Crystallization and Optimization of Soft Magnetic Properties Effect in FeSiB, FeNbSiB, FeCuNbSiB, FeCuZrCoSiB Amorphous Alloys

2010 ◽  
Vol 163 ◽  
pp. 225-228 ◽  
Author(s):  
P. Kwapuliński ◽  
Lucjan Pająk ◽  
Józef Lelątko ◽  
G. Badura ◽  
Józef Rasek ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Melt Spinning ◽  
Structural Changes ◽  
Optimization Process ◽  
Nanocrystalline Phase ◽  
Soft Magnetic Properties ◽  
Soft Magnetic ◽  
Thermally Activated ◽  
Diffusion Parameters ◽  
Melt Spinning Technique

The aim of the present paper is to find correlations between structural changes and electrical, mechanical and magnetic properties in Fe78Si13B9, Fe76Nb2Si13B9, Fe75Cu1Nb2Si13B9, Fe75Cu1Zr1Co1Si13B9, amorphous and nanocrystalline alloys obtained by melt spinning technique. The influence of annealing on material brittleness, magnetic and electric properties was examined. It was found that the optimization of soft magnetic properties effect is a thermally activated process and its diffusion parameters were determined. It was shown that for the alloys containing Cu, Nb and Zr as alloying additions, the optimization process can be attributed to formation of a nanocrystalline phase. In contrast to this for the FeSiB and FeNbSiB alloys the optimization process should be related to the relaxed amorphous phase.

Structural Studies of the Relaxed Amorphous Phase in the Fe81B14Nb5 Alloy

2013 ◽  
Vol 203-204 ◽  
pp. 380-385 ◽  
Author(s):  
Małgorzata Karolus
Keyword(s):  
Magnetic Properties ◽  
Amorphous Phase ◽  
Magnetic Permeability ◽  
Amorphous Alloys ◽  
Melt Spinning ◽  
Soft Magnetic Materials ◽  
Soft Magnetic Properties ◽  
Structural Studies ◽  
Soft Magnetic ◽  
Melt Spinning Technique

Amorphous alloys based on iron, obtained by melt spinning technique, are modern and very promising soft magnetic materials. The thermal annealing at temperatures closed to the crystallization temperature can cause an increase of magnetic permeability more than 10 times i.e. the so called enhancement of soft magnetic properties effect (ESMP). It is usually explained by formation of iron nanocrystallites in amorphous surroundings or by formation of the relaxed amorphous phase. Such a microstructure leads to averaging out of magnetic anisotropy and cause the ESMP.

scholarly journals Optimization of Soft Magnetic Properties in Fe-B and Fe-B-Si Amorphous Alloys Obtained by Melt Spinning Method

2002 ◽  
Vol 102 (2) ◽  
pp. 309-316 ◽  
Author(s):  
P. Kwapuliński ◽  
Z. Stokłosa ◽  
A. Chrobak ◽  
J. Rasek ◽  
G. Haneczok
Keyword(s):  
Magnetic Properties ◽  
Amorphous Alloys ◽  
Melt Spinning ◽  
Soft Magnetic Properties ◽  
Soft Magnetic

Preparation and Characterization of the Soft Magnetic FeCo-based Amorphous Alloy with Enhanced Magnetic Properties and Thermal Stability

2000 ◽  
Vol 644 ◽  
Author(s):  
Martin Hollmark ◽  
Victor Tkatch ◽  
Sergey Khartsev ◽  
Alex Grishin
Keyword(s):  
Thermal Stability ◽  
Magnetic Properties ◽  
Melt Spinning ◽  
Crystallization Process ◽  
Eutectic Reaction ◽  
Soft Magnetic ◽  
Differential Permeability ◽  
Thermal Stability Of ◽  
Melt Spinning Technique

AbstractA glassy structure was formed in the Fe40Co40P14B6 alloy by melt-spinning technique. The as-quenched 2-8 mm wide and 15-30 [.proportional]m thick ribbons exhibit good soft magnetic properties: the saturation magnetization of 1.45 T, the coercive force of 4 A/m and maximum differential permeability at 60 Hz of about 90000. The FeCo-based glass crystallizes via eutectic reaction into a mixture of an austenite and a b.c. tetragonal Fe3P-like phase similar to that of the well-known Fe40Ni40P14B6metallic glass, but at temperatures about 60 K higher than the latter. The evaluation of the thermodynamic and kinetic parameters of crystallization process brought us to the conclusion that the improved thermal stability of the Fe40Co40P14B6 glass is caused by the enhanced interfacial nucleus-glass energy.

EVOLUTION OF NANOGRAINS AND SOFT MAGNETIC PROPERTIES OF Fe74Cu0.8Nb2.7Si15.5B7 BY ISOTHERMAL ANNEALING

2011 ◽  
Vol 25 (14) ◽  
pp. 1241-1251 ◽  
Author(s):  
SHEIKH MANJURA HOQUE ◽  
UMASREE DHAR ◽  
M. A. HAKIM ◽  
D. K. SAHA ◽  
HARI NARAYAN DAS
Keyword(s):  
Magnetic Properties ◽  
Melt Spinning ◽  
Isothermal Annealing ◽  
Amorphous State ◽  
Initial Permeability ◽  
Soft Magnetic Properties ◽  
Soft Magnetic ◽  
Type Composition ◽  
Long Time ◽  
Short Time

Fe -based alloy of the composition, Fe 74 Cu 0.8 Nb 2.7 Si 15.5 B 7 has been studied thoroughly in order to research the evolution of nanograins and soft magnetic properties. The composition has been significantly deviated from FINEMET type composition given by Fe 73.5 Cu 1 Nb 3 Si 13.5 B 9. It is hard to optimize composition to obtain equally good soft magnetic properties as FINEMET significantly deviating from conventional type alloy. Fe -based alloy of the composition, Fe 74 Cu 0.8 Nb 2.7 Si 15.5 B 7 has been prepared by single roller melt spinning machine. X-ray diffraction studies confirmed that the ribbon is in the amorphous state. Evolution of α- Fe ( Si ) nanograins from amorphous matrix were carried out by isothermal annealing in the temperature range from 550°C to 650°C for 1, 3, 5, 10, 20, 30, 40, 50 and 60 minutes. Frequency spectrum of real and imaginary part of complex initial permeability has been measured for the samples at different annealing conditions. Short time annealing has been proved to be more efficient than long time annealing for the samples of this composition for most of the annealing temperatures.

Soft Magnetic Properties of Nanocrystalline Fe–Co–B–Si–Nb–Cu Alloys in Ribbon and Bulk Forms

2003 ◽  
Vol 18 (12) ◽  
pp. 2799-2806 ◽  
Author(s):  
Akihisa Inoue ◽  
Baolong Shen
Keyword(s):  
Magnetic Properties ◽  
Melt Spinning ◽  
Glassy Alloy ◽  
Nanocrystalline Alloy ◽  
Supercooled Liquid ◽  
Supercooled Liquid Region ◽  
Exothermic Peak ◽  
Liquid Region ◽  
Soft Magnetic Properties ◽  
Soft Magnetic

Ribbon and bulk nanocrystalline body-centered-cubic (bcc) (Fe,Co) alloys exhibiting good soft magnetic properties were synthesized in Fe71.5-xCoxB13.5Si10Nb4Cu1 system by the simple production processes of melt-spinning or casting and annealing. The glass-type alloys were formed in the Co content range below 30 at.%. These glassy alloys crystallized through two exothermic reactions. The first stage was due to the precipitation of nanoscale bcc-(Fe,Co) phase with a grain size of about 10 nm, and the second stage resulted from the decomposition of the remaining amorphous phase to α–(Fe,Co), (Fe,Co)2B, (Fe,Co)23B6, (Fe,Co)3Si, and (Fe,Co)2Nb phases. The glass transition temperature increased from 820 to 827 K with increasing Co content from 5 to 20 at.%, while the supercooled liquid region decreased slightly from 37 to 30 K because of the nearly constant crystallization temperature. By choosing the 10 at.% Co-containing alloy, we produced cylindrical glassy alloy rods 1.0 and 1.5 mm in diameter by copper mold casting. The subsequent annealing for 300 s at 883 K corresponding to the temperature just above the first exothermic peak caused the formation of nanoscale bcc-(Fe,Co) structure. The bcc-(Fe,Co) alloy rods exhibited good soft magnetic properties of 1.26 T for saturation magnetization and 5.0 A/m for coercive force, which were comparable to those for the corresponding bcc-(Fe,Co) alloy ribbon. The nanocrystalline alloy in a bulk form is encouraging for future use as a new type of soft magnetic material that requires three-dimensional shapes.

Influence of The Alloy Composition on The Magnetic Properties of Nanocrystalline Fe80M7B12Cu1 (M: Ti, Ta, Nb, Mo)

1999 ◽  
Vol 577 ◽  
Author(s):  
M. Kopcewicz ◽  
A. Grabias ◽  
B. Idzikowski
Keyword(s):  
Magnetic Properties ◽  
Annealing Temperature ◽  
Alloy Composition ◽  
Anisotropy Field ◽  
Nanocrystalline Phase ◽  
Soft Magnetic Properties ◽  
Soft Magnetic ◽  
Scanning Calorimetry ◽  
Rf Magnetic Field ◽  
Collapse Effect

ABSTRACTFormation of the nanocrystalline bcc Fe phase due to thermal treatment of the amorphous Fe80M7B12Cu1 (M: Ti, Ta, Nb, Mo) precursors is studied by the Mössbauer and differential scanning calorimetry techniques. The dependence of the formation of the bcc Fe phase on the alloy composition is discussed. In order to determine the optimal soft magnetic properties of these nanocrystalline alloys the rf-Mössbauer technique is used in which rf collapse effect induced by a radio-frequency (rf) magnetic field is employed. It was found that anisotropy fields in the nanocrystalline phase were smaller in Nb- and Mo-containing alloys as compared to the alloys which contain Ti or Ta. Variations of the anisotropy field vs. alloy composition and annealing temperature are discussed in detail.

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