Effects of annealing temperature on the microstructure and initial permeability of nanocrystalline alloy Fe73.5Cu1Mo3Si13.5B9

Fe 81 Zr 9 B 10 and Fe 81 Zr 7 Nb 2 B 10 amorphous alloys were prepared by melt-spinning. The microstructures and magnetic properties of the alloys annealed at various temperatures were investigated by X-ray diffraction (XRD) and vibrating sample magnetometer (VSM). The crystallization progresses of Fe 81 Zr 9 B 10 and Fe 81 Zr 7 Nb 2 B 10 amorphous alloys are as follows: amorphous → residual amorphous + α- Fe → α- Fe + Fe 3 Zr + ZrFe 2 and amorphous → residual amorphous + α- Fe → α- Fe + Fe 2 Zr , respectively. The grain size (D) of α- Fe in Fe 81 Zr 7 Nb 2 B 10 alloy is smaller than that in Fe 81 Zr 9 B 10 alloy at every annealing stage. The change trend of specific saturation magnetization (Ms) of Fe 81 Zr 7 Nb 2 B 10 alloy with increasing annealing temperature (Ta) is the same as that of Fe 81 Zr 9 B 10 alloy. However, the change trend of coercivity (Hc) of Fe 81 Zr 7 Nb 2 B 10 alloy with increasing annealing temperature is different from that of Fe 81 Zr 9 B 10 alloy, which abruptly deteriorates at 600°C.

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

International Journal of Modern Physics B ◽

10.1142/s0217979221502118 ◽

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.

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

Materials Science Forum ◽

10.4028/www.scientific.net/msf.864.60 ◽

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.

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Influence of annealing temperature on nanocrystalline alloy’s excess loss parameters

International Journal of Applied Electromagnetics and Mechanics ◽

10.3233/jae-201532 ◽

2020 ◽

pp. 1-11

Author(s):

Xiwei Zhang ◽

Lin Li ◽

Jian Pang

Keyword(s):

Annealing Temperature ◽

Equivalent Stress ◽

Nanocrystalline Alloy ◽

Stress Relief ◽

Separation Principle ◽

Excess Loss ◽

Annealing Temperatures ◽

Optimal Annealing Temperature ◽

Different Temperatures ◽

Ac Magnetization

In this paper, both nanocrystalline alloy (Fe73.5Cu1Nb3Si15.5B7) ribbon samples and toroidal samples (wound ribbon) are annealed at different temperatures in order to consider the influence of inner stress on the magnetization properties. Then the AC magnetization properties of these samples are measured. Combined with the measured results, the influence of inner stress on nanocrystalline alloy’s microstructure is analyzed quantitatively based on the loss separation principle and the statistical theory of loss. By comparing measured macroscopic magnetization characteristics and excess loss, the equivalent stress state of the toroidal sample is evaluated. Furthermore, two kinds of samples’ excess loss under different annealing temperatures are analyzed, and the effectiveness of stress relief at optimal annealing temperature is validated.

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Influence of Milling Time on the Crystallization, Morphology and Magnetic Properties of Polycrystalline Yttrium Iron Garnet

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.501.324 ◽

2012 ◽

Vol 501 ◽

pp. 324-328 ◽

Cited By ~ 12

Author(s):

Rodziah Nazlan ◽

Mansor Hashim ◽

Nor Hapishah Abdullah ◽

Idza Riati Ibrahim ◽

Ismayadi Ismail

Keyword(s):

Yttrium Iron Garnet ◽

Annealing Temperature ◽

Milling Time ◽

Magnetic Loss ◽

Milled Powder ◽

High Energy ◽

Initial Permeability ◽

Complex Permeability ◽

Yttrium Iron ◽

Iron Garnet

The polycrystalline Yttrium Iron Garnet (YIG) powder with the chemical formula Y3Fe5O12 has been synthesized by using High Energy Ball Milling technique. The effect of various preparation parameters on the crystallinity, morphology and complex permeability of YIG, which includes milling time and annealing temperature were studied respectively by using XRD, SEM and Impedance Material Analyzer. The frequency dependence of complex permeability namely real permeability, µ’ and magnetic loss, µ’’ were measured at room temperature for samples sintered from 600°C to 1400°C, in the frequency range 10 MHz to 1 GHz. The results showed that milling time plays a role in determining the crystallinity of the milled powder where higher milling time results in better crystallinity due to high reactivity of the particles. From complex permeability measurement, it was observed that the initial permeability and magnetic loss increased with increasing grain size. The permeability values increased with annealing temperature and the absolute values of permeability decreased after attaining the natural resonance frequency of the material.

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Effect of annealing temperature on structure and high-temperature soft magnetic properties of (Fe0.9Co0.1)72.7Al0.8Si13.5Cu1Nb3B8V1 nanocrystalline alloy

Materials Research Bulletin ◽

10.1016/j.materresbull.2021.111212 ◽

2021 ◽

Vol 138 ◽

pp. 111212

Author(s):

Yan Zhang ◽

Zhi Wang ◽

Xian-hua Li ◽

Qian-qian Hao ◽

Rui-min Shi

Keyword(s):

Magnetic Properties ◽

High Temperature ◽

Annealing Temperature ◽

Nanocrystalline Alloy ◽

Soft Magnetic Properties ◽

Soft Magnetic

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Nucleation of Disorder in Fe3Al Alloys

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100061574 ◽

1967 ◽

Vol 25 ◽

pp. 312-313

Author(s):

P. R. Swann ◽

W. R. Duff ◽

R. M. Fisher

Keyword(s):

Electron Microscopy ◽

Transmission Electron Microscopy ◽

Annealing Temperature ◽

Antiphase Domain ◽

Effect Of Temperature ◽

Domain Structures ◽

Transmission Electron ◽

Domain Boundaries ◽

Higher Temperature ◽

The One

Recently we have investigated the phase equilibria and antiphase domain structures of Fe-Al alloys containing from 18 to 50 at.% Al by transmission electron microscopy and Mössbauer techniques. This study has revealed that none of the published phase diagrams are correct, although the one proposed by Rimlinger agrees most closely with our results to be published separately. In this paper observations by transmission electron microscopy relating to the nucleation of disorder in Fe-24% Al will be described. Figure 1 shows the structure after heating this alloy to 776.6°C and quenching. The white areas are B2 micro-domains corresponding to regions of disorder which form at the annealing temperature and re-order during the quench. By examining specimens heated in a temperature gradient of 2°C/cm it is possible to determine the effect of temperature on the disordering reaction very precisely. It was found that disorder begins at existing antiphase domain boundaries but that at a slightly higher temperature (1°C) it also occurs by homogeneous nucleation within the domains. A small (∼ .01°C) further increase in temperature caused these micro-domains to completely fill the specimen.

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Transmission Electron Microscopy studies of the vacancy ordering in YSI2-X thin films

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100087124 ◽

1991 ◽

Vol 49 ◽

pp. 562-563

Author(s):

F.-R. Chen ◽

T. L. Lee ◽

L. J. Chen

Keyword(s):

Crystal Structure ◽

Electron Microscopy ◽

Thin Films ◽

Diffraction Pattern ◽

Annealing Temperature ◽

Lattice Mismatch ◽

Si Substrate ◽

Metal Thin Films ◽

Transmission Electron ◽

Vacancy Ordering

YSi2-x thin films were grown by depositing the yttrium metal thin films on (111)Si substrate followed by a rapid thermal annealing (RTA) at 450 to 1100°C. The x value of the YSi2-x films ranges from 0 to 0.3. The (0001) plane of the YSi2-x films have an ideal zero lattice mismatch relative to (111)Si surface lattice. The YSi2 has the hexagonal AlB2 crystal structure. The orientation relationship with Si was determined from the diffraction pattern shown in figure 1(a) to be and . The diffraction pattern in figure 1(a) was taken from a specimen annealed at 500°C for 15 second. As the annealing temperature was increased to 600°C, superlattice diffraction spots appear at position as seen in figure 1(b) which may be due to vacancy ordering in the YSi2-x films. The ordered vacancies in YSi2-x form a mesh in Si plane suggested by a LEED experiment.

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