Cu clustering and Si partitioning in the early crystallization stage of an Fe73.5Si13.5B9Nb3Cu1 amorphous alloy

Hara, Kazuhiro; Ping, D. H.; Ohnuma, Masato; Onodera, Hidetoshi

doi:10.1016/s1359-6454(98)00392-9

Cited by 374 publications

(167 citation statements)

References 14 publications

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“…the change in the activation energy of the viscous flow in the melt produced from the amorphous ribbon takes place at a lower temperature. Note that the numerical values of the viscosity of the melt produced from the melt in the regime with overheating are close to the values for the melt prepared from the ingot immediately after casting and cooling the 9 . The results obtained show that the viscosity of the melt essentially depends on the initial structural state.…”

Section: Resultssupporting

confidence: 61%

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Melt Viscosity of the Soft Magnetic Nanocrystalline Fe_72.5Cu₁Nb₂Mo_1.5Si₁₄B₉Alloy

2017

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Abstract. Temperature dependences of the kinematic viscosity of a multicomponent Fe 72.5 Cu 1 Nb 2 Mo 1.5 Si 14 B 9 melt have been studied. A critical temperature is detected above which the activation energy of the melt' viscous flow changes. Comparison of the temperature dependences of the kinematic viscosity of the melts prepared from the initial ingot and an amorphous ribbon shows that the melt viscosity essentially depends on the initial structural state of the alloy. In amorphous ribbon produced in the mode with overheating, and the melt is above the critical temperature, the enthalpy of crystallization grows; the following heat treatment results in an increase in magnetic permeability.

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Section: Resultssupporting

confidence: 61%

“…Į-FeSi-based nanocrystals have a lower content of silicon at the initial state of the crystallization process. This silicon FRQWHQW LV JUDGXDOO\ LQFUHDVLQJ XS WR Į-Fe 80 Si 20 [9]. Nanocrystals can also contain Mo, the solubility of which is 2.5 % in Į-Fe at 700 °ɋ [10,11].…”

Section: Lam-16mentioning

confidence: 99%

Melt Viscosity of the Soft Magnetic Nanocrystalline Fe_72.5Cu₁Nb₂Mo_1.5Si₁₄B₉Alloy

2017

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“…2 A microstructure consisting of very fine α-Fe phase embedded in amorphous matrix can be obtained by a suppression of long distance diffusion by Nb atom during a heat treatment. 3 However, the saturation magnetic flux density was still very low because of the Nb addition.…”

Section: Introductionmentioning

confidence: 99%

Fe-Si-B-P-C-Cu nanocrystalline soft magnetic powders with high B s and low core loss

et al. 2017

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The magnetic properties of Fe-Si-B-P-C-Cu nanocrystalline powders were investigated. Fe-Si-B-P-C-Cu powders with a mostly amorphous structure were prepared by an atomization method. The atomized powders were annealed in inert gas atmosphere for nanocrystallization. The Fe84.8Si0.5B9.4P3.5C1Cu0.8 nanocrystalline powder exhibits high Bs of 1.76T, which is appreciably higher than that of conventional Fe-based amorphous powders (1.3 - 1.5 T) and close to that of Fe3.5Si4.5Cr (1.86T) crystalline one. The magnetic loss of toroidal core made of the Fe84.8Si0.5B9.4P3.5C1Cu0.8 nanocrystalline powder is also the lowest compared to that of amorphous and crystalline counterparts. This result indicates that Fe-Si-B-P-C-Cu nanocrystalline powders could contribute in efficiency-improvement as well as miniaturization of soft-magnetic cores.

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“…1,2) However, detailed studies on the atomic arrangements of specific amorphous alloys reveal nano-scale segregation zones of specific elements significantly affecting macroscopic properties of amorphous alloys. [3][4][5][6] Therefore, information on the spatial distribution of supersaturated alloying elements is important to understand macroscopic properties of the amorphous alloy. The chemical heterogeneity of amorphous alloys can be effectively studied in an atomic scale using an atom probe facility.…”

Section: Introductionmentioning

confidence: 99%

Spatial Distributions of Alloying Elements Obtained from Atom Probe Tomography of the Amorphous Ribbon Fe75C11Si2B8Cr4

Shin¹,

Sangbong²,

Pradeep³

et al. 2013

Korean. J. Mater. Res.

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Spatial distributions of alloying elements of an Fe-based amorphous ribbon with a nominal composition of Fe 75 C 11 Si 2 B 8 Cr 4 were analyzed through the atom probe tomography method. The amorphous ribbon was prepared through the melt spinning method. The macroscopic amorphous natures were confirmed using an X-ray diffractometer (XRD) and a differential scanning calorimeter (DSC). Atom Probe (Cameca LEAP 3000X HR) analyses were carried out in pulsed voltage mode at a specimen base temperature of about 60 K, a pulse to base voltage ratio of 15 %, and a pulse frequency of 200 kHz. The target detection rate was set to 5 ions per 1000 pulses. Based on a statistical analyses of the data obtained from the volume of 59 × 59 × 33 nm 3 , homogeneous distributions of alloying elements in nano-scales were concluded. Even with high carbon and strong carbide forming element contents, nano-scale segregation zones of alloying elements were not detected within the Fe-based amorphous ribbon. However, the existence of small sub-nanometer scale clusters due to short range ordering cannot be completely excluded.

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Cu clustering and Si partitioning in the early crystallization stage of an Fe73.5Si13.5B9Nb3Cu1 amorphous alloy

Cited by 374 publications

References 14 publications

Melt Viscosity of the Soft Magnetic Nanocrystalline Fe_72.5Cu₁Nb₂Mo_1.5Si₁₄B₉Alloy

Melt Viscosity of the Soft Magnetic Nanocrystalline Fe_72.5Cu₁Nb₂Mo_1.5Si₁₄B₉Alloy

Fe-Si-B-P-C-Cu nanocrystalline soft magnetic powders with high B s and low core loss

Spatial Distributions of Alloying Elements Obtained from Atom Probe Tomography of the Amorphous Ribbon Fe75C11Si2B8Cr4

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Cu clustering and Si partitioning in the early crystallization stage of an Fe73.5Si13.5B9Nb3Cu1 amorphous alloy

Cited by 374 publications

References 14 publications

Melt Viscosity of the Soft Magnetic Nanocrystalline Fe72.5Cu1Nb2Mo1.5Si14B9Alloy

Melt Viscosity of the Soft Magnetic Nanocrystalline Fe72.5Cu1Nb2Mo1.5Si14B9Alloy

Fe-Si-B-P-C-Cu nanocrystalline soft magnetic powders with high B s and low core loss

Spatial Distributions of Alloying Elements Obtained from Atom Probe Tomography of the Amorphous Ribbon Fe75C11Si2B8Cr4

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Melt Viscosity of the Soft Magnetic Nanocrystalline Fe_72.5Cu₁Nb₂Mo_1.5Si₁₄B₉Alloy

Melt Viscosity of the Soft Magnetic Nanocrystalline Fe_72.5Cu₁Nb₂Mo_1.5Si₁₄B₉Alloy