Non-isothermal kinetic analysis of nano-crystallization process in (Fe41Co7Cr15Mo14Y2C15)94B6 amorphous alloy

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

doi:10.1016/j.tca.2017.03.017

Cited by 38 publications

(17 citation statements)

References 44 publications

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“…Hence, to investigate the effect of copper addition on the nucleation and growth mechanisms of Fe 41 Co 7 Cr 15 Mo 14 Y 2 C 15 B 6 BMG, an isokinetic analysis is performed. For this purpose, according to the data extracted from the DSC curves [ 17 , 49 ], the degree of conversion versus temperature ( T ) can be obtained for the various crystallization stages, and then the dependence of E α on a wide range of α is calculated by using FWO [ 42 , 43 ] and KAS [ 41 ] isoconversional methods. The KAS and FWO are derived from integral isoconversional methods based on Equations (1) and (2), respectively:

where E α (kJ/mol) is the local activation energy; R (J/mol·K) is the universal gas constant; β (°C/min) is the heating rate; and T (K) is the absolute temperature.…”

Section: Resultsmentioning

confidence: 99%

“…Cylindrical samples with a diameter of 2 mm and a length of 70 mm were produced by suction copper-mold casting. Solid-state processes have been extensively studied by using thermal analysis techniques [ 47 , 48 , 49 ]. Therefore, the thermal stability and isokinetic analysis of the as-cast specimens were evaluated by using a differential scanning calorimetry (DSC, NETZSCH DSC 404C, NETZSCH-Gerätebau GmbH, Selb, Germany) at continuous heating rates of 5, 10 and 20 °C/min.…”

Section: Methodsmentioning

confidence: 99%

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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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where E α (kJ/mol) is the local activation energy; R (J/mol·K) is the universal gas constant; β (°C/min) is the heating rate; and T (K) is the absolute temperature.…”

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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

et al. 2020

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“…Rapid solidification is a useful method to achieve an amorphous + nanocrystalline microstructure [10]. Amorphous–nanocrystalline structure can also be achieved by controlled crystallization of fully amorphous structure [11,12]. However, both the abovementioned methods are expensive.…”

Section: Introductionmentioning

confidence: 99%

Phase Transformation and Morphology Evolution of Ti50Cu25Ni20Sn5 during Mechanical Milling

et al. 2018

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Nanocrystalline/amorphous powder was produced by ball milling of Ti50Cu25Ni20Sn5 (at.%) master alloy. Both laser diffraction particle size analyzer and scanning electron microscope (SEM) were used to monitor the changes in the particle size as well as in the shape of particles as a function of milling time. During ball milling, the average particle size decreased with milling time from >320 µm to ~38 µm after 180 min of milling. The deformation-induced hardening and phase transformation caused the hardness value to increase from 506 to 779 HV. X-ray diffraction (XRD) analysis was used to observe the changes in the phases/amorphous content as a function of milling time. The amount of amorphous fraction increased continuously until 120 min milling (36 wt % amorphous content). The interval of crystallite size was between 1 and 10 nm after 180 min of milling with 25 wt % amorphous fractions. Cubic Cu(Ni,Cu)Ti2 structure was transformed into the orthorhombic structure owing to the shear/stress, dislocations, and Cu substitution during the milling process.

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“…[15][16][17][18][19] Therefore, it is essential to investigate the crystallization behaviors and crystallization kinetics of MGs at various heating conditions, which is significant for tuning the structures and properties of MGs. Among them, the nonisothermal crystallization behaviors and crystallization kinetics for MGs with various compositions, that is, multicomponent Zr-Cu-Fe-Al MG, 15 Fe-Co-Cr-Ni-Zr MG, 16 Zr-(CuAg)-Al MG, 17 Fe-Ni-P-B MG, 18 Zr-Co-Al-Cu MG, 24 Fe-Ni-Mo-P-C-B-Cu MG, 25 Ti-Zr-Ni-Cu-Be MG, 26 Co-Fe-Ta-B MG, 29 Ni-Nb-Ti-Zr-Co-Ta MG, 31 Fe-Cr-P-C-B MG, 32 and Fe-Co-Cr-Mo-Y-C-B MG 33 ; ternary U-Co-Al MG, 19 La-Al-Co MG, 27 Zr-Al-Fe MG, 30 Zr-Co-Al MGs, 24,35 Fe-P-C MG, 36 Fe-B-C MG, 37 La-Al-Ni MG, 38 and Pd-Ni-P MG 39 ; and binary Cu-Zr MG, 40 have been extensively researched by Kissinger, Ozawa, Kissinger-Akahira-Sunose (KAS), Ozawa-Flynn-Wall (OFW), and Vogel-Fulcher-Tammann (VFT) approaches using differential scanning calorimeter (DSC). Under nonisothermal crystallization conditions, MGs were continuously heated up to complete crystallization by different heating rates.…”

mentioning

confidence: 99%

“…Consequently, it is considered as promising corrosion/wear resistance coating materials to enrich the potential application of MGs. 5 Nevertheless, the current researches of the crystallization kinetics for Crbearing MGs are preferred for MGs with low content (< 20 at.%) of Cr, 16,23,[32][33][34]41,42 and the crystallization kinetics of Cr-containing MGs with high content (>20 at.%) of Cr such as the present Cr-rich MG Cr 29.4 Fe 29.4 Mo 14.7 C 14.7 B 9.8 Y 2 has not been referred, which is severely unfavorable for comprehending the formation and tuning the structures and properties of these MGs. Accordingly, it is of vital significance to uncover the crystallization kinetics of Cr-bearing MGs with high content of Cr.…”

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confidence: 99%

Nonisothermal crystallization kinetics of Cr‐rich metallic glass Cr_29.4Fe_29.4Mo_14.7C_14.7B_9.8Y₂ with desirable properties

Jian

Zhuo

et al. 2021

Int J of Chemical Kinetics

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The nonisothermal crystallization kinetics for the first crystallization event of Cr-rich metallic glass (MG) Cr 29.4 Fe 29.4 Mo 14.7 C 14.7 B 9.8 Y 2 with desirable properties was systematically studied by Kissinger, Ozawa, Kissinger-Akahira-Sunose (KAS), Ozawa-Flynn-Wall (OFW), and Vogel-Fulcher-Tammann approaches using differential scanning calorimeter. The apparent activation energy (E) for characteristic temperatures deduced by Kissinger approach is comparable with that deduced by Ozawa approach. The E g for the glass transition temperature is smaller than the E p1 for the peak temperature of the first crystallization event and larger than E for other characteristic temperatures, exhibiting that the glass transition is easier than the growth process of the first crystallization event and more difficult than other processes. The local activation energy estimated by KAS and OFW approaches shows approximate tendency of increasing initially and then gradually decreasing, which indicates that the crystallization process is difficult at first and then gradually becomes easy. The local Avrami exponent (n(x)) changes from n(x) > 2.5 to 1.5 < n(x) < 2.5 for crystallization under low heating rate and from n(x) > 2.5 to 0 < n(x) < 1.5 for crystallization under high heating rate, corresponding to a diffusion-governed crystallization changing from enhancing nucleation rate to reducing nucleation rate under low heating rate and from enhancing nucleation rate to preexisting nuclei under high heating rate, respectively. The kinetic fragility parameter shows that the glass-forming liquid of the present MG is intermediate type with moderate glass-forming ability. The results would provide comprehensive insights to understand the formation of Cr-rich MG.

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Non-isothermal kinetic analysis of nano-crystallization process in (Fe41Co7Cr15Mo14Y2C15)94B6 amorphous alloy

Cited by 38 publications

References 44 publications

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

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

Phase Transformation and Morphology Evolution of Ti50Cu25Ni20Sn5 during Mechanical Milling

Nonisothermal crystallization kinetics of Cr‐rich metallic glass Cr_29.4Fe_29.4Mo_14.7C_14.7B_9.8Y₂ with desirable properties

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Non-isothermal kinetic analysis of nano-crystallization process in (Fe41Co7Cr15Mo14Y2C15)94B6 amorphous alloy

Cited by 38 publications

References 44 publications

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

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

Phase Transformation and Morphology Evolution of Ti50Cu25Ni20Sn5 during Mechanical Milling

Nonisothermal crystallization kinetics of Cr‐rich metallic glass Cr29.4Fe29.4Mo14.7C14.7B9.8Y2 with desirable properties

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Product

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Nonisothermal crystallization kinetics of Cr‐rich metallic glass Cr_29.4Fe_29.4Mo_14.7C_14.7B_9.8Y₂ with desirable properties