Structural and Magnetic Study of the Fe2Nb Alloy Obtained by Mechanical Alloying and Sintering

Vélez, G. Y.; Alcázar, G. A. Pérez; Zamora, Ligia E.; Tabares, J. A.

doi:10.1007/s10948-013-2428-5

Cited by 7 publications

(8 citation statements)

References 8 publications

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“…In fact, the very different Curie temperatures between the crystalline and the amorphous phases containing Fe, being below room temperature for the amorphous and well above room temperature for the bcc Fe, makes Mössbauer spectrometry a very sensitive technique for estimating the ratio between them. This assignment (sextets for Fe atoms in ferromagnetic α-Fe phase and singlets or doublets for Fe atoms in paramagnetic amorphous) is generally found in the literature concerning Mössbauer studies of Fe-Zr and Fe-Nb alloys [41][42][43][44][45] with similar compositions to those studied here. Further details on the microstructures of the studied samples can be found in [23].…”

Section: Simulations Based On a Probabilistic Activation Of The Amorpsupporting

confidence: 83%

On the Use of JMAK Theory to Describe Mechanical Amorphization: A Comparison between Experiments, Numerical Solutions and Simulations

Blázquez

Manchón-Gordón

Ipus

et al. 2018

Metals

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The kinetics of amorphization during ball milling is generally analyzed using two different approaches: the classical Johnson-Mehl-Avrami-Kolmogorov (JMAK) theory and Delogu and Cocco's model for which a region deterministically transforms after it reaches a certain number of collisions. The application of JMAK analysis to the latter model predicts Avrami exponents to be higher than the experimental ones (typically close to one). We develop simulations based on the probabilistic character of the nucleation phenomenon and concave growth of the amorphous phase in the core of a nanocrystal. The predictions of our simulations are in good agreement with the low Avrami exponents and with the size evolution of the remaining crystallites found experimentally. From these values, the parameters involved in the simulated model (growth rate and probability of nucleation) can be estimated.

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Section: Simulations Based On a Probabilistic Activation Of The Amorpsupporting

confidence: 83%

On the Use of JMAK Theory to Describe Mechanical Amorphization: A Comparison between Experiments, Numerical Solutions and Simulations

Blázquez

Manchón-Gordón

Ipus

et al. 2018

Metals

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“…This value is similar to that reported by El-Eskandarany et al 32 for the crystallization of the amorphous Fe 52 Nb 48 alloy powder obtained by mechanical alloying. Table 1 and can be compared to those reported in the literature for samples prepared by different methods [35][36][37][38] . Table 1.…”

Section: Characterization Of Crystallization Productsmentioning

confidence: 99%

“…Although they reported clearly different values for Fe 7 Nb 6 intermetallic, it is worth mentioning that this phase was not detected in their XRD patterns. In the work of Velez et al36 , the Fe 7 Nb 6 phase was not detected from X-ray patterns but they reported two doublets to fit the Mössbauer spectra. However, they attributed the values of the second one (Q=0.41±0.05 mm/s and =0.02±0.01), which are close to those assigned in our study to Fe 7 Nb 6 , to "the contribution of the hcp amorphous grain boundaries and to the incoherent surface of these grains".…”

mentioning

confidence: 99%

Devitrification of Mechanically Alloyed Fe-Nb System: Mössbauer Study of the Intermetallic Phases

Manchón-Gordón

Švec

Ipus

et al. 2020

Metall Mater Trans A

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Intermetallic phases in the Fe-Nb system have been obtained as products of the devitrification of a homogeneous amorphous Fe 70 Nb 30 alloy prepared by mechanical alloying. Besides Fe 2 Nb Laves and Fe 7 Nb 6 intermetallic phases,-Fe phase has been detected by X-ray diffraction (XRD). Hyperfine parameters for both Fe 2 Nb and Fe 7 Nb 6 intermetallics have been obtained from Mössbauer spectroscopy in correlation with phase identification from XRD results. Thermomagnetic measurements show changes in the Curie temperatures of the amorphous and Fe 2 Nb phases during the crystallization, due to compositional variations related to the developing of the-Fe phase. Kinetics of the crystallization process has been analyzed using the classical Johnson-Mehl-Avrami-Kolmogorov kinetic theory in both isothermal and nonisothermal regimes.

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“…Studying Fe-Nb binary system alloys via the MA process is important because it can provide alternative processes, like viable results for better understanding the system phase equilibrium, and for many alloy families based on Fe-Nb 8,9 . Some works have detailed this [10][11][12][13][14][15][16][17][18][19] . Most studies on Fe-Nb systems 10,12,13,[15][16][17][18] deal with systemically studying phase amorphization modes via the MA process, using milling times varying from 30 minutes to 70 hours.…”

Section: Introductionmentioning

confidence: 99%

“…Some works have detailed this [10][11][12][13][14][15][16][17][18][19] . Most studies on Fe-Nb systems 10,12,13,[15][16][17][18] deal with systemically studying phase amorphization modes via the MA process, using milling times varying from 30 minutes to 70 hours. Povstugar et al 13 , in addition to using MA, developed a heat treatment at 700 °C.…”

Section: Introductionmentioning

confidence: 99%

Effect of Process Control Agents on Fe-15at.%Nb powder during Mechanical Alloying

et al. 2022

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In this paper, Fe-15at.%Nb alloys were produced from high purity Fe (min. 99.8%) and Nb (min. 99.8%) powders via a mechanical alloying process. The effects of different Process Control Agents (i.e., methanol, hexane, and stearic acid) were investigated with powder morphologies, particle size distribution, and phase formation, and were sampled after up to 80 milling hours at 350 rpm. The powder morphologies and particle sizes were evaluated using scanning electron microscopy and laser diffraction analysis, respectively, and phases were identified via X-ray powder diffractometry. The results demonstrate for all conditions that, in the early stages, there was significant particle agglomeration due to the ductile-ductile feature of Fe and Nb powders, and latter an amorphization trend up to 80 milling hours. Methanol was the most efficient Process Control Agent in terms of avoiding cold welding, reducing of agglomeration, particle size distribution, reducing contamination and crystallinity reduction rate.

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Structural and Magnetic Study of the Fe2Nb Alloy Obtained by Mechanical Alloying and Sintering

Cited by 7 publications

References 8 publications

On the Use of JMAK Theory to Describe Mechanical Amorphization: A Comparison between Experiments, Numerical Solutions and Simulations

On the Use of JMAK Theory to Describe Mechanical Amorphization: A Comparison between Experiments, Numerical Solutions and Simulations

Devitrification of Mechanically Alloyed Fe-Nb System: Mössbauer Study of the Intermetallic Phases

Effect of Process Control Agents on Fe-15at.%Nb powder during Mechanical Alloying

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