Study of the local structure of metastable crystalline iron-boron alloys

Budnick, J. I.; Sánchez, F. H.; Zhang, Y.; Choi, Minkyung; Hines, W.A.; Zhang, Z.; Ge, Shi Hui; Hasegawa, R.

doi:10.1109/tmag.1987.1065182

Cited by 23 publications

(6 citation statements)

References 16 publications

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“…These consist of a fine dispersion of minute boride particles or complexes embedded in an a-iron matrix, with SRO identified as o-Fe3B type.6 HREM measurements have shown diameters between 5 and 15 A for these regions. 7 These results together with those obtained from n B and 10B spin-echo NMR and extended x-ray absorption fine structure at the Fe sites are reviewed in Ref. 7.…”

Section: Introductionmentioning

confidence: 95%

On the microstructure and thermal stability of rapidly quenched Fe–B alloys in the intermediate composition range between the crystalline and amorphous states

1995

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The structure and the thermal stability of the Fe0.89B0.11 rapidly quenched alloy have been investigated. Transmission Mössbauer measurements were carried out as a function of temperature in the range from 148 K to 513 K. Room temperature x-ray diffraction and transmission and conversion-electron Mössbauer experiments, as well as 4.2 K spin-echo nuclear magnetic resonance measurements, were also performed after some selected thermal treatments for one hour between 523 K and 1273 K. Based on these experiments it is suggested that the alloy is inhomogeneous at nanoscopic scale and consists of a fine dispersion of a defective boride phase with an o-Fe3B-like short-range order, embedded in an α-Fe matrix. This result gives support to the models which indicate phase separation in the amorphous phase with o-Fe3B short-range order prevailing in the hypereutectic iron concentration range. This phase was found to be less stable than the undefective one present in the less boron concentrated alloys. The transformation into the equilibrium phases, analyzed with an Arrhenius-type temperature dependence for the increase of the relative fraction of Fe2B, led to an activation energy Ea = 1.38 ± 0.68 eV/atom.

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Section: Introductionmentioning

confidence: 95%

On the microstructure and thermal stability of rapidly quenched Fe–B alloys in the intermediate composition range between the crystalline and amorphous states

1995

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“…18 Heterogeneities have also been observed in FeB at concentrations just below the eutectic point. 19 Although they were not fully identified, they were associated with the highly metastable orthorhombic Fe 3 B phase, of similar structure as cementite, which has reported Invar properties. 20,21 Magnetostriction in FeB has been attributed to this phase although with no conclusive proofs.…”

Section: Introductionmentioning

confidence: 99%

Determination of the magnetostrictive atomic environments in FeCoB alloys

et al. 2012

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The atomic environments of Fe and Co involved in the magnetostriction effect in FeCoB alloys have been identified by differential extended x-ray fine structure (DiffEXAFS) spectroscopy. The study, done in amorphous and polycrystalline FeCoB films, demonstrates that the alloys are heterogeneous and that boron plays a crucial role in the origin of their magnetostrictive properties. The analysis of DiffEXAFS in the polycrystalline and amorphous alloys indicates that boron activates magnetostriction when entering as an impurity into octahedral interstitial sites of the Fe bcc lattice, causing its tetragonal distortion. Magnetostriction would be explained then by the relative change in volume when the tetragonal axis of the site is reoriented under an externally applied magnetic field. The experiment demonstrates the extreme sensitivity of DiffEXAFS to characterize magnetostrictive environments that are undetectable in their related EXAFS spectra.

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“…Beginning with T ann = 700°C, an equilibrium body-centered tetragonal boride t-Fe 2 B is formed; simultaneously, metastable boride o-Fe 3 B is found. As is seen from the comparison of these data with the dashed diffraction patterns [29] and the dashed distribution functions P(H) [1,15,17,30,31] presented for the borides at the bottom of Figs. 1 and 2, the highest content of o-Fe 3 B results from annealing at 800°C.…”

Section: Isochronous (1 H) Annealing At 300-900°cmentioning

confidence: 91%

Peculiarities of the Transition to an Equilibrium State of Mechanically Alloyed Fe/Amorphous Phase Fe-B/B Nanocomposite with Composition Fe(68)B(32) upon Thermal Treatment

et al. 2005

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The methods of X-ray diffraction, Mössbauer spectroscopy, and magnetic measurements are employed to study the structural and phase transformations in the course of isochronous (1 h) annealing at 300-900 ° C and isothermal (350 ° C) annealing of a mechanically alloyed Fe/amorphous phase Fe-B/B s nanocomposite with a total boron content of 32 at %. Common and specific regularities are established for the sequence of solid-phase reactions as compared to amorphous Fe-B alloys prepared by melt quenching. The observed differences are explained by a high thermal stability of the nanostructure in the mechanically alloyed Fe-B system due to the presence of boron atoms B s segregated at the intergrain boundaries.

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Study of the local structure of metastable crystalline iron-boron alloys

Cited by 23 publications

References 16 publications

On the microstructure and thermal stability of rapidly quenched Fe–B alloys in the intermediate composition range between the crystalline and amorphous states

On the microstructure and thermal stability of rapidly quenched Fe–B alloys in the intermediate composition range between the crystalline and amorphous states

Determination of the magnetostrictive atomic environments in FeCoB alloys

Peculiarities of the Transition to an Equilibrium State of Mechanically Alloyed Fe/Amorphous Phase Fe-B/B Nanocomposite with Composition Fe(68)B(32) upon Thermal Treatment

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