Study on nanocrystalline grain size and quantitative change in Fe–Cu–Mo–Si–B soft magnetic alloy

2021 ◽  
Author(s):  
Jong Su Kim ◽  
Tong Son Yom ◽  
Myong Hak Kim
Keyword(s):  
Grain Size ◽  
Annealing Temperature ◽  
Volume Fraction ◽  
Initial Permeability ◽  
Nanocrystalline Phase ◽  
Magnetic Alloy ◽  
Soft Magnetic ◽  
Soft Magnetic Alloy ◽  
Ultrafine Structure ◽  
Si Content

In this paper, we studied the grain size and volume fraction change of [Formula: see text]-Fe(Si) nanocrystalline phase as a function of Cu, Mo and Si content in Fe[Formula: see text]Cu[Formula: see text]Mo3Si[Formula: see text]B9, Fe[Formula: see text]Cu1Mo[Formula: see text]Si[Formula: see text]B9, Fe[Formula: see text]Cu1Mo3Si[Formula: see text]B[Formula: see text], and also the annealing temperature and time in Fe[Formula: see text]Cu1Mo3Si[Formula: see text]B9 alloy. Cu is an element promoting ultrafine structure and crystallization progresses, it causes the grain size of the [Formula: see text]-Fe(Si) phase to decrease suddenly, the volume fraction of [Formula: see text]-Fe(Si) phase to increase only by adding 0.5 at.% Cu. Also, Mo causes the grain size of [Formula: see text]-Fe(Si) phase to decrease like Cu, while suppressing the increase of the volume fraction of [Formula: see text]-Fe(Si) phase, Si has no little effect on the grain size of [Formula: see text]-Fe(Si) phase, diffuses into the inner part of [Formula: see text]-Fe(Si) phase upto Si 13.5 at.%, but suddenly increases grain size above Si 13.5 at.%. The microstructure of Fe[Formula: see text]Cu1Mo3Si[Formula: see text]B9 alloy is nearly completed at 520[Formula: see text]C for about 20 min, the grain size is approximately 13.8–14.1 nm, the volume fraction of [Formula: see text]-Fe(Si) phase is within 61–66%, initial permeability at 1 kHz is within 59,800–61,100.

NILOMAG 77

Alloy Digest ◽  
1995 ◽  
Vol 44 (10) ◽  
Keyword(s):  
Physical Properties ◽  
Tensile Properties ◽  
Heat Treating ◽  
Initial Permeability ◽  
Magnetic Alloy ◽  
Soft Magnetic ◽  
Soft Magnetic Alloy ◽  
High Level

Abstract NILOMAG ALLOY 77 is a 77 Ni soft magnetic alloy with a high level of initial permeability. This datasheet provides information on composition, physical properties, hardness, and tensile properties. It also includes information on heat treating. Filing Code: Ni-488. Producer or source: Inco Alloys International Inc.

MICROSTRUCTURE EVALUATION OF Fe-BASED AMORPHOUS ALLOYS INVESTIGATED BY DOPPLER BROADENING POSITRON ANNIHILATION TECHNIQUE

2013 ◽  
Vol 27 (19) ◽  
pp. 1341014
Author(s):  
WEI LU ◽  
PING HUANG ◽  
YUXIN WANG ◽  
BIAO YAN
Keyword(s):  
Grain Size ◽  
Positron Annihilation ◽  
Amorphous Alloys ◽  
Annealing Temperature ◽  
Amorphous Matrix ◽  
Nanocrystalline Phase ◽  
Magnetic Alloy ◽  
Type I ◽  
Doppler Broadening ◽  
Average Grain Size

Microstructure of Fe -based amorphous and nanocrystalline soft magnetic alloy has been investigated by X-ray diffraction (XRD), transmission electronic microscopy (TEM) and Doppler broadening positron annihilation technique (PAT). Doppler broadening measurement reveals that amorphous alloys (Finemet, Type I) which can form a nanocrystalline phase have more defects (free volume) than alloys (Metglas, Type II) which cannot form this microstructure. XRD and TEM characterization indicates that the nanocrystallization of amorphous Finemet alloy occurs at 460°C, where nanocrystallites of α- Fe with an average grain size of a few nanometers are formed in an amorphous matrix. With increasing annealing temperature up to 500°C, the average grain size increases up to around 12 nm. During the annealing of Finemet alloy, it has been demonstrated that positron annihilates in quenched-in defect, crystalline nanophase and amorphous-nanocrystalline interfaces. The change of line shape parameter S with annealing temperature in Finemet alloy is mainly due to the structural relaxation, the pre-nucleation of Cu nucleus and the nanocrystallization of α- Fe ( Si ) phase during annealing. This study throws new insights into positron behavior in the nanocrystallization of metallic glasses, especially in the presence of single or multiple nanophases embedded in the amorphous matrix.

The effect of rapid solidification by spinning and laser melting On the structure of sendust-type alloys

1994 ◽  
Vol 362 ◽  
Author(s):  
Elena N. Sheftel ◽  
Dmitry E. Kaputkin ◽  
Raissa E. Stroug
Keyword(s):  
Solid Solution ◽  
Grain Size ◽  
Wear Resistance ◽  
Rapid Solidification ◽  
Magnetic Alloy ◽  
Dispersion Strengthening ◽  
Soft Magnetic ◽  
Laser Melting ◽  
Soft Magnetic Alloy ◽  
Boride Phases

AbstractDispersion strengthening of the most wear-resistant soft magnetic alloy Sendust (Fe-9.5 wt.%Si -5.5 wt.% Al, HV=5000 MPa) by carbide and boride phases allowed to increase its wear-resistance by a factor of 2 to 3. Hardness of the dispersion strengthened alloys is HV=5500–6250 MPa. The changes in grain size, ordering and hardness of the Sendust and two dispersion strengthened alloys have been studied after spinning and various regimes of laser melting. Both types of rapid solidification caused a significant decrease of both the solid solution grain size and the size of carbide and boride phases. While spinning only significantly decreased the amount of ordered Fe3(Si,Al) phase in all the alloys, laser melting completely suppressed the ordering. The hardness of the boride strengthened alloy increased up to 7550 MPa after laser melting.

CARPENTER HYMU 80 ALLOY

Alloy Digest ◽  
1989 ◽  
Vol 38 (10) ◽  
Keyword(s):  
Fracture Toughness ◽  
Physical Properties ◽  
Tensile Properties ◽  
Heat Treating ◽  
Initial Permeability ◽  
Hysteresis Loss ◽  
Magnetic Alloy ◽  
Soft Magnetic ◽  
Soft Magnetic Alloy ◽  
Maximum Permeability

Abstract CARPENTER HyMu 80 alloy is an unoriented soft magnetic alloy with extremely high initial permeability as well as maximum permeability with minimum hysteresis loss. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on forming, heat treating, machining, and joining. Filing Code: Ni-375. Producer or source: Carpenter.

Evolution of the Structure and Physical Properties of the Nanocrystalline Soft Magnetic Alloy

2016 ◽  
Vol 864 ◽  
pp. 60-64
Author(s):  
Vladimir Tsepelev ◽  
Yuri Starodubtsev ◽  
Victor Konashkov
Keyword(s):  
Heat Treatment ◽  
Physical Properties ◽  
Annealing Temperature ◽  
Nanocrystalline Alloy ◽  
Ferromagnetic Phase ◽  
Magnetic Alloy ◽  
Soft Magnetic ◽  
Soft Magnetic Alloy ◽  
Thermomagnetic Analysis ◽  
Nanocrystalline Soft Magnetic Alloy

The structure and physical properties of the Fe72.5Cu1Nb2Mo1.5Si14B9 nanocrystalline alloy have been studied both in terms of dynamics, using thermomagnetic analysis and statics, using specimens subjected to a complete course of heat treatment at the specified annealing temperature. In the course of nanocrystallization, there was a peak detected on the curve of permeability, that peak appeared several minutes later than the heat production peak. The permeability peak occurrence can be related to the formation of a sufficiently large amount of the crystalline ferromagnetic phase α-FeSi followed by saturating it with silicon due to diffusion.

HIPERCO 50HS

Alloy Digest ◽  
1998 ◽  
Vol 47 (6) ◽  
Keyword(s):  
Grain Size ◽  
Physical Properties ◽  
Tensile Properties ◽  
Heat Treating ◽  
Magnetic Alloy ◽  
Soft Magnetic ◽  
Soft Magnetic Alloy

Abstract Hiperco 50HS is an improved soft magnetic alloy with a finer grain size that produces greater strengths than those found in Hiperco 50 (Alloy Digest Co-83, February 1988). This datasheet provides information on composition, physical properties, and tensile properties. It also includes information on heat treating. Filing Code: CO-105. Producer or source: Carpenter. Originally published March 1998, corrected June 1998.

Processing-Structure Correlations of Ni-Fe-Cu-Cr Soft Magnetic Alloy

2005 ◽  
Vol 23 ◽  
pp. 223-226 ◽  
Author(s):  
Zhou Wei ◽  
Oh Joo Tien ◽  
Hng Huey Hoon
Keyword(s):  
Grain Size ◽  
Magnetic Properties ◽  
High Energy ◽  
Initial Permeability ◽  
Magnetic Alloy ◽  
Soft Magnetic Alloy ◽  
Structure Correlations ◽  
Average Grain Size ◽  
Magnetic Softness ◽  
Cr System

Nickel-based alloy is an important class of magnetic materials that have high permeability, large saturation and remnant magnetization, low hysteresis loss and low coercivity. These properties vary with the grain size, shape, magnetic domains and orientation. As the grain approaches nanoscale, an important averaging of the magnetocrystalline anisotropy over many grains coupled within an exchange length results in a significant increase of the magnetic softness and the effect of the internal thermal energy becomes more pronounced. The crystalline Ni-Fe-Cu-Cr system processed by high-energy ball milling (HEBM) and metal injection moulding (MIM)were investigated using TEM and SEM. The average grain size of the HEBM samples was found to be in the order of several tens of nanometers while those of the MIM are in the order of tens of micrometers. The magnetic properties of the HEBM and MIM samples were also investigated. The magnetic properties of the HEBM samples are significantly ‘softer’ magnetically when compared to the MIM samples. The coercivity (Hc) of MIM sample is 37.5 Oe while the HEBM sample is 17.5 Oe. More remarkably, the initial permeability (µi) of the HEBM sample is an order higher than the MIM sample 2184 and 225 Oe respectively.

Research on Motor with Nanocrystalline Soft Magnetic Alloy Stator Cores

2019 ◽  
Vol 139 (10) ◽  
pp. 873-879 ◽  
Author(s):  
Tsuyoshi Nonaka ◽  
Shingo Zeze ◽  
Shogo Makino ◽  
Motomichi Ohto
Keyword(s):  
Magnetic Alloy ◽  
Soft Magnetic ◽  
Soft Magnetic Alloy ◽  
Nanocrystalline Soft Magnetic Alloy
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