The Experts below are selected from a list of 8610 Experts worldwide ranked by ideXlab platform
Gaoyuan Ouyang - One of the best experts on this subject based on the ideXlab platform.
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review of fe 6 5 wt si high silicon steel a promising Soft Magnetic Material for sub khz application
Journal of Magnetism and Magnetic Materials, 2019Co-Authors: Yongfeng Liang, Gaoyuan Ouyang, Chad R MacziewskiAbstract:Abstract To meet the growing need for energy efficiency in power electronics and electric machines, a number of new Soft Magnetic Materials are being investigated. Among them, high silicon Fe-Si alloy has been recognized as a promising candidate for low-to-medium-frequency applications. Compared to the currently most widely used 3 wt% silicon steel, the steel containing 6.5 wt% Si possesses more favorable properties, including high electrical resistivity, good saturation magnetization, and near-zero magnetostriction. However, the high silicon content facilitates the formation of ordered phases, resulting in severe brittleness that prohibits mass production using the economical conventional processing methods. A number of new processing routes have been investigated and inspiring progress has been made. Prototypes of motors and transformers using high silicon steel have been demonstrated with improved efficiency and power density. If the processing cost and limitations of size and shape are properly addressed, high silicon steel is expected to be widely adopted by the industries. Among all the investigated processing techniques, rapid solidification appears to be the most cost-effective method for mass producing thin sheet of high silicon steel. This paper reviews the current state-of-the-art of the Fe-Si based Soft Magnetic Materials including their history, structure, properties, processing, and applications.
Akihisa Inoue - One of the best experts on this subject based on the ideXlab platform.
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new fe based bulk glassy alloys with high saturated Magnetic flux density of 1 4 1 5 t
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2004Co-Authors: Akihisa Inoue, Baolong ShenAbstract:New Fe-based bulk glassy alloys with high saturated Magnetic flux density (B s ) were synthesized in (Fe 0.75 B 0.15 Si 0.1 ) 100-x M x (M = Nb or Zr; 2-4 at.% Nb or 1 at.% Zr) systems by copper mold casting. The addition of such small amounts of Nb or Zr causes the appearance of the glass transition and supercooled liquid region before crystallization. The glass transition temperature (T g ) and crystallization temperature (T x ) increased with increasing Nb content and the more significant increase in T x as compared with T g resulted in a maximum ΔT x (= T x - T g ) value of 50 K at 4 at.% Nb. The liquidus temperature (T l ) also shows a significant change with Nb content and the 4 at.% Nb alloy shows the lowest T l of 1374 K. The highest T g /T l of 0.61 was obtained for the 4 at.% Nb alloy. The maximum diameter of the cast glassy alloy rod was 1 mm for the 2% Nb alloy and 1.5 mm for the 4 at.% Nb alloy. The Nb- and Zr-containing bulk glassy alloys exhibit good Soft Magnetic properties of 1.40-1.53 T for B s , 2.8-3.7 A/m for coercive force and 14,400-17.300 for permeability at 1 kHz. The success of synthesizing the new Fe-based glassy alloys exhibiting simultaneously high glass-forming ability, a large supercooled liquid region and the lowest T l as well as good Soft Magnetic properties combined with high B, allows us to expect future progress as a new type of Soft Magnetic Material.
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origin of low coercivity of fe al ga p c b si ge bulk glassy alloys
Materials Transactions, 2003Co-Authors: Teruo Bitoh, Akihiro Makino, Akihisa InoueAbstract:The Magnetic properties of the glassy Fe-(Al, Ga)-(P, C, B, Si, Ge) alloys have been compared with those of the conventional Fe-based amorphous alloys to clarify the feature of the glassy alloys as a Soft Magnetic Material. The glassy Fe-(Al, Ga)-(P, C, B, Si, Ge) alloys exhibit lower saturation magnetization (Js) than that of the conventional Fe-(B, Si, C) amorphous alloys with the same Fe content. The glassy alloys also have larger saturation magnetostriction constant (� s) than that of the conventional Fe-based amorphous alloys with the same Js. However, the
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formation and Soft Magnetic properties of fe b si zr bulk glassy alloys with high saturation magnetization above 1 5 t
Materials Transactions, 2002Co-Authors: Akihisa Inoue, Baolong ShenAbstract:A new Fe-based bulk glassy alloy with good Soft Magnetic properties and high saturation magnetization (I s ) above 1.5 T was formed at the composition of (Fe 0.75 B 0.15 Si 0.1 ) 99 Zr 1 . The addition of I at%Zr to Fe 75 B 15 Si 10 caused the appearance of glass transition (T g ) at 815 K, followed by a supercooled liquid region (ΔT x (= T x - T g )) of 52 K, in addition to a decrease of Curie temperature (T c ) from 714 to 688 K and an increase of crystallization temperature (T x ) from 845 to 868 K. The reduced glass transition temperature (T g /T l ) was measured as 0.59. The increase in the supercooled liquid region enabled us to form bulk glassy alloy rods in the diameter range up to 0.75 mm by the copper mold casting method. The T c , T g , ΔT x and crystallization peak behavior for the bulk glassy alloy rods are nearly the same as those for the corresponding ribbon sample. The bulk glassy alloy rods exhibit high I s of 1.53 T and low coercive force (H c ) of 2.8 A/m which are comparable to commercial Fe-based amorphous alloy ribbons. The good combination of the new Fe-based alloy composition, high glass-forming ability and good Soft Magnetic properties indicates that the new bulk glassy alloy may be used as a new type of Soft Magnetic Material.
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Soft Magnetic properties of fe co re b amorphous alloys with a large supercooled liquid region
Materials Transactions, 2001Co-Authors: Wei Zhang, Akihisa InoueAbstract:Fe-based amorphous alloys with high B concentrations in (Fe, Co)-RE-B system were found to exhibit a large supercooled liquid region (ΔT x ) in a composition range 22.5-30 at%B, 0-30 at%Co and 2.5-6 at%RE. The ΔT x values exceeding 50K were obtained for a series of Fe 62 Co 9.5 RE 3.5 B 25 (RE = Pr, Nd, Sm, Gd, Tb, Dy, Er) amorphous alloys. The Fe 62 Co 9.5 RE 3.5 B 25 amorphous alloys exhibit good Soft Magnetic properties of 1.35 to 1.43 T for saturation magnetization, 1.0 to 3.8 A/m for coercive force, and 8300 to 12500 for permeability at 1 kHz in the annealed state for 600 s at 773 K. The synthesis of the (Fe,Co)-RE-B amorphous alloys exhibiting a large supercooled liquid region and good Soft Magnetic properties with a high saturation magnetization is promising for future development as a new type of Soft Magnetic Material.
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nanocrystalline structural evolution in fe90zr7b3 Soft Magnetic Material
Acta Materialia, 1996Co-Authors: Yan Zhang, Akihiro Makino, Akihisa Inoue, K Hono, T SakuraiAbstract:Abstract Primary crystallization process of an Fe90Zr7B3 amorphous alloy has been studied by atom probe field ion microscopy (APFIM) and transmission electron microscopy (TEM). It is confirmed that two phases coexist at the stage with optimum Magnetic properties, one is the α-Fe phase and the other is the amorphous phase enriched with Zr and B. Zr is almost completely rejected from the α-Fe phase, but some amount of B remains dissolved in the α-Fe phase. The as-quenched alloy is amorphous possibly with the median range order (MRO) structure. Unlike previously published results, no evidence for compositional decomposition prior to the crystallization reaction was found. This suggests that the crystallization progress by the nucleation and growth mechanism, and that redistribution of Zr and B from the crystallized phase to the amorphous matrix controls the grain growth. In fact, during the nucleation and growth stage, enrichment of Zr was found in front of the growing interface of the α-Fe particles, suggesting that the grain growth was controlled by the diffusion of Zr.
Hrvoje Glavaš - One of the best experts on this subject based on the ideXlab platform.
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Advantages of Dual Hyperbolic Tangent Function Over Single Hyperbolic Tangent Function in Description of Hysteresis LoopsAdvantages of Dual Hyperbolic Tangent Function Over Single Hyperbolic Tangent Function in Description of Hysteresis Loops
International Review of Electrical Engineering-iree, 2016Co-Authors: Tomislav Barić, Vedran Boras, Hrvoje GlavašAbstract:If the mathematical description of the Magnetic hysteresis loop branches should be simple, easy to use and should credibly describe the waveform Magnetic hysteresis loop with a minimum number of parameters, then it inevitably leads to the description of Magnetic hysteresis loop branches with a hyperbolic tangent function. This paper presents the advantages in description of Magnetic hysteresis loop branches with a hyperbolic tangent function over other functions. The advantages in description of Magnetic hysteresis loop branches with dual hyperbolic tangent function versus description with a single hyperbolic tangent function when the Magnetic hysteresis loop has a very pronounced saturation region are provided. Also, this paper presents numerical difficulties in describing of Magnetic hysteresis loop branches with a hyperbolic tangent function. Using Soft Magnetic Material, as an example, a numerical procedure for determining parameters in description of Magnetic hysteresis loop branches with a single and two hyperbolic tangent functions is shown. The numerical results are analyzed and discussed.
Chad R Macziewski - One of the best experts on this subject based on the ideXlab platform.
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review of fe 6 5 wt si high silicon steel a promising Soft Magnetic Material for sub khz application
Journal of Magnetism and Magnetic Materials, 2019Co-Authors: Yongfeng Liang, Gaoyuan Ouyang, Chad R MacziewskiAbstract:Abstract To meet the growing need for energy efficiency in power electronics and electric machines, a number of new Soft Magnetic Materials are being investigated. Among them, high silicon Fe-Si alloy has been recognized as a promising candidate for low-to-medium-frequency applications. Compared to the currently most widely used 3 wt% silicon steel, the steel containing 6.5 wt% Si possesses more favorable properties, including high electrical resistivity, good saturation magnetization, and near-zero magnetostriction. However, the high silicon content facilitates the formation of ordered phases, resulting in severe brittleness that prohibits mass production using the economical conventional processing methods. A number of new processing routes have been investigated and inspiring progress has been made. Prototypes of motors and transformers using high silicon steel have been demonstrated with improved efficiency and power density. If the processing cost and limitations of size and shape are properly addressed, high silicon steel is expected to be widely adopted by the industries. Among all the investigated processing techniques, rapid solidification appears to be the most cost-effective method for mass producing thin sheet of high silicon steel. This paper reviews the current state-of-the-art of the Fe-Si based Soft Magnetic Materials including their history, structure, properties, processing, and applications.
Tomislav Barić - One of the best experts on this subject based on the ideXlab platform.
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Advantages of Dual Hyperbolic Tangent Function Over Single Hyperbolic Tangent Function in Description of Hysteresis LoopsAdvantages of Dual Hyperbolic Tangent Function Over Single Hyperbolic Tangent Function in Description of Hysteresis Loops
International Review of Electrical Engineering-iree, 2016Co-Authors: Tomislav Barić, Vedran Boras, Hrvoje GlavašAbstract:If the mathematical description of the Magnetic hysteresis loop branches should be simple, easy to use and should credibly describe the waveform Magnetic hysteresis loop with a minimum number of parameters, then it inevitably leads to the description of Magnetic hysteresis loop branches with a hyperbolic tangent function. This paper presents the advantages in description of Magnetic hysteresis loop branches with a hyperbolic tangent function over other functions. The advantages in description of Magnetic hysteresis loop branches with dual hyperbolic tangent function versus description with a single hyperbolic tangent function when the Magnetic hysteresis loop has a very pronounced saturation region are provided. Also, this paper presents numerical difficulties in describing of Magnetic hysteresis loop branches with a hyperbolic tangent function. Using Soft Magnetic Material, as an example, a numerical procedure for determining parameters in description of Magnetic hysteresis loop branches with a single and two hyperbolic tangent functions is shown. The numerical results are analyzed and discussed.