Dynamic Compacting of Powders of Some Amorphous Alloys

AbstractAt present amorphous metallic alloys have the broad expansion in various fields of science&engineering as a result of their unique properties. In particular, soft magnetic amorphous alloys are extensively used in electrical engineering. However the production of considerable-size nonporous wares based on the powders (or tapes) of these alloys is heavy problem owing to high hardness of the particles. Therefore shock wave’s compacting or Dynamic Compacting (DC) method is promising one to produce the wares on the base of powders of amorphous alloys because it can provides high strength and near zero porosity of the wares. The experimental D-U diagrams of soft magnetic amorphous alloys were obtained to realize this method of compacting. The calculations of the amplitude and duration of shock wave were carried out. The several versions of explosive devices using shock plane wave generator to produce circular magnetic conductors were developed and were tested. These magnetic conductors are based on amorphous alloys of 5BDSR, GM414, 10NSR trademarks (Fe with Cu, Nb, Si, B additives). XRD analysis proved that amorphous state of the alloys remains the same up to 20 GPa shock wave’s pressures. The mechanical, structural, electrical and magnetic properties both initial amorphous alloys and compacted one were obtained and compared as a result of the implemented works. It was stated that DC leads to increase of magnetic conductivity by factor ∼15 with respect to initial amorphous alloys powder. Besides the specific losses decrease in ∼4 times.

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Analysis of the Samples of Fe-Cu-Nb-Si-B Amorphous Alloys Obtained by Dynamic Compacting Method

MRS Proceedings ◽

10.1557/proc-0903-z05-10 ◽

2005 ◽

Vol 903 ◽

Author(s):

Victor A. Golubev ◽

Andrey V. Strikanov ◽

Grigory A. Potemkin ◽

Ludmila V. Zueva ◽

Aleksey V. Golubev ◽

...

Keyword(s):

Shock Wave ◽

Amorphous Alloys ◽

Analysis Data ◽

Xrd Analysis ◽

Soft Magnetic ◽

Scanning Calorimetry ◽

Soft Magnetic Alloys ◽

Nano Crystalline ◽

The Impact ◽

Magnetic Conductivity

AbstractThe Dynamic Compacting (DC) method is promising method to produce considerable-size nonporous wares. The phenomenon is based on the impact of shock wave on the initial powders of amorphous alloys. Every time when the shock wave propagates through the bulk of substance then the temperature rises substantially. Therefore there is a need of study of the DC’s effect on the structure and properties of the amorphous alloys. The results of the thermal analysis (in particular, Differential Scanning Calorimetry) of the samples of the soft magnetic alloys are presented in the report. These results concern with amorphous alloys of 5BDSR, GM414, 10NSR trademarks before DC and after DC, respectively. It is shown there is single low-temperature endothermic peak (near 300C) and there are several high temperature exothermic peaks (near 540C, 650C, and 700C). The first peak is related to glass-transition, the following peaks are related to formation of nano-crystalline phases. It was proved by XRD analysis data. The optimal regimes of the thermal processing of final wares were chosen on the base of thermal- and XRD-analysis. The study of the effects of these regimes on the properties (magnetic conductivity, specific losses etc.) of the circular magnetic conductors was executed. In particular, thermal- as well as thermo-magnetic processing of magnetic conductors based on 5BDSR amorphous alloy (after DC) essentially improves their magnetic properties. For example, magnetic conductivity fÝ increases approximately by factor 17 with respect to the magnitude before DC.

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Investigation on the crystallization mechanism difference between FINEMET® and NANOMET® type Fe-based soft magnetic amorphous alloys

Journal of Applied Physics ◽

10.1063/1.4964433 ◽

2016 ◽

Vol 120 (14) ◽

pp. 145102 ◽

Cited By ~ 12

Author(s):

Yaocen Wang ◽

Yan Zhang ◽

Akira Takeuchi ◽

Akihiro Makino ◽

Yoshiyuki Kawazoe

Keyword(s):

Amorphous Alloys ◽

Crystallization Mechanism ◽

Soft Magnetic ◽

Soft Magnetic Amorphous Alloys

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Investigation of Amorphous/Crystalline State in Cu-Hf-Al Alloys

Materials Science Forum ◽

10.4028/www.scientific.net/msf.649.87 ◽

2010 ◽

Vol 649 ◽

pp. 87-92

Author(s):

E. Nagy ◽

Viktória Rontó ◽

Jenő Sólyom ◽

András Roósz

Keyword(s):

Amorphous Alloys ◽

Great Influence ◽

Amorphous State ◽

High Strength ◽

Al Alloys ◽

X Ray Diffraction ◽

X Ray ◽

Wide Range ◽

Different Shapes ◽

Important Purpose

Cu-Hf-Al alloys are considered to be relatively new ones among Cu-based bulk amorphous alloys. Cu-Hf-Al alloys have high strength in amorphous state and this property makes many applications feasible for the industry. During the production of amorphous alloys the most important purpose is to produce them in the biggest diameter to make them suitable for a wide range of applications. The circumstances of the production process have a great influence on the developing structure. In the present work solidification of Cu-Hf-Al alloys were investigated. The alloys were cast into different shapes with different Al contents with special regard to the appearance of the amorphous/crystalline structure. The appearance and the structure of crystalline phases were determined by X-ray diffraction and X-ray, DSC and metallographic measurements were used to investigate the developing structure.

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The magnetocaloric effect in soft magnetic amorphous alloys

Journal of Applied Physics ◽

10.1063/1.2709409 ◽

2007 ◽

Vol 101 (9) ◽

pp. 09C503 ◽

Cited By ~ 78

Author(s):

V. Franco ◽

J. S. Blázquez ◽

M. Millán ◽

J. M. Borrego ◽

C. F. Conde ◽

...

Keyword(s):

Magnetocaloric Effect ◽

Amorphous Alloys ◽

Soft Magnetic ◽

Soft Magnetic Amorphous Alloys

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B23-P-04High glass forming ability Fe-based soft magnetic amorphous alloys

Microscopy ◽

10.1093/jmicro/dfv278 ◽

2015 ◽

Vol 64 (suppl 1) ◽

pp. i113.2-i113

Author(s):

C. N. Kuo ◽

Y. H. Chen ◽

T. Y. Wei ◽

Y.L. Su ◽

J. C. Huang

Keyword(s):

Amorphous Alloys ◽

Glass Forming Ability ◽

Soft Magnetic ◽

Glass Forming ◽

Soft Magnetic Amorphous Alloys

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Giant Stress Impedance Magnetoelastic Sensors Employing Soft Magnetic Amorphous Ribbons

Materials ◽

10.3390/ma13092175 ◽

2020 ◽

Vol 13 (9) ◽

pp. 2175 ◽

Cited By ~ 2

Author(s):

Juan Jesús Beato-López ◽

Juan Garikoitz Urdániz-Villanueva ◽

José Ignacio Pérez-Landazábal ◽

Cristina Gómez-Polo

Keyword(s):

Amorphous Alloys ◽

Subsequent Development ◽

Young Modulus ◽

Amorphous Structure ◽

Rapid Quenching ◽

Soft Magnetic ◽

Highly Sensitive ◽

Magnetoelastic Sensors ◽

Soft Magnetic Amorphous Alloys

Soft magnetic amorphous alloys obtained via rapid quenching techniques are widely employed in different technological fields such as magnetic field detection, bio labeling, non-contact positioning, etc. Among them, magnetoelastic applications stand out due to excellent mechanical properties exhibited by these alloys, resulting from their amorphous structure, namely, their high Young modulus and high tensile strength. In particular, the giant stress impedance (GSI) effect represents a powerful tool to develop highly sensitive magnetoelastic sensors. This effect is based on the changes in the high-frequency electric impedance as the result of the variation in magnetic permeability of the sample under the action of mechanical stresses. In this work, the GSI effect is analyzed in two soft magnetic ribbons ((Co0.93 Fe0.07)75 Si12.5 B12.5 and (Co0.95 Fe0.05)75 Si12.5 B12.5) for the subsequent development of two practical devices: (i) the characterization of the variations in the cross-section dimensions of irregularly shaped elements, and (ii) the design of a flow meter for measuring the rate of flow of water through a pipe.

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Microstructure and Magnetic Properties of CoFeHfO Rich Nanocrystalline Thin Films Application for High Frequency

Materials Science Forum ◽

10.4028/www.scientific.net/msf.558-559.975 ◽

2007 ◽

Vol 558-559 ◽

pp. 975-978

Author(s):

L.V. Tho ◽

K.E. Lee ◽

Cheol Gi Kim ◽

Chong Oh Kim ◽

W.S. Cho

Keyword(s):

Thin Film ◽

Thin Films ◽

Magnetic Properties ◽

Rf Sputtering ◽

Xrd Analysis ◽

X Ray Diffraction ◽

Soft Magnetic ◽

Electrical And Magnetic Properties ◽

Transmission Electron ◽

Nanocrystalline Thin Films

Nanocrystalline CoFeHfO thin films have been fabricated by RF sputtering method. Co52Fe23Hf10O15 thin film is observed, exhibit good magnetic properties with magnetic coercivity (Hc) of 0.18 Oe; anisotropy fild (Hk) of 49 Oe; saturation magnetization (4лMs) of 21 kG, and electrical resistivity (ρ) of 300 01cm. The frequency response of permeability of the film is excellent. The effect of microstructure on the electrical and magnetic properties of thin film was studied using X-ray diffraction (XRD) analysis and conventional transmission electron microscopy (TEM). The results showed that excellent soft magnetic properties were associated with granular nannoscale grains of α-CoFe and α-Co(Fe) phases.

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