Fe-Si-B amorphous alloys with high silicon concentration

Inoue, Akihisa; Komuro, Marina; Masumoto, T.

doi:10.1007/bf00980780

Cited by 29 publications

(4 citation statements)

References 6 publications

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“…Mostly, the high APFA of Fe-B alloys enables the formation of the amorphous phase and Si makes additional contribution to it. A fully amorphous phase is achieved within the range of 5-26 at.% B and 0-29 at.% Si [67]. Accordingly, Fe92.4Si3.1B4.5 alloy was produced with SLM with a laser scan speed of 100-150 mm/s and laser power of 90 W by using gas-atomised powder having particle sizes less than 30 µm, purchased from NANOVAL company as Fe92.4Si3.1B4.5 amorphous powder [68].…”

Section: Powder-bed Fusionmentioning

confidence: 99%

“…The immoderate number of impurity atoms in the interstitial sites is linked to the formation of the amorphous ε-FeSi type structure by distorting the crystal lattice locally. The strong attraction between Fe and Si atoms indicates that APFA may be comparatively high in the Si composition above 20 at.% Si [67]. Furthermore, the large negative heat of mixing between constituents (−26 kJ/mol for Fe-Si and -38 kJ/mol for Fe-B alloys [69]) allows short-range order in the liquid upon laser melting.…”

Section: Powder-bed Fusionmentioning

confidence: 99%

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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: Powder-bed Fusionmentioning

confidence: 99%

Section: Powder-bed Fusionmentioning

confidence: 99%

Laser Additive Manufacturing of Fe-Based Magnetic Amorphous Alloys

Ozden

Morley

2021

Magnetochemistry

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“…Nanocrystalline (NC) and/or amorphous FeSiB alloys have been extensively studied due to their microstructures, which consist of crystalline nanograins embedded in a residual amorphous matrix [1][2][3][4][5]. Consequently, they are very interesting from an economical point of view because they are relatively cheap due to the natural abundance of their elements in the earth.…”

Section: Introductionmentioning

confidence: 99%

Structure, Microstructure, Hyperfine, Mechanical and Magnetic Behavior of Selective Laser Melted Fe92.4Si3.1B4.5 Alloy

Drablia

Alleg

Fenineche

et al. 2022

Metals

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A disordered ε-FeSi crystalline structure was produced by selective laser melting in Fe92.4Si3.1B4.5 powder alloys fabricated with different laser powers at a laser scanning speed of 0.4 m/s. The phase formation, microstructure, roughness, microhardness, and hyperfine and magnetic properties were studied using X-ray diffraction, scanning electron microscopy, atomic force microscopy, a profilometer, a microdurometer, transmission 57Fe Mössbauer spectrometry and vibrating sample magnetometry. The aim of this work was therefore to study the effect of laser power on the phase formation, microstructure, morphology, and mechanical, hyperfine and magnetic properties. The XRD patterns revealed the coexistence of a bcc α-Fe0.95Si0.05, a tetragonal Fe2B boride phase and a disordered ε-FeSi type structure. The existence of the disorder was confirmed by the presence of different FeSi environments observed in the Mössbauer spectra. The Fe2B boride contained about 51–54% of Fe atoms. The porosity and roughness decreased whereas laser power increased. The sample produced with a laser power of 90 W had a smooth and dense surface, high microhardness (~1843 Hv) and soft magnetic properties (saturation magnetization Ms = 200 emu/g and coercivity Hc = 79 Oe).

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“…However, inadequate room temperature ductility and poor high temperature strength have hindered commercial application of this alloy. Recently, many studies have found that microstructural modifications of β-NiAl that included the ductile γ' phase resulted in remarkable enhancement of high temperature strength and room temperature ductility [2][3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Phase transformation and microstructural features of NiAl/Ni3Al two-phase alloys containing ternary elements

et al. 2004

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Various ternary elements were added to observe the effects on the microstructural features of β+γ' two-phase alloys. The microstructural features of β+γ' two-phase (Ni66Al34)100-χXχ(X=Ti, Si, Nb) depended on the As (austenite start) temperature of β'-martensite with alloying elements. For As>250 o C, a lamellar microstructure was found to form by the following phase transformation: Martensite→Ni5Al3→β+γ'. For As<250 o C, twotype microstructures, mesh and Widmanstätten, were formed depending on the ternary element. When Ti or Nb was added as a ternary element, the β→Ni5Al3 transformation occurred very quickly. Conversely, this transformation proceeded very slowly in the case of Si addition, and the resultant microstructure assumed somewhat different features. Consequently, it could be suggested that the microstructures of NiAl/Ni3Al twophase alloys are determined by not only the As temperature but also by the β→Ni5Al3 transformation.

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Fe-Si-B amorphous alloys with high silicon concentration

Cited by 29 publications

References 6 publications

Laser Additive Manufacturing of Fe-Based Magnetic Amorphous Alloys

Laser Additive Manufacturing of Fe-Based Magnetic Amorphous Alloys

Structure, Microstructure, Hyperfine, Mechanical and Magnetic Behavior of Selective Laser Melted Fe92.4Si3.1B4.5 Alloy

Phase transformation and microstructural features of NiAl/Ni3Al two-phase alloys containing ternary elements

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