A comparative study of the Fe-based amorphous alloy prepared by mechanical alloying and rapid quenching

Neamţu, B.V.; Chicinaş, H.F.; Ababei, G.; Gabor, M. S.; Marinca, Traian Florin; Lupu, N.; Chicinaş, Ionel

doi:10.1016/j.jallcom.2017.01.359

Cited by 19 publications

(5 citation statements)

References 33 publications

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“…We expected to detect a diminution in the magnetisation of saturation as the Fe/B ratio decreased. Likewise, it is known that the magnetic properties depend strongly on the microstructure evolution, crystalline size, internal stress, particle shape anisotropy, magnetic anisotropy, and magnetostriction of the materials [48]. In our work, higher B content decreases crystalline size and this effect counteracts, partially (favouring soft behaviour), the effect of the reduction of the magnetic element, Fe.…”

Section: Thermomagnetic Analysissupporting

confidence: 56%

Two Fe-Zr-B-Cu Nanocrystalline Magnetic Alloys Produced by Mechanical Alloying Technique

et al. 2023

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Fe-rich soft magnetic alloys are candidates for applications as magnetic sensors and actuators. Spring magnets can be obtained when these alloys are added to hard magnetic compounds. In this work, two nanocrystalline Fe-Zr-B-Cu alloys are produced by mechanical alloying, MA. The increase in boron content favours the reduction of the crystalline size. Thermal analysis (by differential scanning calorimetry) shows that, in the temperature range compressed between 450 and 650 K, wide exothermic processes take place, which are associated with the relaxation of the tensions of the alloys produced by MA. At high temperatures, a main crystallisation peak is found. A Kissinger and an isoconversional method were used to determine the apparent activation of the exothermic processes. The values are compared with those found in the scientific literature. Likewise, adapted thermogravimetry allowed for the determination of the Curie temperature. The functional response has been analysed by hysteresis loop cycles. According to the composition, the decrease of the Fe/B ratio diminishes the soft magnetic behaviour.

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Section: Thermomagnetic Analysissupporting

confidence: 56%

Two Fe-Zr-B-Cu Nanocrystalline Magnetic Alloys Produced by Mechanical Alloying Technique

et al. 2023

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“…When compared to the Tb-free alloy [15,16], Tb addition promotes the formation of amorphous phases. Amorphous alloys devoid of atomic long range order and crystalline defects are characterized by excellent soft magnetic properties [17]. Table 1, which summarizes relevant magnetic data, reveals that the coercivities (H ci ) and the remanence ratios (J r /J s ) of the alloys are very low; the maximum value of H ci is only 26.3 kA m −1 , which confirms the soft magnetic nature of these amorphous alloys.…”

Section: Methodsmentioning

confidence: 72%

The effect of Tb doping on the magnetic properties and microstructure of a TbNdFeCoB/Fe₇Co₃ nanocomposite permanent magnet

Ding

Cui

Yang

et al. 2020

Mater. Res. Express

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Melt-spun NdFeB-type nanocomposite magnetic materials are important in a number of applications, including electromagnetic sensors, magnetic resonance imaging, and voice coil motors. Herein we investigated the magnetic properties and microstructures of melt-spun Tb x Nd 10−x Fe 80 Co 4 B 6 /Fe 7 Co 3 (x=0.1, 0.2, and 0.3) ribbons by means of x-ray diffractometry, scanning electron microscopy, and magnetization experiments. Tb doping resulted in the formation of a 2:14:1 phase with a higher anisotropy field, which suppressed the separation of Fe 7 Co 3 branch crystals and improved the magnetic properties of the material. Optimum magnetic properties that include a remanence (J r ) of 0.62 T, a coercivity (H ci ) of 612.0 kA m −1 , and a maximum magnetic energy product ((BH) max ) of 94.9 kJ m −3 were obtained for the annealed Tb 0.3 Nd 9.7 Fe 80 Co 4 B 6 /Fe 7 Co 3 ribbon. Furthermore, the effective anisotropy constant, K , eff and the saturation magnetization, Ms, in the nanocomposite were determined by the LATS (law of approach to saturation) method. In this study, the values of K eff and Ms were found to lie between those of hard and soft magnetic phases, consistent with the exchangecoupling concept.

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“…The as melt-spun ribbons presented a high saturation magnetization (Ms) of ~171 emu/g and a low coercivity (Hc) of ~2.8 Oe. In the 20 hrs milled ribbons a reduction in Ms (~161 emu/g) and an increase in Hc (~38 Oe) was observed; these could be due to internal stresses, induced structural defects, partial destruction of magnetic anisotropy and a larger amount of free volume content produced by milling process [22].…”

Section: Resultsmentioning

confidence: 96%

Magnetic and Thermal Studies of Iron-Based Amorphous Alloys Produced by a Combination of Melt-Spinning and Ball Milling

Razzaghi

Kianvash

Tutunchi

2021

AMR

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In this study, we demonstrate the synthesis of an Fe78Si9B10P3 amorphous alloy by three pathways: mechanical alloying, melt-spinning and a combination of melt-spinning and ball milling. Microstructure, thermal stability and soft magnetic properties of the melt-spun and mechanically alloyed powders are comparatively studied. Ball milling of previously melt-spun samples led to an amorphous powder with an average particle size of ~2.4 μm after 20 hrs of milling. Mechanical alloying of elemental Fe-Si-B-P powders in a planetary ball mill for up to 100 hrs led only to a partial amorphisation of powder with a median particle size of ~1.3 μm. Differential thermal analysis of the amorphous ribbon revealed that the amorphous phase was stable up to ~520 °C, at which the crystallization process occurred. The melt spun ribbons exhibited excellent soft ferromagnetic behavior, including high saturation magnetization (Ms) of ~171 emu/g and a low coercivity (Hc) of ~2.8 Oe. In the 20 hrs milled ribbons, due to a probable partial anisotropy which induced by ball milling stress, the Ms value decreased slightly to ~161 emu/g but the Hc increased to ~38 Oe. The mechanically alloyed samples present a relatively lower Ms of ~154 emu/g and higher Hc of ~43 Oe. It is to be noted that the milling of ribbons is usually inevitable due to their technological restrictions in use.

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A comparative study of the Fe-based amorphous alloy prepared by mechanical alloying and rapid quenching

Cited by 19 publications

References 33 publications

Two Fe-Zr-B-Cu Nanocrystalline Magnetic Alloys Produced by Mechanical Alloying Technique

Two Fe-Zr-B-Cu Nanocrystalline Magnetic Alloys Produced by Mechanical Alloying Technique

The effect of Tb doping on the magnetic properties and microstructure of a TbNdFeCoB/Fe₇Co₃ nanocomposite permanent magnet

Magnetic and Thermal Studies of Iron-Based Amorphous Alloys Produced by a Combination of Melt-Spinning and Ball Milling

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A comparative study of the Fe-based amorphous alloy prepared by mechanical alloying and rapid quenching

Cited by 19 publications

References 33 publications

Two Fe-Zr-B-Cu Nanocrystalline Magnetic Alloys Produced by Mechanical Alloying Technique

Two Fe-Zr-B-Cu Nanocrystalline Magnetic Alloys Produced by Mechanical Alloying Technique

The effect of Tb doping on the magnetic properties and microstructure of a TbNdFeCoB/Fe7Co3 nanocomposite permanent magnet

Magnetic and Thermal Studies of Iron-Based Amorphous Alloys Produced by a Combination of Melt-Spinning and Ball Milling

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The effect of Tb doping on the magnetic properties and microstructure of a TbNdFeCoB/Fe₇Co₃ nanocomposite permanent magnet