Effect of Nb addition on the structure and soft magnetic properties of melt-spun Co 69Fe 7Si 14B 10 alloy (original) (raw)
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Magnetic properties of B-rich (Fe, Co)–Nb–B amorphous alloys
Journal of Alloys and Compounds, 2009
The magnetic properties of melt spun Fe 52−x Co 10+x Nb 8 B 30 (x = 0, 12, 24, 36) amorphous ribbons are presented and discussed. The Curie temperature together with the saturation magnetization exhibited a progressive decrease with increasing Co addition (from 631 to 512 K and from 1.24 to 0.53 T, respectively). On the other hand, the ac initial magnetic permeability displayed a diminishing trend with increasing Co content, from 7500 to 1500 at f = 0.5 kHz together with a relaxation frequency variation between 2 and 7 kHz. In addition, the alloys magnetostriction showed a decreasing tendency with increasing cobalt concentration. Results are interpreted on the basis of the detrimental effect of Co on the intrinsic magnetic properties of the alloy series.
Journal of Alloys and Compounds, 2011
Recently bulk amorphous alloys have attracted great attention due to their excellent magnetic properties. The glass-forming ability of bulk amorphous alloys depends on the temperature difference ( T x ) between glass transition temperature (T g ) and crystallization temperature (T x ). The increase of T x causes a decrease of the critical cooling rate (V c ) and growth of the maximum casting thickness of bulk amorphous alloys. The aim of the present paper is to characterize the structure, the thermal stability and magnetic properties of Fe 36 Co 36 B 19 Si 5 Nb 4 bulk amorphous alloys using XRD, Mössbauer spectroscopy, DSC and VSM methods. Additionally the magnetic permeability i (at force H ≈ 0.5 A/m and frequency f ≈ 1 kHz) and the intensity of disaccommodation of magnetic permeability / (t 1 ) ( = (t 1 = 30 s) − (t 2 = 1800 s)), have been measured, where is the initial magnetic permeability measured at time t after demagnetisation, the Curie temperature T C and coercive force H c of rods are also determined with the use of a magnetic balance and coercivemeter, respectively.
Soft Magnetic Properties of Co-Based Amorphous Alloy by Two-Step Cooling Method
physica status solidi (a), 2002
The soft magnetic properties of Co-based amorphous Co 66 Fe 4 Ni 1 Si 15 B 14 alloy in terms of various annealing conditions have been investigated by magnetoimpedance (MI) effect and permeability ratio (PR). In order to enhance the soft magnetic properties by co-reducing internal thermal stress and magnetic ordering, we applied the furnace cooling to Curie temperature and subsequent water quenching (F&W) method, which considerably increased the initial permeability -to values 60% or 100% higher than in the only furnace-cooled (FC) or water-quenched samples, respectively. However, the MI and PR results show that the FC sample is softer than the F&W sample at high frequencies.
IEEE Transactions on Magnetics, 2000
Fe 67 7 Nb 0 3 Cr 12 B 20 glassy melt-spun ribbons and glass-coated microwires with T C around 310-320 K ( 35-45 C) (the lowest ever reported for metallic glasses) have been prepared by rapid solidification. Excepting the thick melt-spun ribbons of 40 m, all samples have a glassy structure in the as-quenched state, consisting of very small Fe-Cr and boride (Fe 3 B) clusters of sizes ranging from several nanometer up to several tens of nanometer, embedded within the residual amorphous matrix. The ferromagnetic behavior of the glassy materials deteriorates drastically with an increase in the temperature. The melt-spun ribbons become paramagnetic above 34-35 C, whereas the transition temperature for the glass-coated microwires is around 45 C, because of the very specific magnetic domain structure and magnetic anisotropy distribution. The observed stable behavior of low C Fe 67 7 Nb 0 3 Cr 12 B 20 glassy alloys up to very high frequencies (10 GHz) is another important feature for sensing and biomedical applications. The temperature sensor based on low C Fe 67 7 Nb 0 3 Cr 12 B 20 glassy melt-spun ribbons has a very good sensitivity in a narrow temperature range (about 1 C).
Glass-forming ability and soft magnetic properties of Fe-Co-Nd-Nb-B amorphous alloys
2007
Due to their outstanding mechanical properties and soft magnetic characteristics, cobalt-based metallic glassy alloys have stimulated much interesting research. These metastable ferromagnetic materials possess very small magnetocrystalline anisotropy, and almost zero magnetostriction. They reveal low coercivity, extremely low core loss, moderate saturation polarization, and very high magnetism. Despite these attractive physical behaviors, Co-based metallic glasses are difficult to obtain by the melting/casting and conventional rapid solidification techniques due to their poor glass-forming ability. In the present study, we succeed in preparing (Co 75 Ti 25) 100−x Fe x (x; 0-20 at.%) metallic glassy powders, using a mechanical alloying approach. The end product of the as-prepared powders was consolidated into full dense cylinders with large-diameter and thickness (2 × 2 cm), using spark plasma sintering technique. The results have shown that the consolidation step did not lead to any undesired crystallizations or phase transformations, and the as-consolidated buttons maintained their unique short-range order structure. These bulk metallic glassy systems possessed high glass-transition and crystallization temperatures, suggesting their high thermal stability. However, they showed low values of the reduced glass-transition temperatures, indicating that this system is difficult to prepare by the conventional way of preparations.
IEEE Transactions on Magnetics, 1997
Results on the effect of Nln, Sn, and Cr additions on the magnetic properties o f positive magnetostrictive E'e79SisB16 amorphous glass-covered magnetic wires are presented. Magnetic measurements performed on Pe75Si~B16Mn4, Fe77Sidh6Sn~, and Fe77Si5B16Cr~ amorphous glass-covered wires show the existence o f a large Barkhausen effect in these wires, but the switching fields are smaller than those of the Fe79SisB16 ones. These additions also diminish the saturation magnetization o f PeSiB amorphous glass-covered wires. Measurements on samples after glass removal have been also performed. The results are interpreted by taking into account the reduction in the strength of the magnetoelastic coupling between internal stresses and magnetostriction due to the decrease o f the magnetostriction constant.
Formation and magnetic properties of Fe–Si–B–Dy amorphous alloy
Intermetallics, 2010
Multi-component alloy ribbons with compositions of (Fe 0.75 Si 0.10 B 0.15) 100Àx Dy x (X ¼ 0, 0.5, 1 and 2 at.%) are prepared by single roller melt-spinning method. The structure is fully amorphous as demonstrated by XRD investigation. When Dy addition is above 1 at.%, the glass transition temperature (T g) appears in DSC curves and has a large supercooled liquid range (DT x) up to 51 K. The amorphous alloy ribbons exhibit good soft magnetic properties with Curie temperature (T C) between 700 K and 653 K, high saturation magnetization (M S) between 1.58 and 1.50 T, and coercive force (H C) of 27.77e22.28 A/m. In this study, it is shown that as little as 2 at.% of Dy addition to FeeSieB alloys is very effective in improving glassforming ability and still maintains good soft magnetic properties.
Journal of Physics & Optics Sciences
The effect of various processing modes on the magnetic properties of amorphous Fe49Ni29Si9B13 and Fe59Ni19Si9 B13 alloys obtained by melt spinning was examined. Samples from both alloys were prepared separately in the magnetic field and without the field. An increase in soft magnetic properties was observed during the period of the transition to the crystalline phase, (Hc = 50 A/m, Br = 2.16 Tl). After crystalline phases are formed, materials lose their soft magnetic properties. The composition of samples of rapidly cooled various Fe and Ni containing alloys were tested on XRD. Shimadzu XRD 6000 diffractometer was used to determine the phases of amorphous alloys by applying Cu Ka radiation at 40 kV/30 mA (CuKa1 = 122.59 A/m). Kβ radiation is eliminated by graphite monochromator