for more complex net-shaping designs. This paper reviews the two different ALM techniques that have been used to fabricate Fe-based amorphous magnetic materials, including the structural and magnetic properties. Selective laser melting (SLM)—a powder-bed fusion technique—and laser-engineered net shaping (LENS)—a directed energy deposition method—have both been utilised to fabricate amorphous alloys, owing to their high availability and low cost within the literature. Two different scanning strategies have been introduced by using the SLM technique. The first strategy is a double-scanning strategy, which gives rise to maximum relative density of 96% and corresponding magnetic saturation of 1.22 T. It also improved the glassy phase content by an order of magnitude of 47%, as well as improving magnetic properties (decreasing coercivity to 1591.5 A/m and increasing magnetic permeability to around 100 at 100 Hz). The second is a novel scanning strategy, which involves two-step melting: preliminary laser melting and short pulse amorphisation. This increased the amorphous phase fraction to a value of up to 89.6%, and relative density up to 94.1%, and lowered coercivity to 238 A/m. On the other hand, the LENS technique has not been utilised as much as SLM in the production of amorphous alloys owing to its lower geometric accuracy (0.25 mm) and lower surface quality, despite its benefits such as providing superior mechanical properties, controlled composition and microstructure. As a result, it has been commonly used for large parts with low complexity and for repairing them, limiting the production of amorphous alloys because of the size limitation. This paper provides a comprehensive review of these techniques for Fe-based amorphous magnetic materials.

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Section: Introductionmentioning

confidence: 99%

Laser Additive Manufacturing of Fe-Based Magnetic Amorphous Alloys

Ozden

Morley

2021

Magnetochemistry

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“…Under laboratory conditions, annealing is most often performed in vacuum or in an inert environment (e.g., in He, Ar, N 2 , H 2 , and others), whereas this is carried out in air in industrial production. To improve the soft magnetic properties, it was attempted to vary the concentration of elements in the Finemet alloy [8][9][10][11][12][13][14][15][16], to substitute them with other elements [17][18][19][20][21][22][23][24], to perform annealing of the initial quasi-amorphous alloy for various times [25] and at various temperatures [8], in a magnetic field or without it [26][27][28][29][30][31], as well as under a pressure [32] or a tensile load [33][34][35][36][37][38].…”

Section: Introductionmentioning

confidence: 99%

Effect of Temperature of Long Annealing on the Structure and Magnetic Properties of Nanocrystalline FeSiNbCuB Alloy

et al. 2021

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The dependence of soft magnetic properties of the Fe 73.5 Si 13.5 Nb 3 Cu 1 B 9 alloy on the 2-hour air annealing temperature T an at temperatures from 520 to 620°C is studied. It is shown that the magnetic hysteresis loop is significantly broadens and becomes more inclined, and the Curie temperature of the amorphous matrix surrounding α-FeSi nanocrystals decreases with increasing T an . The atomic structure and phase composition of alloy samples are studied by transmission X-ray diffraction. After annealing at temperatures to 580°C, nanocrystals contain mostly D0 3 phase (Fe 3 Si stoichiometry) and are ~7 nm in average size. Their relative fraction in the alloy increases with temperature due to additional iron diffusion from the matrix to nanocrystals. After annealings at T an > 600°C, the average nanocrystal size increases, and iron boride crystal reflections appear in X-ray diffraction patterns. Degradation of soft magnetic properties of nanocrystalline Fe 73.5 Si 13.5 Nb 3 Cu 1 B 9 alloy with annealing temperature from 520 to 580°C is explained by a decrease in the silicon concentration in FeSi nanocrystals, which results in an increase in the magnetocrystalline anisotropy.

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“…), то при промышленном производстве -на воздухе. Для улучшения магнитомягких свойств делались попытки менять концентрацию элементов в сплаве Finemet [8][9][10][11][12][13][14][15][16], замещать их другими элементами [17][18][19][20][21][22][23][24], проводить отжиг исходного квазиаморфного сплава за разное время [25] и при различных температурах [8], в магнитном поле или без него [26][27][28][29][30][31], а также под давлением [32] или растягивающей нагрузкой [33][34][35][36][37][38].…”

Section: Introductionunclassified

Влияние температуры продолжительного отжига на структуру и магнитные свойства нанокристаллического сплава FeSiNbCuB

Ershov¹,

Черненков²,

Лукшина³

et al. 2021

Физика Твердого Тела

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A dependence of the soft magnetic properties of the Fe73.5Si13.5Nb3Cu1B9 alloy on the temperature of annealing (Tan) carried out in air for 2 hours at temperatures from 520 to 620°C was investigated. It was shown that with Tan increasing, the magnetic hysteresis loop broadens significantly and becomes more inclined, and the Curie temperature of the amorphous matrix surrounding the α-FeSi nanocrystals decreases. The atomic structure and phase composition of the alloy samples were investigated by X-ray diffraction in transmission geometry. After annealing at temperatures of up to 580°C, nanocrystals contain predominantly D03 phase (Fe3Si stoichiometry) and have average size of about 7 nm. Their relative fraction in the alloy increases as the temperature increases due to the additional diffusion of iron from the matrix into the nanocrystals. After annealing at Tan ≥ 600°C, the average size of the nanocrystals increases, and reflections of iron boride crystals appear in the diffractograms. The deterioration of the soft magnetic properties of the Fe73.5Si13.5Nb3Cu1B9 nanocrystalline alloy, when the annealing temperature rises from 520 to 580°C, is explained by a decrease in the silicon concentration in Fe-Si nanocrystals, which leads to a growth of the constant of the magnetocrystalline anisotropy.

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Comparison of the Crystallization Behavior of Fe-Si-B-Cu and Fe-Si-B-Cu-Nb-Based Amorphous Soft Magnetic Alloys

Cited by 26 publications

References 24 publications

Laser Additive Manufacturing of Fe-Based Magnetic Amorphous Alloys

Laser Additive Manufacturing of Fe-Based Magnetic Amorphous Alloys

Effect of Temperature of Long Annealing on the Structure and Magnetic Properties of Nanocrystalline FeSiNbCuB Alloy

Влияние температуры продолжительного отжига на структуру и магнитные свойства нанокристаллического сплава FeSiNbCuB

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