Effect Of Cobalt Addition Research Articles

Effect of cobalt addition on thermal cycling behaviour of Ti50Ni(50−x)cox shape memory alloys

The effect of adding Co on the temperature cycling behaviour of ternary Ti50Ni(50−x)Cox (x = 1, 2, 3) alloys was experimentally studied in this work. The alloys were prepared using a vacuum induction furnace, followed by subjecting them to homogenization, hot-rolling and annealing processes. The alloys were subjected to thermal cycling experiments in a nitrogen atmosphere by differential scanning calorimetry under stress-free conditions between their transformation temperatures. The results indicate that adding Co to NiTi alloys decreases their transition temperatures, improves the thermal cycling stability apart from suppressing the R-phase formation on cooling during cycling. The changes are due to the addition of Co introducing solid solution strengthening and generation of dislocations during cyclic phase transformations, as confirmed by the hardness test results and TEM micrographs, respectively.

Effect of cobalt addition on structural, optical, morphological and magnetic properties of NiO nanoparticles prepared by chemical precipitation method

The modification in the microstructural, functional group, optical, morphological and magnetic properties of pure and different concentrations (0.01 M to 0.04 M) of cobalt doped NiO nanoparticles synthesized by chemical precipitation method is examined using X-ray diffraction (XRD), Fourier Transform Infrared (FTIR) spectroscopy, UV–Vis absorption spectroscopy (UV–Vis), Photoluminescence (PL), Scanning Electron Microscopy (SEM), and Energy dispersive X-ray spectroscopy (EDX), Transmission Electron Microscopy (TEM), High-Resolution Transmission Electron Microscopy (HR-TEM), Selected Area Electron Diffraction pattern (SAED) and vibrating sample magnetometer (VSM). The average grain size of pure NiO and cobalt doped NiO nanoparticles are 16.37 nm, 18.36 nm, 21.42 nm, 16.83 nm and 18.36 nm respectively. The UV absorbance study shows a strong absorption peak in ultraviolet visible region. The band gap values of pure NiO and cobalt doped NiO nanoparticles are 2.32 eV, 3.14 eV, 3.08 eV, 3.03 eV and 3.06 eV respectively. The incorporation of cobalt into NiO nanoparticles have strongly influenced the magnetic behaviour and the material got converted from weak ferromagnetic into ferromagnetic material.

Effect of cobalt addition on wear behaviour of TiB2 coating produced by TIG cladding process

In this paper, the mechanical and tribological characteristics of TiB2 ceramic coating with and without cobalt (Co) addition developed using tungsten inert gas (TIG) cladding process on AISI 304 stainless steel (SS) were investigated. The effect of TIG process conditions as well as cobalt (Co) content on the microstructure, microhardness and resistance to wear were investigated systematically. The phase identification, microstructure, and elemental distribution map of the clad layer formed on the surface of an AISI 304SS substrate were characterized by x-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS), respectively. Vickers microhardness testing apparatus and a pin-on-disc tribometer were used to evaluate the microhardness, resistance to wear, and coefficient of friction (COF), respectively. The result demonstrates that a dense and defect-free composite coating with a strong metallurgical bond to the substrate is possible. The average microhardness of the TiB2 ceramic coating without Co addition was 1704 HV, and the average wear rate was 15.1576 × 10−9 g N−1-m−1. In contrast, the TiB2 ceramic coating with Co addition exhibited an improved average microhardness of 1860 HV and a reduced average wear rate of 22.7364 × 10−9 g N−1-m−1, while the AISI 304SS substrate had an average microhardness of 216 HV and an average wear rate of 200.45×10−9 g N−1-m−1. The conclusion is that the TiB2 ceramic coating with Co addition exhibited superior mechanical and tribological characteristics, demonstrating its suitability for use in wear-resistant components. The higher microhardness of the TiB2 ceramic with Co-added coating indicates enhanced hardness and potential resistance to deformation, while the lower wear rate suggests improved durability and the ability to withstand frictional forces. Therefore, the TiB2 ceramic coating with Co addition shows promise for applications where wear resistance is crucial.

Effect of Cobalt Addition on the Evolution of Austenite and ε-Martensitic Transformation during Loading of 201 Stainless Steel

Effect of Cobalt Addition on the Evolution of Austenite and ε-Martensitic Transformation during Loading of 201 Stainless Steel

Effects of Cobalt Addition on the Precipitation Evolution and Tensile/creep Behavior of Fe-15Cr-25Ni-2.5Al-NbWCu Alumina-forming Austenitic Steel at 700°C

The effects of Co on the precipitation evolution and tensile/creep properties of the alumina-forming austenitic (AFA) stainless steel at 700°C were systematically investigated. Two investigated steels based on the Fe-15Cr-25Ni-2.5Al (in mass%) AFA steel were prepared; one is added 2.5 mass% W sorely, and the other is added 2.5 mass% W and 5 mass% Co together. After aging treatment, secondary NbC was precipitated in both steels and dispersed within the matrix. However, after adding Co to AFA steels, nanoscale L12 Ni–Al–Cu phase was not observed, and the amount of Laves and the δ-ferrite phase decreased with the same aging time, indicating that addition of Co improved microstructure stability. The tensile strength of AFA specimens with added Co did not significantly decrease, especially with a long-term aging treatment, compared to samples without added Co. However, introducing Co greatly improved the toughness of AFA steels. Also, the results of the creep fracture tests show that adding Co improved the creep life of AFA steels. The reason for this enhancement is that the formation of detrimental secondary phases at the grain boundary was greatly suppressed, after adding Co to AFA steels.

Effect of Cobalt Additions on the Microstructure and Properties of Sodium Bismuth Titanate Ceramics

Single-phase (Na0.5Bi0.5)(Ti1 – xCox)O3 (x = 0–0.1, ∆х = 0.02) ceramic samples have been prepared by solid-state reactions, and their structure, microstructure, and dielectric properties have been studied. In all of the synthesized samples, a perovskite phase with a pseudocubic unit cell has been identified. Partial substitutions of cobalt cations for titanium cations increase the unit cell volume of the samples. We have studied the dielectric properties of the ceramics. The increased room temperature dielectric permittivity of the samples can be interpreted as evidence that the acceptor doping performed in this study has an advantageous effect on the piezoelectric properties of the sodium bismuth titanate ceramics.

Effect of Cobalt Addition on the Cytotoxicity and Cell Attachment of Titanium Alloys

Various types of titanium base alloys are utilized as implant materials and as minis crews in orthodontics. The purpose of the current study is to enhancing titanium-based alloys with the additions of Cobalt in different percentage (5%, 10%, and 15%) to enhance primary osteoblast attachment and implant tissue incorporation. the reaction between human MG63 osteoblast-like cells and titanium – cobalt alloy face is substantial in biomaterials and tissue engineering field. The major target was to estimate the proteomic response of MG63 osteoblast-like cells in various cobalt percentages. The samples with and without cobalt addition was produced by using powder technology in order to get an acceptable initial surface roughness. Also sample characterizations includes (scanning electron microscopy (SEM), X-ray diffraction (XRD), vitro test (Biocompatibility MTT assay with MG-63 Cells). Results obtained from XRD and microstructure observations, sample without cobalt addition refer to an alloy with single I± phase, while after the additions of cobalt in different percentage (5%, 10%, 15%) the samples consist of two I±-Ti and intermetallic compound Ti2Co and the amount of Ti2Co phase slightly increase with increasing cobalt content. From MTT assays Proliferation and cells attachment of MG63 were cultured after 2 days Cells grown for the pure titanium alloys possess finer and circular confines compared with the grown cells at (titanium – cobalt) alloys with all cobalt percentages. Rising cobalt percentage makes the MG63 cell sharper and enlarges which means cobalt aid to enhancing both cell proliferation and growth. Cytotoxicity Cell Viability results was kept, exhibition no kind of attack caused by titanium or cobalt materials, The feature, of cobalt additions, in contrast to commercial pure titanium alloys, is the presence of active and non- cytotoxic compound (Ti2Co) which presents several attractive features, make the surface more attractive to the bone . How to Cite this Article Pubmed Style Fatimah J. Al-Hasani. of Cobalt Addition on the Cytotoxicity and Cell Attachment of Titanium Alloys. SRP. 2020; 11(5): 804-813. doi:10.31838/srp.2020.5.119 Web Style Fatimah J. Al-Hasani. of Cobalt Addition on the Cytotoxicity and Cell Attachment of Titanium Alloys. http://www.sysrevpharm.org/?mno=131488 [Access: March 30, 2021]. doi:10.31838/srp.2020.5.119 AMA (American Medical Association) Style Fatimah J. Al-Hasani. of Cobalt Addition on the Cytotoxicity and Cell Attachment of Titanium Alloys. SRP. 2020; 11(5): 804-813. doi:10.31838/srp.2020.5.119 Vancouver/ICMJE Style Fatimah J. Al-Hasani. of Cobalt Addition on the Cytotoxicity and Cell Attachment of Titanium Alloys. SRP. (2020), [cited March 30, 2021]; 11(5): 804-813. doi:10.31838/srp.2020.5.119 Harvard Style Fatimah J. Al-Hasani (2020) of Cobalt Addition on the Cytotoxicity and Cell Attachment of Titanium Alloys. SRP, 11 (5), 804-813. doi:10.31838/srp.2020.5.119 Turabian Style Fatimah J. Al-Hasani. 2020. of Cobalt Addition on the Cytotoxicity and Cell Attachment of Titanium Reviews in Pharmacy, 11 (5), 804-813. doi:10.31838/srp.2020.5.119 Chicago Style Fatimah J. Al-Hasani. Effect of Cobalt Addition on the Cytotoxicity and Cell Attachment of Titanium Alloys. Systematic Reviews in Pharmacy 11 (2020), 804-813. doi:10.31838/srp.2020.5.119 MLA (The Modern Language Association) Style Fatimah J. Al-Hasani. Effect of Cobalt Addition on the Cytotoxicity and Cell Attachment of Titanium Alloys. Systematic Reviews in Pharmacy 11.5 (2020), 804-813. Print. doi:10.31838/srp.2020.5.119 APA (American Psychological Association) Style Fatimah J. Al-Hasani (2020) of Cobalt Addition on the Cytotoxicity and Cell Attachment of Titanium Reviews in Pharmacy, 11 (5), 804-813. doi:10.31838/srp.2020.5.119

Phase transformation temperatures and physical characteristics of NiTiCo shape memory alloys produced by arc melting method

The effect of cobalt addition with different proportions into Ni50−xTi50Cox $$ x = 2, 4, $$ and 6 wt%) shape memory alloys was investigated. The alloys were produced by arc melting method and then some characteristics, including microstructure, phase transformation temperatures, and magnetic properties, were analyzed. Additionally, the determination of the crystal structure on the alloy’s microstructural phases, changes in chemical composition proportions, phase transformation temperatures, and magnetization were investigated at room temperature using XRD, SEM–EDX, DSC, and PPMS, respectively. As a consequence of these measurements, the absorbed and released energies and transformation temperatures exhibit an obvious decrease with the increase of Co addition into the alloys. The microhardness results revealed that the second phase of the alloys has higher hardness compared to the matrix phase. Moreover, with the increase of Co addition into the alloy, Gibbs free energy showed a regular increase while elastic energy exhibited irregular changes. The increase of Co addition to the alloys increased the magnetization property of the alloys.

Effect of Cobalt Additions on the Microstructure and Mechanical Properties of As-Cast Thin-Wall Ductile Iron

The production of thin-wall ductile iron can be challenging due to the formation of carbides during the solidification process. One way to reduce carbides in thin sections is by the addition of silicon, but this is detrimental for the impact strength and fracture toughness of ductile iron. It is known that cobalt as an alloying element in ductile iron increases the nodule count resulting in a larger fraction of ferrite. Therefore, the ability of cobalt to inhibit carbide formation was studied. The goal was to inhibit carbide formation without increasing silicon content. Five heats were produced: Co-free ductile iron, 1 wt%, 2 wt%, 3 wt%, and 4 wt% Co. These were cast into plates with thicknesses of 2, 2.5, 3, 3.5, 4, and 6 mm. Metallography was performed to evaluate the percent nodularity, nodule count (N/mm2), and ferrite/pearlite/carbide percentages. Tensile testing was performed using flat sub-size dogbone samples. Also, the fracture surfaces of the 2 and 6 mm sections were analyzed using SEM. Finally, Brinell hardness was performed on each section thickness. There was no increase in the percent nodularity with the addition of cobalt, but with 4 wt% Co an increase in nodule count was observed. With the addition of 3 wt% and 4 wt% Co, there was a reduction in carbide percentage due to an increase in ferrite content. With the addition of 4 wt% Co, there is a reduction in yield strength and an increase in elongation due to a higher ferrite percentage. It was discovered that with the addition of 4 wt% Co the production of carbide-free sections is possible without increasing the silicon percentage above 2.41 wt% Si.

Effect of cobalt addition on platinum supported on multi-walled carbon nanotubes for water-gas shift

A series of cobalt-promoted Pt catalysts supported on multi-walled carbon nanotubes was synthesized, and their performance was evaluated for the water-gas shift (WGS) reaction. Compared to the monometallic Pt catalyst, the WGS turnover rate (TOR) at 300 °C was promoted by a factor of 10 at a Pt:Co molar ratio of 1:3. X-ray absorption spectroscopy and XRD showed the presence of a Pt3Co alloy along with a partially oxidized cobalt and a free cobalt metal phase after reduction pretreatment. In order to determine the dominant active site over the Co-promoted catalysts, selective leaching of partially oxidized Co (designated as CoOxHy) and Co metal was performed with a 5% wt. acetic acid solution, while preserving the Pt-rich phases. The WGS TOR at 300 °C for the Co-promoted catalysts after leaching was observed to be even lower than that of the monometallic Pt catalyst. Thus, the alloy formation was determined to be inconsequential towards promotion in the WGS TOR, while the dominant active site was determined to be a PtCo alloy in intimate contact with the CoOxHy phase. Combined Density Functional Theory (DFT) calculations and ab-initio thermodynamic phase diagrams point to a monolayer of CoOH being the most stable Co phase on Pt(111) under WGS conditions. Calculations of OH binding energies on Pt(111), Pt3Co(111), and at the interface between CoOH overlayers and Pt(111) show that trends in the WGS activity of these catalysts are linked to the strength of OH binding, with the strongest OH binding found at the interface between CoOH and Pt, supporting the conclusion that a similar interface is the source of enhanced WGS activity in the PtCo bimetallic system.

Martensitic transformation, crystal structure and shape memory effect in Ni55−xMn25Ga20Cox alloys

ABSTRACTThe effect of cobalt addition instead of nickel on the crystal structure, martensitic transformation behaviour and shape memory effect were investigated. Within the analysed range of chemical composition, a single non-modulated martensite was detected at ambient temperature. Cobalt addition modified the lattice parameters and, thus, affected the tetragonality of the martensite unit cell. The hysteresis of martensitic transformation was differently affected by the type of heat treatment applied. For furnace cooled samples, the hysteresis decreased from 50°C to 30°C; in the case of water quenched samples, the hysteresis sharply increased up to 60°C. The shape memory effect, measured as the recoverable strain upon annealing after compression tests, reached a fully recoverable deformation at 10 at.-% of cobalt.This paper is part of a Thematic Issue on The Crystallographic Aspects of Metallic Alloys.

Effect of cobalt addition on the morphology and mechanical properties of W–Ni–Cu–Co alloy

This paper investigates the performance of a tungsten (W)–nickel (Ni)–copper (Cu) heavy alloy with 0·5, 1·0, 1·5 and 2·0 wt% cobalt (Co) additions. The alloys are prepared through spark plasma sintering at a sintering temperature of 1400°C following a heating step of 100°C/min. The alloy with 0·5 wt% cobalt is observed to have good mechanical properties in comparison with other alloys. The density and hardness of the alloys follow a decreasing trend with an increase in cobalt addition. Subsequently, microstructural characteristics, such as contiguity, average grain size and matrix volume fraction, are measured and investigated, as they are found to affect the mechanical properties of the alloys. The average grain growth of the alloys varies around 13 µm. As the cobalt percentage is increased, tungsten–tungsten contiguity is observed to increase. The W–Ni–Cu–0·5Co alloy exhibits higher yield and tensile strength in comparison with other heavy tungsten alloys. The fracture surface analysis shows a predominantly tungsten grain cleavage fracture for 0·5 wt% cobalt alloy. The other alloys show more features of matrix interface failure and tungsten decohesion.

Effect of cobalt addition on the microstructural evolution, thermal stability and magnetic properties of Fe-based amorphous alloys

The role of cobalt and its influence on the structure, and thermal and magnetic performance of a (Fe1-xCox)77Si8B10P5 system with x = 0, 0.2 and 0.4 was investigated. It was possible to obtain amorphous alloys throughout the system by the melt spinning technique. Therefore, it can be stated that certain amounts of Co do not affect glass forming ability, allowing Fe-based alloys to be obtained with amorphous structure. 19% enhancement of the Curie temperature was observed with Co addition, indicating an increase in magnetic stability at high temperatures; while saturation magnetization presented a slight reduction. Crystallization mode changed from one to two exothermic peaks, and the phases found in the system corresponded to α-Fe(Si), Fe2B and Fe3(B, P) for the Co-free alloy, and α-Fe(Co)Si, Fe3(B, P), Co2Si, Co2B, Fe3P, and FeB for the Co-containing alloys.

Hot deformation behavior and microstructural evolution of as-cast Co-containing maraging stainless steels

A new type of maraging stainless steel (MSS) was developed by cobalt alloying technology to improve the strength and ductility of maraging precipitation hardening stainless steel. However, the effect of cobalt addition on the hot deformation behavior and the mechanism of microstructural evolution are still unclear. In this paper, therefore, hot uniaxial compression tests of two as-cast Co-free and Co-containing MSSs were carried out at temperatures of 950 °C–1150 °C and strain rates of 0.01–10 s−1. A comparative study on hot deformation behaviors of Co-free and Co-containing steels had been conducted. The constitutive relations of flow stress, temperature and strain rate were established respectively, and the average deformation activation energy of the two steels under the present deformation region was identified (Co-free: 458.371 ± 27 kJ mol−1 and Co-containing: 379.024 ± 11 kJ mol−1). The processing maps for the two steels based on dynamic material model were generated to reveal the correlation between microstructural evolution and processing parameters. The regions of deformation stability and instability of the two steels were characterized respectively. In most working conditions, the power consumption of Co-containing steel was higher than that of Co-free steel. The dynamic recrystallization occurred in both steels under most conditions. The addition of cobalt promoted the dynamic recrystallization during hot deformation due to the reduction of the stacking fault energy of the matrix and to the suppression of dislocation climb and cross-slip.

Microstructure and Properties of Fe80–xCoxZr10–yNbyB10 Alloys

Transformations under heating, microstructure, and magnetic properties of alloys Fe80–xCoxZr10–yNbyB10 (x = 0, 40; y = 2, 4, 6) obtained by melt spinning are studied by differential thermal analysis, x-ray diffractometry, scanning electron microscopy and vibration magnetometry. The effect of cobalt additions on the toughness and the coercivity of the alloys is described.

Effect of cobalt addition on the structure and properties of Ni-MCM-41 for the partial oxidation of methane to syngas.

A one-step hydrothermal crystallization method was used to synthesize Co–Ni–MCM-41 catalysts for the partial oxidation of methane to syngas reaction. Co was added as an assistant in the synthesis process. The formation of a Ni–Co alloy decreased the damage of Ni ions to the framework of MCM-41. The Ni–Co alloy introduced more Ni into the channel exposing more active sites. The properties of the synthesized catalysts were characterized by XRD, N2 adsorption–desorption, TEM, ICP, FT-IR, H2-TPR, XPS and TGA techniques. Co–Ni–MCM-41 catalysts showed superior catalytic performance and sintering resistance than Ni–MCM-41 catalyst without Co. The Ni–Co alloy inhibited the formation of the NiO, thus reducing the sintering of the catalyst. The result was attributed to higher metal dispersion and more regular pore structure of the Co–Ni–MCM-41 catalysts. When the Co content was 1%, a conversion of 88% and selectivity of 87% was achieved.

Effect Of cobalt addition on Fe-20Cr-5Al-1Y2O3 ODS alloy fabricated by arc plasma sintering (APS) process

In this research, microstructure, phases and hardness of Fe-Cr-Al based Oxide Dispersion Strengthened (ODS) alloy with addition of cobalt (Co) produced using arc plasma sintering (APS) method were investigated. ODS alloy has an important role particularly in high temperature applications, since it has the ability to maintain their strength at high service temperature. On the other hand Co is well known to increase creep resistance of many alloys, which could in turn increases their lifetime in high temperature environment. To produce ODS alloy, usually high cost and long processing time are required. To overcome these problems, a new sintering method based on arc plasma was used in this study, which has been successfully applied in previous works. The alloys composed of Fe-20Cr-5Al-1Y2O3 with addition of 0.5, 1, 1.5 and 2 wt% cobalt were first prepared by mechanical alloying (MA) comprising high-energy milling for 8 hours and subsequent isostatic pressing at 20 ton-force/in2 prior to sintering by APS method up to 28 minutes. The sintered samples then characterized by means of Scanning Electron Microscopy (SEM) equipped with an Energy Dispersive X-Ray Spectrometer (EDX) to observe the microstructure, the X-Ray Diffraction Technique (XRD) to investigate the formed phases, and Vickers microhardness test to examine hardness value of the alloys. The results show that APS method is technically and economically feasible for fabricating ODS alloys since this process significantly reduces time and energy required. Variation of cobalt in the alloy obviously does not cause observable microstructure difference. However, the alloy with 0.5 wt% cobalt exhibited single FeCrAl matrix phase, while at higher cobalt concentration additional AlCo phases were found in the FeCrAl matrix, which can be assumed to improve the high temperature usage of the alloy. Cobalt addition also increased hardness value of these alloys.

Microstructure and Corrosion Behavior of Laser Synthesized Cobalt Based Powder on Ti-6Al-4V

The corrosion behavior of titanium alloys when used for various dynamic offshore components has been a major concern of titanium drilling risers in deepwater energy extraction. A way of achieving specified requirement is the development of coatings suitable to protect the base material against corrosion. In this work, laser cladding technique which is known as a leading edge due to its distinctive properties and outcomes was used in synthesizing Co-based powder on titanium alloy. The processing parameters used were laser power of 900W; scan speed of 0.6 to 1.2 m/min; powderfeedrate1.0g/min;beamspotsize3mm;gasflowrate1.2L/min.The effects of cobalt addition and laser parameters on corrosion behavior of laser clad Ti6AL4V coating in 0.5M sulfuric medium were investigated using linear potentiodynamic polarization. The changes in microstructure and corrosion behavior were analyzed using scanning electron microscopy (SEM) while the X –ray diffraction (XRD) indicates the intermetallics in the coatings. Results showed that the coatings displayed good metallurgical bonding with dendritic formations between the coatings and the substrate. The anodic current density increased with lower scan speed. However, the corrosion current densities of laser-clad samples were lower than Ti6Al4V alloy.

Effect of cobalt addition on the corrosion behavior of near equiatomic NiTi shape memory alloy in normal saline solution: electrochemical and XPS studies.

The electrochemical and corrosion (uniform and localized) behavior of a binary Ni52Ti48 shape memory alloy (SMA) and two ternary Ni52Ti48−xCox (x = 1.5 and 4.0 wt%) SMAs were studied. Measurements were conducted in 0.9% NaCl solution at 37 °C employing various electrochemical methods. These include: linear polarization resistance (LPR), linear sweep voltammetry (LSV), chronoamperometry and dynamic electrochemical impedance spectroscopy (DEIS). Such measurements were complemented with scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) analysis. Results revealed that the addition of alloyed Co to NiTi significantly reduced the uniform corrosion rate of the studied SMA and greatly enhanced its pitting corrosion resistance. XPS measurements evidenced high stability of the passive layer and limited adsorption of chloride ions. Additionally, it was found that the passive layer remained primarily composed of titanium oxides. Microstructure changes accompanying the addition of Co were also used to account for its role in improving the corrosion resistance of these materials.

Effects of cobalt addition on microstructure and magnetic properties of PrNdFeB/Fe7Co3 nanocomposite

The permanent magnetic nanocomposite PrNdFeB/Fe7Co3 ribbons were prepared by directly quenching, and the microstructure and magnetic influence of composite materials with Co substitution were studied. The phase identification and the magnetic properties were measured by X-ray diffraction (XRD) and vibrating sample magnetometry (VSM). Microstructure observation was performed using scanning electron microscopy (SEM). The crystallization temperatures of the hard magnetic phase and the soft magnetic phase were measured using differential scanning calorimetry (DSC). The experimental results showed that Co addition improved the Curie temperature of magnets. When the ribbons were melt-spun at 35 m/s, the added content of Co was 4 at.%, and the magnetic properties were the best, which were remanence (Br) of 0.379 T, coercivity (Hci) of 344.4 kA/m, the maximum magnetic energy product (BH)max of 32.6 kJ/m3. Besides, the activation energy of each phase was calculated by Kissinger equation, which was 310.4 kJ/mol of Fe7Co3 phase and 510.2 kJ/mol of 2:14:1 phase, respectively.