Thermophysical properties of a highly superheated and undercooled Ni–Si alloy melt

Wang, H. P.; Cao, Chezheng; Wei, Baogang

doi:10.1063/1.1751618

Cited by 32 publications

(25 citation statements)

References 24 publications

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“…Since a static magnetic field of the order of several tesla can suppress surface oscillations and translational motions of a liquid droplet levitated electromagnetically, 13) this technique enables us to obtain accurate values of thermophysical properties such as thermal conductivity, heat capacity, [14][15][16][17] spectral emissivity, 16,17) surface tension, 18) and density. [19][20][21] Several reports have been published on the liquid density of the above-mentioned silicon alloys, [19][20][21][22][23][24] yet the range of composition covered is still inadequate to perform a systematic study and there is some remaining uncertainty concerning the absolute value and its temperature dependence. In addition, precise density values are essential to analyze structural data of liquid M-Si (M=Fe, Ni, and Ge) alloys, obtained from synchrotron x-ray diffraction experiments conducted by the present authors.…”

Section: Introductionmentioning

confidence: 99%

Concentration Dependence of Molar Volume of Binary Si Alloys in Liquid State

Mizuno¹,

Kawauchi²,

Tanno³

et al. 2014

ISIJ Int.

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The molar volumes of binary M-Si (M=Fe, Ni, and Ge) alloys in a liquid state were obtained from their densities measured using electromagnetic levitation coupled with a static magnetic field. We have systematically analyzed the molar volume as a function of composition. Although the concentration dependence of the molar volume of the liquid Ge-Si alloys obeys a linear law which is indicative of an ideal mixture, in comparison, that of the Ni-Si alloys shows a large discrepancy from the linear law as well as the Fe-Si system. The interaction between the constituent atoms was discussed with a view to analyzing the partial molar volume.

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Section: Introductionmentioning

confidence: 99%

Concentration Dependence of Molar Volume of Binary Si Alloys in Liquid State

Mizuno¹,

Kawauchi²,

Tanno³

et al. 2014

ISIJ Int.

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“…7 These models have been used to estimate the surface tension and viscosities of alloys where they could not be measured directly, 8 without testing the validity of extending them to multicomponent systems. These estimates for multicomponent systems may be misleading and this necessitates the experimental determination of reliable viscosity and surface tension data for alloys.…”

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confidence: 99%

Noncontact measurement of high-temperature surface tension and viscosity of bulk metallic glass-forming alloys using the drop oscillation technique

Mukherjee

Johnson

Rhim

2004

Applied Physics Letters

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High-temperature surface tension and viscosities for five bulk metallic glass-forming alloys with widely different glass-forming abilities are measured. The measurements are carried out in a high-vacuum electrostatic levitator using the drop oscillation technique. The surface tension follows proportional mathematical addition of pure components' surface tension except when some of the constituent elements have much lower surface tension. In such cases, there is surface segregation of the low surface tension elements. These alloys are found to have orders of magnitude higher viscosity at their melting points compared to the constituent metals. Among the bulk glass-forming alloys, the better glass former has a higher melting-temperature viscosity, which demonstrates that high-temperature viscosity has a pronounced influence on glass-forming ability. Correlations between surface tension and viscosity are also investigated. In recent years, several metallic alloys have been discovered, typically close to eutectic compositions, which can be cast in bulk amorphous form even with cooling rates as low as 1 K/s. [1][2][3][4] Their unique mechanical properties such as high strength, elastic strain limit, and high fatigue resistance make them interesting as engineering materials.3-5 It is of great interest to investigate the role of thermophysical properties of these alloys in determining their glass-forming behavior both from the scientific point of view as well as industrial processes like casting and composite infiltration. Surface tension and viscosity of liquids are two important thermophysical properties which determine their surface and bulk characteristics, respectively. Viscosity is a kinetic parameter that determines the nucleation and growth rates of crystals in the undercooled liquid, while knowledge of surface tension of alloys is vital for studying surface segregation effects and the extent of Marangoni flow. 6 Although surface tension and viscosity data for pure metals are available in literature, 7 they are scarce for binary systems and in the case of complex glass-forming alloys a nearly complete lack of data is evident. Data are lacking especially at high temperatures because these glass-forming systems consist of highly reactive elements such as Ni, Ti, and Zr, which limit the applicability of conventional methods 7 to measure surface tension and viscosity.Containerless measurement techniques for surface tension and viscosity are advantageous over conventional methods because they isolate the samples from container walls thereby preventing any chemical reaction. Particularly, the drop oscillation technique used in a high-vacuum electrostatic levitator (ESL) has numerous advantages over other levitation methods: (i) the sample surface is protected because of high vacuum environment, (ii) both the surface tension and viscosity can be obtained from a single transient signal thereby eliminating uncertainties introduced from different measurement techniques, and (iii) a single axisymmetric mode can be excited...

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“…Thermophysical properties of liquid metals and alloys are very important data for liquid physics and solidification theoretical models, which have aroused great research interest in recent years [1][2][3][4][5][6][7][8][9] . Due to the metastable state of undercooled liquid, few experimental studies on thermophysical properties of highly undercooled liquid alloys have been carried out, which causes the serious scarcity of experimental data and restricts the development of solidification theory and computational materials science.…”

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Thermophysical properties of Ni-5%Sn alloy melt

2006

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The surface tension and specific heat of Ni-5%Sn alloy melt were measured by the oscillating drop method and the drop calorimetric method using electromagnetic levitation, respectively. The temperature coefficient of surface tension is 6.43×10 -4 N·m −1 K −1 within the temperature regime of 1464-1931 K. The enthalpy change was measured in the temperature range from 1461 to 1986 K, and the average specific heat was obtained as 43.03 J·mol −1 K −1 . Some other thermophysical properties, such as viscosity, solute diffusion coefficient, density, thermal diffusivity and thermal conductivity of this alloy melt, were derived based on the experimentally measured surface tension and specific heat. Using these thermophysical parameters, the relation between solute trapping and undercooling in rapidly solidified α-Ni was calculated, and the theoretical prediction shows a good agreement with experimental data.

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Thermophysical properties of a highly superheated and undercooled Ni–Si alloy melt

Cited by 32 publications

References 24 publications

Concentration Dependence of Molar Volume of Binary Si Alloys in Liquid State

Concentration Dependence of Molar Volume of Binary Si Alloys in Liquid State

Noncontact measurement of high-temperature surface tension and viscosity of bulk metallic glass-forming alloys using the drop oscillation technique

Thermophysical properties of Ni-5%Sn alloy melt

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