Die Gitterkonstante geordneter und ungeordneter Eisen-Silicium-Legierungen

Richter, Friedhelm; Pepperhoff, Werner

doi:10.1002/srin.197402522

Cited by 10 publications

(7 citation statements)

References 3 publications

(1 reference statement)

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“…This indicates that increasing annealing temperature enhances the concentration of Si in the bcc-Fe(Si) phase. Namely, at 530 3 C, lattice constant of a ¼ 0:299 nm of bcc-Fe(Si) phase corresponds to the bccFe 87.6 Si 12.4 phase [12]. Lattice constant decreases to 0.285 nm at 580 3 C confirming the existence of the bcc-Fe 85.5 Si 14.5 phase [12].…”

Section: Resultsmentioning

confidence: 71%

Crystallisation progress in Si-rich ultra-soft nanocomposite alloy fabricated by melt spinning

Ngo¹,

Mahmud²,

Nguyen³

et al. 2010

Journal of Magnetism and Magnetic Materials

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Section: Resultsmentioning

confidence: 71%

Crystallisation progress in Si-rich ultra-soft nanocomposite alloy fabricated by melt spinning

Ngo¹,

Mahmud²,

Nguyen³

et al. 2010

Journal of Magnetism and Magnetic Materials

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“…The study of Fe-Si solid solutions presents many puzzling problems [1][2][3][4][5][6][7][8][9][10]. The data reported on Fe-Si alloys containing more than 10 at % Si are contradictory, primarily because the diffraction patterns of these alloys show sets of additional reflections which defy unambiguous interpretation.…”

Section: Introductionmentioning

confidence: 98%

“…Evidence that the B 2 phase (FeSi) is formed over the entire alloy at lower silicon concentrations in comparison with the DO 3 phase (Fe 3 Si) was found in x-ray diffraction (XRD) and electron-microscopic studies [1][2][3][4][5][6][7][8][9][10][11][12]. The variation in the intensity of additional reflections in selected area electron diffraction (SAED) patterns of Fe-Si alloy containing 10-12.5 at % Si was attributed in a number of studies not to B 2 + DO 3 ordering but to the presence of a high density of antiphase boundaries in the DO 3 superstructure [13].…”

Section: Introductionmentioning

confidence: 99%

Ordering of Fe-Si phases

Ustinovshchikov¹,

Sapegina²

2005

Inorg Mater

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The microstructure of Fe-Si alloys containing 8 and 15.5 at % Si and heat-treated between 550 and 1200 ° C is studied by transmission electron microscopy, and the phase composition of alloys containing 19 and 23 at % Si is determined by x-ray diffraction. The Fe-15.5 at % Si alloy heat-treated above 700 ° C is found to consist of a disordered solid solution and B 2 phase. The B 2 particles can be thought of as portions of {100} layers consisting entirely of Si atoms and sandwiched between {100} layers of Fe atoms, that is, as a twodimensional phase. At t ≤ 675°C , a compositionally modulated microstructure develops in which the Si-enriched zones have the Fe 3 Si stoichiometry and DO 3 structure. At high temperatures, the Fe-19 at % Si alloy consists of the α and Ç 2 phases, and the Fe-23 at % Si alloy consists of the α and DO 3 phases. These findings are at variance with the generally accepted Fe-Si phase diagram.

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“…The phase diagram was presented in [5], wherein up to ~10 at.%, the α-phase, which is a disordered solution of silicon in the bcc iron, is stable. With the growing concentration of silicon to 6 at.%, there is a weak 0.22 % decrease of the bcc lattice constant [6]. With a subsequent increase in the silicon content, the system will be a mixture of an α 1 -phase (Fe 3 Si) with a D0 3 lattice and an α 2 -phase (FeSi) with a B2 structure.…”

Section: Introductionmentioning

confidence: 99%

Silicon impact on carbon ordering at the martensite lattice: molecular dynamics simulations

Chirkov¹,

Мирзоев²,

Мирзаев³

2017

LoM

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Despite their widespread use in the industry, silicon-alloyed bainitic steels remain insufficiently studied in many respects. For instance, there is no available information on the impact of silicon impurities on the properties of martensitic structure. The present article deals with this issue. The results of a computer simulation of the impact of silicon impurities on the tetragonal distortion of martensite lattice and the interaction of carbon atoms in a body-centered cubic (bcc) lattice of iron using the molecular dynamics method are presented. Interatomic potentials that make it possible to describe the interactions of Fe-Si-C in martensite within the framework of the embedded atom model (EAM) are developed. It has been established that when silicon is added to steel, the lattice constant c decreases noticeably and the constant a increases slightly. The tetragonality expressed by c / a ratio decreases with respect to the results of Kurdyumov's experiment for any carbon concentrations. The impact of silicon on the formation of martensite was studied by minimizing the energy of the strain-induced interaction parameter λ 2 (0) from the order-disorder transition theory in Zener-Khachaturyan interstitial solutions, which determines the critical temperature of the bcc-bct (body-centered tetragonal) transition. The calculations do not confirm the direct proportional dependence of the change in the tetragonality of martensite and the nature of carbon activity variation during alloying with silicon, which increases activity but decreases tetragonality.

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Die Gitterkonstante geordneter und ungeordneter Eisen-Silicium-Legierungen

Abstract: Ermittlung der Gitterkonstanten geordneter Eisen‐Silicium‐Legierungen durch röntgenographische und Dichtemessungen. Untersuchung des Einflusses der Abkühlungsgeschwindigkeit auf den Ordnungsgrad zur Abschätzung der Unterdrückbarkeit der Ordnung durch Abschrecken.

Cited by 10 publications

References 3 publications

Crystallisation progress in Si-rich ultra-soft nanocomposite alloy fabricated by melt spinning

Crystallisation progress in Si-rich ultra-soft nanocomposite alloy fabricated by melt spinning

Ordering of Fe-Si phases

Silicon impact on carbon ordering at the martensite lattice: molecular dynamics simulations

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