Torsional vibration measurement of the viscosity of a metallic melt

Bel’tyukov, A. L.; Olyanina, N. V.; Lad’yanov, V. I.

doi:10.1134/s0036029516020026

Cited by 10 publications

(4 citation statements)

References 6 publications

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“…The determination by the torsional vibration method is based on measuring the vibration damping factor δ. A number of models and programs is designed to calculate ν from the known δ [1]. The main task of recomputing δ into ν is in comparing samples with various masses, geometries, and densities.…”

Section: Technique Of Experimentsmentioning

confidence: 99%

“…A standard method to record torsional vibrations of a hanger is observation the path of the light beam reflected from the oscillating suspended system [1][2][3][4][5], and the vibration speed is estimated [5] by measuring a time of passage a fixed section l by the light beam (see the Figure 1.) in the vicinity of the equilibrium position of the suspended system, which is much smaller than amplitude of vibrations A i .…”

Section: Technique Of Experimentsmentioning

confidence: 99%

“…Difficulties of the error calculation using these formulas are as follows: to calculate by formulas (1), it is necessary to perform a set of measurements, and, in this case, time differences will be attributed not only to the error but also difference in initial amplitudes t (0) in sets. It is methodically difficult to ensure equality of initial amplitude.…”

Section: Technique Of Experimentsmentioning

confidence: 99%

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Influence of Smelting Technology on Properties of Soft Magnetic Fe-B-Si Alloys

Konashkov

Цепелев

2014

AMM

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The quality of metal production can be different even at identical elemental composition and similar heat treatment. The thermo-time smelting regime influences on structure of a metal melt. The structure of a melt influences on process of a hardening and quality of solid alloy. The thermo-time processing of a melt is very relevant at production of nanocristaline materials. The structure of amorphous ribbon is inherited from a melt. The long-lived relaxation processes can be exist in liquid state. They can lasts units or even tens hours. The thermo-time processing allows to receive an equilibrium melt. The properties of an equilibrium melt depend only on an elemental composition and temperature. The development of thermo-time processing is possible on the basis of analysis of different structural-sensing properties of melts. The thermo-time processing is a combination of heating temperatures and temporary ranges. But more often it is possible to determine temperature at which one a melt passes to an equilibrium state practically instantly. Such temperature is named “critical temperature”. The achievement of “critical temperature” is accompanied by anomalies on relations of properties to temperature. The quality of soft magnetic materials received from melt heated up above than “critical temperature” is higher.

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Section: Technique Of Experimentsmentioning

confidence: 99%

Section: Technique Of Experimentsmentioning

confidence: 99%

Section: Technique Of Experimentsmentioning

confidence: 99%

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Influence of Smelting Technology on Properties of Soft Magnetic Fe-B-Si Alloys

Konashkov

Цепелев

2014

AMM

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“…Крышка в ходе измерений создает вторую торцевую поверхности трения. Её использование позволяет исключить негативное влияние на результаты измерений явлений смачивания и пленочных эффектов [15], что существенно повышает достоверность получаемых данных.…”

Section: Introductionunclassified

Investigations of the Viscosity of the Ternary Co81(B,Si)19 and Co75(B,Si)25 Melts

Bel’tyukov¹,

Olyanina²,

Lad’yanov³

2021

HFIM

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The temperature (polytherms) and concentration (isotherms) dependences of the kinematic viscosity of melts of the ternary Co 81 (B,Si) 19 and Co 75 (B,Si) 25 systems have been experimentally studied. The polytherms of liquid alloys obtained in the heating and cooling regimes coincide and are well described by the exponential Arrhenius equation. The concentration dependences of the viscosity of ternary systems for the quasi-binary Co 81 B 19 -Co 81 Si 19 and Co 75 B 25 -Co 75 Si 25 sections at fixed temperatures were plotted using polytherms. For both systems, the extreme points on the viscosity isotherms corresponding to binary alloys have similar values at the same temperatures. The viscosity isotherms of the quasi-binary sections are close to the additive sum of the viscosity values of binary alloys with a small positive deviation. When the temperature of the melt changes the character of the viscosity isotherms does not change significantly. The calculations of the concentration dependences of the dynamic viscosity of the melts of the Сo 81 B 19 -Co 81 Si 19 and Сo 75 B 25 -Co 75 Si 25 systems were carried out according to the equations based on the data on the thermodynamic properties of the melt and/or the physical properties of its components. The calculations were carried out according to the following equations: Kozlov-Romanov-Petrov; Kaptay; Chhabra; Sato; Hirai; Budai-Benkö-Kaptay and Živković-(Budai-Benkö-Kaptay). For both ternary systems, the best agreement with the experimental data is shown by the Kozlov-Romanov-Petrov equation both in the nature of the isotherm and in the viscosity values. The maximum relative deviation of the viscosity isotherm calculated by the Kozlov-Romanov-Petrov equation from the isotherm obtained in the experiment does not exceed 15 %.

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