Internal Friction of Boron

Tavadze, F.N.; Bairamashvili, I. A.; Metreveli, V. Sh.; Tsagareishvili, G.V.

doi:10.1007/978-1-4899-4725-3_6

Cited by 2 publications

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“…The location of B in bcc Fe (and similar in bcc Fe-Co) is still under debate. Boron can substitute Fe in the ideal bcc positions [27][28][29] , can occupy interstitial positions [30][31][32][33] , and B solution in Fe can be stabilized by Ni, N and C 34,35 both, interstitially and substitutionally 36 . In a more recent theoretical investigation 37 , it was shown that B prefers the substitutional chemical disorder in bulk Fe-B.…”

Section: Introductionmentioning

confidence: 99%

From soft to hard magnetic Fe–Co–B by spontaneous strain: a combined first principles and thin film study

Reichel

Schultz

Pohl

et al. 2015

J. Phys.: Condens. Matter

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In order to convert the well-known Fe-Co-B alloy from a soft to a hard magnet, we propose tetragonal strain by interstitial boron. Density functional theory reveals that when B atoms occupy octahedral interstitial sites, the bcc Fe-Co lattice is strained spontaneously. Such highly distorted Fe-Co is predicted to reach a strong magnetocrystalline anisotropy which may compete with shape anisotropy. To probe this theoretical suggestion experimentally, epitaxial films are examined. A spontaneous strain up to 5% lattice distortion is obtained for B content up to 4 at%, which leads to uniaxial anisotropy constants exceeding 0.5 MJ m(-3). However, a further addition of B results in a partial amorphisation, which degrades both anisotropy and magnetisation.

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Section: Introductionmentioning

confidence: 99%

From soft to hard magnetic Fe–Co–B by spontaneous strain: a combined first principles and thin film study

Reichel

Schultz

Pohl

et al. 2015

J. Phys.: Condens. Matter

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“…As shown by experimental evidence [24], the internal damping is mainly due to the relaxation phenomenon and is strongly dependent on temperature, frequency, and mechanical hysteresis, which demonstrates a strong dependence on the amplitude and does not show a significant dependence on the frequency.…”

Section: Torsional Pendulum With Hysteretic Damping Modelmentioning

confidence: 91%

The Magnetoelastic Contribution to the Steel Internal Damping

Conte

2023

Materials

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In this paper, the steel internal damping due to both the thermoelastic and the magnetoelastic phenomena has been investigated through a formulation based on thermodynamical potential joints with a hysteretic damping model. With the aim of focusing on the temperature transient in the solid, a first configuration has been considered, which is characterized by a steel rod with an imposed alternating pure shear strain in which only the thermoelastic contribution was studied. The magnetoelastic contribution was then introduced in a further configuration, in which a steel rod in free motion was subjected to torsion on its ends in the presence of a constant magnetic field. A quantitative assessment of the influence of the magnetoelastic dissipation in steel has been computed according to the Sablik-Jiles model by giving a comparison between the thermoelastic and the prevailing magnetoelastic damping coefficients.

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Internal Friction of Boron

Cited by 2 publications

References 0 publications

From soft to hard magnetic Fe–Co–B by spontaneous strain: a combined first principles and thin film study

From soft to hard magnetic Fe–Co–B by spontaneous strain: a combined first principles and thin film study

The Magnetoelastic Contribution to the Steel Internal Damping

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