Characterization and amorphous phase formation of mechanically alloyed Co60Fe5Ni5Ti25B5 powders

Avar, Barış; Özcan, Şadan

doi:10.1016/j.jallcom.2015.07.268

Cited by 35 publications

(8 citation statements)

References 23 publications

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“…Researchs [46][47][48] has shown that it can be observed that the milling process probably causes a severe deformation in the material with atomic disordering and transformation of the crystalline phases to amorphous phases, as seen in the XRD analysis, which results in a decrease of M s in the powders.…”

Section: Resultsmentioning

confidence: 99%

Influence of ball milling parameters on microstructure and magnetic properties of aluminum bronze chips reinforced with vanadium carbide

Dias

Silva

2021

Int J Adv Manuf Technol

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This article analyzes the influence of mechanical ball milling parameters on processed aluminum bronze chips in order to increase the efficiency of this process in terms of particles' size reduction. Also evaluated is the addition of vanadium carbide (VC) in this response, along with its microstructure and magnetic properties. The experiments have been carried out in accordance with DOE design methodology. After machined, its residues can still be reused to produce composites through powder metallurgy routes, preserving good mechanical properties without onus to the environment. The study aims to produce and characterize powders resulting from ball milling processes, identifying the influential parameters, in addition to verify its soft magnetization behavior. The powder morphologies and particle sizes underwent scanning electron microscopy (SEM), coupled with energy-dispersive spectroscopy (EDS) and laser diffraction particle analyses, respectively, in addition to phase identification via X-ray diffraction (XRD). Moreover, saturation magnetization (M s ), remanent magnetization (M r ), coercivity (H c ), and remanence-to-saturation ratio (M r /M s ) were determined through magnetic hysteresis curves obtained from a vibrating sample magnetometer (VSM). Results indicate that % VC and milling time are the main parameters to improve the milling efficiency and obtain submicrometric particles with sizes almost 800 times smaller than the initial chips. After the milling process, aluminum bronze powders presented certain amorphization, a decrease of about 24% in M s and an elevation about 81% in H c , both compared with the as cast material. The M r /M s ratio indicates a slight conservation of magnetization.

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Section: Resultsmentioning

confidence: 99%

Influence of ball milling parameters on microstructure and magnetic properties of aluminum bronze chips reinforced with vanadium carbide

Dias

Silva

2021

Int J Adv Manuf Technol

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“…Complementary magnetic behavior is given by the remanence (or remanent field) M r and the squareness ratio (M r /M s ). For mechanical alloying, the value of M r /M s is usually low, at between 0.01 and 0.1 [31]. A value close to 1 is suitable for magnetic storage systems.…”

Section: Resultsmentioning

confidence: 99%

Structural, Thermal and Magnetic Analysis of Fe75Co10Nb6B9 and Fe65Co20Nb6B9 Nanostructured Alloys

et al. 2021

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Two nanocrystalline ferromagnetic alloys of the Fe-Co-Nb-B system have been produced by mechanical alloying (MA). Their microstructure, thermal behavior and magnetic response were checked by X-ray diffraction (XRD), differential scanning calorimetry (DSC) and vibrating sample magnetometry (VSM). After 80 h of MA, the alloys were nanostructured (bcc-Fe(Co)-rich phase). As the Co content increases, the density of the dislocations decreases. Besides, a higher concentration of Co causes an increase in the activation energy of the crystallization process. The calculated energies, 267 and 332 kJ/mol, are associated to the crystalline growth of the bcc-Fe-rich phase. The Co content of the samples has no effect on the value of the saturation magnetization, whereas the coercivity is lower in the alloy containing less Co. Samples were compacted and heat-treated. Optimal annealing reduces the coercivity by a factor of two. Results were compared with the data of Fe-Nb-B and Fe-Ni-Nb-B alloys.

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“…After 100 h of milling, the particles become finer and more spherical (Figure 5h,i), signifying the completion of the solid-state amorphization. [17,18] Figure 7 shows the energy dispersive X-ray spectroscopy analysis (EDX) (attached to the SEM) elemental mapping of 120 h milled samples of Ni 70 Ti 10 B 20 . It revealed homogeneous and uniform distribution of Ni, Ti, and B in the alloy.…”

Section: Resultsmentioning

confidence: 99%

Solid‐State Synthesis and Characterization of the Stable Nanostructured Ni₂₁Ti₂B₆ Phase

Şimşek

Avar

Özcan

et al. 2021

Physica Status Solidi (b)

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The mechanochemical method of synthesizing nanomaterials is known for its simple alloying technique to produce quasicrystalline and amorphous alloy phases. [1] The most tangible benefit of this method is, it does not require any heat that may adversely cause physical and chemical changes in the materials. This makes it very suitable for the synthesis of many metal alloys and ceramic composites where the prevention of any undesirable heat-induced oxidation or degradation is necessary. By optimizing milling parameters like rotational speed, ball-to-powder ratio, milling media, milling time, and also in some cases, the addition of process controlling agents, a variety of materials can be synthesized utilizing this method. Mechanochemical or mechanical alloying (MA) method for synthesizing nanomaterials involves high-energy milling technique and is generally carried out under controlled atmosphere. The major drawbacks of this method, however, are: a) discrete nanoparticles in the finest size range are difficult to prepare, and b) risks of contaminating the product from the attrition of milling media. In this method, materials go through the process of fracturing, cold welding, flattening, and fragmenting. [2] Continuous fracturing and cold welding of the milling powders during the process leads to solid state reactions between the components to form ultrafine powders of alloyed materials. The particle size distributions can be controlled by changing the aforementioned milling parameters like rotation speed, milling time, etc., and eventually nanostructured powders can be achieved effectively. [3][4][5] The syntheses of Ni-Ti-B ternary alloys from their elemental stages are not very well studied for their alloyed phase compositions and related physicochemical and mechanical properties. MA is an alternative and cost-effective method for the synthesis of these alloys with respect to the other methods, such as melt and quench process. Reviewing various features of Ni-based alloys and realizing the growing interest for Ni-Ti alloys in the vast areas of aerospace engineering and biomedical

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Characterization and amorphous phase formation of mechanically alloyed Co60Fe5Ni5Ti25B5 powders

Cited by 35 publications

References 23 publications

Influence of ball milling parameters on microstructure and magnetic properties of aluminum bronze chips reinforced with vanadium carbide

Influence of ball milling parameters on microstructure and magnetic properties of aluminum bronze chips reinforced with vanadium carbide

Structural, Thermal and Magnetic Analysis of Fe75Co10Nb6B9 and Fe65Co20Nb6B9 Nanostructured Alloys

Solid‐State Synthesis and Characterization of the Stable Nanostructured Ni₂₁Ti₂B₆ Phase

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Characterization and amorphous phase formation of mechanically alloyed Co60Fe5Ni5Ti25B5 powders

Cited by 35 publications

References 23 publications

Influence of ball milling parameters on microstructure and magnetic properties of aluminum bronze chips reinforced with vanadium carbide

Influence of ball milling parameters on microstructure and magnetic properties of aluminum bronze chips reinforced with vanadium carbide

Structural, Thermal and Magnetic Analysis of Fe75Co10Nb6B9 and Fe65Co20Nb6B9 Nanostructured Alloys

Solid‐State Synthesis and Characterization of the Stable Nanostructured Ni21Ti2B6 Phase

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Solid‐State Synthesis and Characterization of the Stable Nanostructured Ni₂₁Ti₂B₆ Phase