Thermal stability and crystallization process in a Fe-based bulk amorphous alloy: The kinetic analysis

Rezaei-Shahreza, P.; Seifoddini, Amir; Hasani, Saeed

doi:10.1016/j.jnoncrysol.2017.05.044

Cited by 43 publications

(8 citation statements)

References 56 publications

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“…Thermal analysis such as TG and DTA is recognized as one of the best methods to gain the thermal characteristics, mechanism and kinetic analysis of various transformations of materials. The simultaneous TG‐DTA curves of the stoichiometric metal nitrates without agarose and stoichiometric metal nitrates with 2.5 g agarose are presented in Figure A,B, respectively.…”

Section: Resultsmentioning

confidence: 99%

The effect of agarose content on the morphology, phase evolution, and magnetic properties of CoFe₂O₄ nanoparticles prepared by sol‐gel autocombustion method

Rouhani

Esmaeil‐Khanian

Davar

et al. 2017

Int J Applied Ceramic Tech

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Hard‐magnetic CoFe2O4 nanoparticles were produced with the sol‐gel autocombustion route using agarose and citric acid as a neutral organic gel and combustion agent. For this purpose, the obtained gel is annealed at 800°C for 3 hours and then the spinel structure of the samples was confirmed by X‐ray diffraction (XRD). In addition, the existence of metal‐oxygen complexes in the gel and nanoparticles was investigated by Fourier transformation infrared (FTIR) spectra. Furthermore, FESEM images showed that semispherical and rod‐like particles were obtained by variation in agarose contents. For the rod‐like sample with 2.5 g agarose, the saturation magnetization and coercivity were measured equal to 71.7 emu/g and 10076.84 Oe, respectively.

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Section: Resultsmentioning

confidence: 99%

The effect of agarose content on the morphology, phase evolution, and magnetic properties of CoFe₂O₄ nanoparticles prepared by sol‐gel autocombustion method

Rouhani

Esmaeil‐Khanian

Davar

et al. 2017

Int J Applied Ceramic Tech

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“…For instance, in BMGs with a maximum nucleation and the minimum growth rates, crystallization process can take place partially by controlling the kinetic parameters and as a result an amorphous matrix nanocomposite can be produced with excellent mechanical and magnetic properties [ 27 , 28 , 29 ]. On the other hand, the presence of alloying elements can strongly control the size of crystalline particles during annealing process [ 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 ]. For instance, Lesz et al [ 32 ] studied the effect of Ni addition on the thermal properties of a Fe-based amorphous alloy.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, Fe 41 Co 7 Cr 15 Mo 14 Y 2 C 15 B 6 (at.%) BMG has been introduced with a high GFA (super-cooled liquid region; (Δ T x = 94 K)), high hardness (1368.4 H V ), and good strength (2217 MPa). In addition, the minor addition of copper improved the properties of this BMG due to the change of its thermal stability [ 7 , 17 , 37 ]. Although, the triple kinetic parameters of the crystallization process including the activation energy ( E ), pre-exponential factor ( A ) and reaction model ( f ( α )) were determined [ 38 ], no comprehensive investigation has been done into the isokinetic analysis of crystallization process of this BMG to determine more kinetic parameters and, therefore, there exists a knowledge gap.…”

Section: Introductionmentioning

confidence: 99%

Isokinetic Analysis of Fe41Co7Cr15Mo14Y2C15B6 Bulk Metallic Glass: Effect of Minor Copper Addition

et al. 2020

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In the present study, (Fe41Co7Cr15Mo14Y2C15B6)100−xCux (x = 0, 0.25 and 0.5 at.%) amorphous alloys were prepared by copper-mold casting. To clarify the effect of the minor addition of copper on the mechanism of nucleation and growth during the crystallization process, an isokinetic analysis was performed. The activation energies (E) of the various crystallization stages were calculated by using theoretical models including Kissinger–Akahira–Sunose (KAS), Flynn–Wall–Ozawa (FWO), Augis–Bennett and Gao–Wang methods. In addition, Augis–Bennett, Gao–Wang and Matusita methods were used to investigate the nucleation and growth mechanisms and to determine other kinetic parameters including Avrami exponent (n), the rate constant (Kp) and dimensionality of growth (m). The obtained results revealed that the activation energy—as well as thermal stability—was changed with minor addition of copper. In addition, the obtained Avrami exponent values were confirmed by Johnson–Mehl–Avrami–Kolmogorov (JMAK) method. The research findings demonstrated that the value of Avrami exponent is changed with minor addition of copper, so that the Avrami exponents of all crystallization stages, except the second peak for copper-free amorphous alloy, were equal to integer values ranging from two to four, indicating that the growth mechanisms were controlled by interface. Moreover, the kinetic parameters of n and b for all peaks were increased by an increase in crystallization temperature, which can be attributed to the increase in the nucleation rate.

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“…In the present work, a crystallization kinetics study was performed under isochronal or non-isothermal conditions, as most Fe-based alloys are treated in this way [3,[10][11][12][13]. Global activation energies (E a ), both nucleation (associated to inset crystallization temperature-T x1 ) and growth (associated to peak temperature-T p ) [14], are determined by Kissinger [16,17]. From DSC curves and partial area technique, the crystallized volume fraction χ can be calculated as χ = S/S 0 where S corresponds to the area at any temperature between the onset and the end of the exothermic event, and S 0 to the total area under the peak [18].…”

Section: Introductionmentioning

confidence: 99%

Effect of cobalt content on nonisothermal crystallization kinetics of Febased amorphous alloys

Parra-Velásquez

Perea-Cabarcas

Bolivar-Osorio

2020

Rev.Fac.Ing.Univ.Antioquia

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In the present study, FeSiBP and FeCoSiBP ribbons with a fully amorphous structure were made by melt spinning technique. A detailed analysis of the isochronal crystallization behavior is presented in this paper. The influence of cobalt on the crystallization kinetics of the alloys was studied under isochronal conditions using differential scanning calorimetry (DSC). Apparent and local activation energy values were determined by Kissinger, Ozawa and Kissinger-Akahira-Sunose (KAS) methods. The results indicate that appropriate amounts of cobalt can significantly enhance the thermal stability of Fe-based alloys, through an increase in nucleation activation energy from 538kJ/mol to 701kJ/mol, obtained by Kissinger method. Furthermore, with the method proposed by Matusita, it was possible to obtain global values for the Avrami exponent, noting that from a general perspective, Co changes the mechanism from diffusion controlled to interface controlled. This leads to the conclusion that the crystallization process is complex and takes place in more than one stage. Therefore, the determination of nucleation mechanisms and dimensional growth is difficult due to the inapplicability of the Johnson-Melh-Avrami (JMA) model. As such, a study under isothermal conditions is suggested, in order to achieve a full understanding of the mechanisms involved.

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Thermal stability and crystallization process in a Fe-based bulk amorphous alloy: The kinetic analysis

Cited by 43 publications

References 56 publications

The effect of agarose content on the morphology, phase evolution, and magnetic properties of CoFe₂O₄ nanoparticles prepared by sol‐gel autocombustion method

The effect of agarose content on the morphology, phase evolution, and magnetic properties of CoFe₂O₄ nanoparticles prepared by sol‐gel autocombustion method

Isokinetic Analysis of Fe41Co7Cr15Mo14Y2C15B6 Bulk Metallic Glass: Effect of Minor Copper Addition

Effect of cobalt content on nonisothermal crystallization kinetics of Febased amorphous alloys

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Thermal stability and crystallization process in a Fe-based bulk amorphous alloy: The kinetic analysis

Cited by 43 publications

References 56 publications

The effect of agarose content on the morphology, phase evolution, and magnetic properties of CoFe2O4 nanoparticles prepared by sol‐gel autocombustion method

The effect of agarose content on the morphology, phase evolution, and magnetic properties of CoFe2O4 nanoparticles prepared by sol‐gel autocombustion method

Isokinetic Analysis of Fe41Co7Cr15Mo14Y2C15B6 Bulk Metallic Glass: Effect of Minor Copper Addition

Effect of cobalt content on non­isothermal crystallization kinetics of Fe­based amorphous alloys

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The effect of agarose content on the morphology, phase evolution, and magnetic properties of CoFe₂O₄ nanoparticles prepared by sol‐gel autocombustion method

The effect of agarose content on the morphology, phase evolution, and magnetic properties of CoFe₂O₄ nanoparticles prepared by sol‐gel autocombustion method

Effect of cobalt content on nonisothermal crystallization kinetics of Febased amorphous alloys