Effect of boron on structural and magnetic properties of the Fe60Al40 system prepared by mechanical alloying

Rico, M.; Grenèche, Jean‐Marc; Alcázar, G. A. Pérez

doi:10.1016/j.jallcom.2005.02.029

Cited by 45 publications

(19 citation statements)

References 17 publications

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“…The values of average q.s. obtained for this sample (0.52 mm/s) is close to but larger than the values reported for ordered FeAl 2 [35], and slightly higher than the value of 0.48 mm/s reported for disordered FeAl 2 [4], indicating the possibility that an FeAl 2 like phase is formed for the Fe-66 at.% Al composition. Mechanical alloying being a high energy, non-equilibrium process, in addition to producing a high degree of chemical disorder, also introduces defects and strain.…”

Section: Mössbauer Studiessupporting

confidence: 58%

“…Quadrupole splitting (Q.S), Isomer shift (I.S), width of quadrupole peaks and average hyperfine field (H av ) from room temperature Mössbauer spectra for Fe (100−x) Al x Isomer shift values are quoted with respect to metallic Fe.phase would be non-magnetic, presence of Fe at the disordered grain boundaries would give rise to a magnetic hyperfine field[22,35]. The low solubility of Fe in Al then accounts for the nearly constant value of this component in all the spectra.The intermediate component H 2 of ∼22.5 T is typical of disordered Fe-Al in a bcc structure…”

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confidence: 99%

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Mössbauer study of incompletely alloyed nanocrystalline Fe100 − x Al x prepared by high energy ball milling

2007

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Mechanically alloyed Fe 100−x Al x powders, with 20≤x≤90, have been studied by X-ray diffraction and room temperature 57 Fe Mössbauer spectroscopy. The milling time was chosen such that complete alloying does not take place. For a fixed milling time of 10 h, the rate of alloying was seen to increase exponentially with increase in Fe content. Mössbauer spectra of all the samples consist of a broad magnetic sextet and a quadrupole doublet. The isomer shifts and quadrupole splitting of the doublets are typical of Al-rich, Fe-Al alloys. The area under the quadrupole doublet is a maximum for x=66. Analysis of the Mössbauer spectra indicates the formation off-stoichiometric Fe 3 Al phase for x<66, while the formation of Fe clusters is largely responsible for the magnetic hyperfine component in x≥66 compositions.

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Section: Mössbauer Studiessupporting

confidence: 58%

mentioning

confidence: 99%

Mössbauer study of incompletely alloyed nanocrystalline Fe100 − x Al x prepared by high energy ball milling

2007

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“…[4,5] From the mechanical properties point of view, it has been observed that reducing the crystallite size to the nanometer range, [6,7] the addition of small quantity of boron (<1 at. pct B) to this alloy and/or additional heat treatment [8][9][10][11] improve its ductility considerably. Moreover, the Fe-Al alloy is lighter than steels or Ni-based alloys.…”

Section: Nanocrystalline (Nc) Fe-al Intermetallicmentioning

confidence: 99%

Structural and Thermal Study of Nanocrystalline Fe-Al-B Alloy Prepared by Mechanical Alloying

Gharsallah

Sekri

Azabou

et al. 2015

Metall Mater Trans A

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Nanostructured iron-aluminum alloy of Fe-25 at. pct Al composition doped with 0.2 at. pct B was prepared by mechanical alloying. The phase transformations and structural changes occurring in the studied material during mechanical alloying and during subsequent heating were investigated by SEM, XRD, and DSC techniques. The patterns so obtained were analyzed using the Rietveld program. The alloyed powders were disordered Fe(Al) solid solutions and Fe 2 B boride phase. The Fe 2 B boride phase is formed after 4 hours of milling. The crystallite size reduction to the nanometer scale (5 to 8 nm) is accompanied by an increase in lattice strains. The powder milled for 40 hours was annealed at temperatures of 523 K, 823 K, 883 K, and 973 K (250°C, 550°C, 610°C, and 700°C) for 2 hours. Low temperatures annealing are responsible for the relaxation of the disordered structure, while high temperatures annealing enabled supersaturated Fe(Al) solid solutions to precipitate out fines Fe 3 Al, Fe 2 Al 5 , and Fe 4 Al 13 intermetallics and, also the recrystallization and the grain growth phenomena.

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“…When ordered Fe-40 at.% Al was subjected to ball milling, three types of structural changes occurred: nanocrystallization, loss of long-range order (LRO), and destruction of chemical short-range order (CSRO) [1]. A new nanostructured system, FeAlB, with high content of boron, was prepared by mechanical alloying in a high-energy ball mill; its structural and magnetic properties were investigated [2]. In the recent past, there have been many reports on MEA of Fe-50 at.% Al [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Phase transformation, structural evolution, and mechanical property of nanostructured feal as a result of mechanical alloying

Hegde

Surendranathan

2009

Powder Metall Met Ceram

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The objective of the work is to synthesize nanostructured FeAl alloy powder by mechanical alloying (MEA). The work concentrates on the synthesis, characterization, and structural and mechanical properties of the alloy. Nanostructured FeAl intermetallics are prepared directly by MEA in a highenergy ball mill. Milling is performed under toluene solution to avoid contamination from the milling media and atmosphere. Mixtures of elemental Fe and Al are progressively transformed into a partially disordered solid solution with an average composition of Fe-50 at.% Al. Phase transformation, structural changes, morphology, particle size measurement, and chemical composition during MEA are investigated by X ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive x-ray spectroscopy (EDS). Vickers microhardness (VMH) indentation tests are performed on the powders. The XRD and SEM studies reveal the alloying of elemental powders as well as transition to nanostructured alloy; crystallite size of 18 nm is obtained after 28 h of milling. Expansion/contraction in lattice parameter accompanied by reduction in crystallite size occurs during transition to nanostructured alloy. Longer milling introduces ordering in the alloyed powders as proved by the presence of superlattice reflection. Elemental and alloyed phases coexist while hardness increases during MEA.

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Effect of boron on structural and magnetic properties of the Fe60Al40 system prepared by mechanical alloying

Cited by 45 publications

References 17 publications

Mössbauer study of incompletely alloyed nanocrystalline Fe100 − x Al x prepared by high energy ball milling

Mössbauer study of incompletely alloyed nanocrystalline Fe100 − x Al x prepared by high energy ball milling

Structural and Thermal Study of Nanocrystalline Fe-Al-B Alloy Prepared by Mechanical Alloying

Phase transformation, structural evolution, and mechanical property of nanostructured feal as a result of mechanical alloying

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