Crystallization and magnetic properties of Fe40Ni38B18Mo4 amorphous alloy

Du, S.W.; Ramanujan, R.V.

doi:10.1016/j.jnoncrysol.2005.07.028

Cited by 31 publications

(21 citation statements)

References 35 publications

(40 reference statements)

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“…The second way of classifying these processing techniques is based on the processing technique used to produce the nanocrystalline material. This classification technique contains several different categories: (I) powder metallurgy processing methods, such as mechanical alloying either with external consolidation of ball-milled powders (most typically used) or with in situ consolidation; (II) inert gas condensation and consolidation of nanostructured powders; [13][14][15][16] (III) crystallization of amorphous precursors; 17,18 (IV) severe plastic deformation of microcrystalline materials, 2,19,20 e.g., equal-channel angular extrusion (ECAE) or high-pressure torsion; and (V) deposition methods such as electrodeposition, 21,22 physical vapor deposition, or e-beam deposition. 23 All of these processes fall into either the ''top-down'' (e.g., severe plastic deformation) or ''bottom-up'' (e.g., electrodeposition and mechanical alloying) approaches.…”

Section: Processing Challenges For Bulk Nanocrystalline Materialsmentioning

confidence: 99%

“Bulk” Nanocrystalline Metals: Review of the Current State of the Art and Future Opportunities for Copper and Copper Alloys

Tschopp

Murdoch

Kecskes

et al. 2014

JOM

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It is a new beginning for innovative fundamental and applied science in nanocrystalline materials. Many of the processing and consolidation challenges that have haunted nanocrystalline materials are now more fully understood, opening the doors for bulk nanocrystalline materials and parts to be produced. While challenges remain, recent advances in experimental, computational, and theoretical capability have allowed for bulk specimens that have heretofore been pursued only on a limited basis. This article discusses the methodology for synthesis and consolidation of bulk nanocrystalline materials using mechanical alloying, the alloy development and synthesis process for stabilizing these materials at elevated temperatures, and the physical and mechanical properties of nanocrystalline materials with a focus throughout on nanocrystalline copper and a nanocrystalline Cu-Ta system, consolidated via equal channel angular extrusion, with properties rivaling that of nanocrystalline pure Ta. Moreover, modeling and simulation approaches as well as experimental results for grain growth, grain boundary processes, and deformation mechanisms in nanocrystalline copper are briefly reviewed and discussed. Integrating experiments and computational materials science for synthesizing bulk nanocrystalline materials can bring about the next generation of ultrahigh strength materials for defense and energy applications.

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Section: Processing Challenges For Bulk Nanocrystalline Materialsmentioning

confidence: 99%

“Bulk” Nanocrystalline Metals: Review of the Current State of the Art and Future Opportunities for Copper and Copper Alloys

Tschopp

Murdoch

Kecskes

et al. 2014

JOM

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“…Du et al 8 performed in situ X-ray diffraction to study the Fe 40 Ni 38 Mo 4 B 18 crystallization at 693 K for different annealing times, and the crystallization product was found to be Fe-Ni phase and (FeNiMo) 23 B 6 phase appears after 48 hours of annealing.…”

Section: Methodsmentioning

confidence: 99%

Hydrogen gas permeation through amorphous and partially crystallized Fe40Ni38Mo4B18

Ribeiro¹,

Lemus²,

Santos³

2012

Mat. Res.

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gas permeation from 523 to 643 K. The hydrogen permeation curves exhibited a single sigmoidal shape, typical of tests where no hydride formation occurs. It was observed that the hydrogen diffusivity increases for the amorphous samples and partially crystallized alloy with the temperature increase. The hydrogen diffusion coefficient as a function of temperature was found to be D = 5.1 ± 0.5 × 10 -12 exp (-11.0 ± 3.5/RT) (m ) for the partially crystallized condition. This suggests that the annihilation of defects in the amorphous structure and the crystalline phase precipitate contributes to the increase of the hydrogen diffusion.

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“…The alloy is amorphous in nature and commercially available in the form of ribbons, with typical thickness of 20 μm and length of a few centimeters in length. The amorphous structure can be devitrified into a nanocrystalline state by thermal annealing or ion irradiation [5][6][7]. A nanocrystalline morphology is more favorable for superior soft magnetic properties since the microstructure of nanocrystals in an amorphous matrix can yield superior soft magnetic properties compared to their amorphous counterpart [8].…”

mentioning

confidence: 99%

“…Various reports are available in literature regarding the kinetics of crystallization of Fe 40 Ni 38 Mo 4 B 16 [6,7,[9][10][11]. The enthalpy of formation and activation energy can be evaluated by employing various methods such as the Kissinger [12], Moyniham [13], and Marseglia [14] techniques.…”

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confidence: 99%

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Structural, topographical and magnetic evolution of RF-sputtered Fe-Ni alloy based thin films with thermal annealing

Lisha¹,

Thomas²,

Geetha³

et al. 2014

Mater. Res. Express

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Metglas 2826 MB having a nominal composition of Fe 40 Ni 38 Mo 4 B 18 is an excellent soft magnetic material and finds application in sensors and memory heads. However, the thin-film forms of Fe 40 Ni 38 Mo 4 B 18 are seldom studied, although they are important in micro-electro-mechanical systems/nano-electromechanical systems devices. The stoichiometry of the film plays a vital role in determining the structural and magnetic properties of Fe 40 Ni 38 Mo 4 B 18 thin films: retaining the composition in thin films is a challenge. Thin films of 52 nm thickness were fabricated by RF sputtering technique on silicon substrate from a target of nominal composition of Fe 40 Ni 38 Mo 4 B 18 . The films were annealed at temperatures of 400°C and 600°C. The micro-structural studies of films using glancing x-ray diffractometer (GXRD) and transmission electron microscope (TEM) revealed that pristine films are crystalline with (FeNiMo) 23 B 6 phase. Atomic force microscope (AFM) images were subjected to power spectral density analysis to understand the probable surface evolution mechanism during sputtering and annealing. X-ray photoelectron spectroscopy (XPS) was employed to determine the film composition. The sluggish growth of crystallites with annealing is attributed to the presence of molybdenum in the thin film. The observed changes in magnetic properties were correlated with annealing induced structural, compositional and morphological changes.

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Crystallization and magnetic properties of Fe40Ni38B18Mo4 amorphous alloy

Cited by 31 publications

References 35 publications

“Bulk” Nanocrystalline Metals: Review of the Current State of the Art and Future Opportunities for Copper and Copper Alloys

“Bulk” Nanocrystalline Metals: Review of the Current State of the Art and Future Opportunities for Copper and Copper Alloys

Hydrogen gas permeation through amorphous and partially crystallized Fe40Ni38Mo4B18

Structural, topographical and magnetic evolution of RF-sputtered Fe-Ni alloy based thin films with thermal annealing

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