Undercooling and solidification of Al-50 at. pct Si Alloy by electromagnetic levitation

Liu, R. P.; Herlach, D.M.; Vandyoussefi, M.; Greer, A.L.

doi:10.1007/s11661-004-0372-5

Cited by 37 publications

(11 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, it is not easy to obtain the thermal conductivity numerically from Eqs. (9) to (10), and the levitated melts observed had an oval shape, not a spherical one. Therefore, numerical simulations that account for deformation of a levitated melt were performed using the commercial software package FIDAP 8.6 [22], which is based on the finite element method.…”

Section: Analysis Of Periodic Heating Methods For Specimenmentioning

confidence: 88%

See 1 more Smart Citation

Density and Thermal Conductivity Measurements for Silicon Melt by Electromagnetic Levitation under a Static Magnetic Field

et al. 2007

View full text Add to dashboard Cite

The density and thermal conductivity of a high-purity silicon melt were measured over a wide temperature range including the undercooled regime by non-contact techniques accompanied with electromagnetic levitation (EML) under a homogeneous and static magnetic field. The maximum undercooling of 320 K for silicon was controlled by the residual impurity in the specimen, not by the melt motion or by contamination of the material. The temperature dependence of the measured density showed a linear relation for temperature as:where T m is the melting point of silicon. A periodic heating method with a CO 2 laser was adopted for the thermal conductivity measurement of the silicon melt. The measured thermal conductivity of the melt agreed roughly with values estimated by a Wiedemann-Franz law.

show abstract

Section: Analysis Of Periodic Heating Methods For Specimenmentioning

confidence: 88%

“…There are several techniques for containerless processing: gas-jet levitation [3], magnetic levitation [4,5], electrostatic levitation [6,7], and electromagnetic levitation (EML) [8,9]. For gas-jet levitation the gravitational force is balanced by the aerodynamic force of gas flow from the nozzle.…”

Section: Introductionmentioning

confidence: 99%

Density and Thermal Conductivity Measurements for Silicon Melt by Electromagnetic Levitation under a Static Magnetic Field

et al. 2007

View full text Add to dashboard Cite

show abstract

“…Discontinuity in load displacement, which is known as a 'pop-in' effect, was observed frequently in aluminium, indicating a process of producing mobile dislocations. The initial pop-in is usually associated with homogeneous dislocation nucleation, while subsequent similar events often involve avalanches of dislocation activity [14]. It is believed that the aluminium matrix in Al-Si cast alloys has some solubility for additional elements, which interact with the dislocation activity, leading to a plastic instability in the unloading curve.…”

Section: Aluminiummentioning

confidence: 99%

Mechanical properties of intermetallic phases in multi-component Al–Si alloys using nanoindentation

2009

View full text Add to dashboard Cite

“…In the past several decades, the specific heat and related thermodynamic properties of under-cooled metals, alloys and oxides have been investigated, by electromagnetic [7][8][9][10][11][12][13][14][15] and electrostatic [16,17] levitation, whose techniques can easily realize the deep under-cooling of melts. But the heat transmission in the process of levitation lacks accurate control and measurement, and the techniques can measure only the average specific heat of under-cooled melts, which does not accurately show the relation between specific heat and temperature.…”

mentioning

confidence: 99%

Thermodynamic properties of under-cooled silver melts

Zhu

Wang

et al. 2010

Sci. China Phys. Mech. Astron.

View full text Add to dashboard Cite

Differential scanning calorimeter technique combined with the traditional fluxing treatment was used to investigate the specific heat and related thermodynamic properties of under-cooled pure silver melts. The specific heat of the under-cooled melt showed a linear dependence on the temperature in the range of the obtained under-cooling from 0 to 198 K. The related thermodynamic properties of silver, such as the entropy change, the enthalpy change and the Gibbs free energy difference between the under-cooled melt and the solid phase, were derived from the measured specific heat. The relations between the temperature and the thermal diffusion or the thermal conductivity of the under-cooled melt were analyzed respectively. under-cooled silver melts, specific heat, thermodynamic propertiesSpecific heat and related thermodynamic properties of under-cooled liquid melts are very important parameters to further research on the mechanism of non-equilibrium solidification and formation of new metastable materials, and these properties are also essential for describing the nucleation and growth phenomena in under-cooling melts [1-6]. In the past several decades, the specific heat and related thermodynamic properties of under-cooled metals, alloys and oxides have been investigated, by electromagnetic [7-15] and electrostatic [16,17] levitation, whose techniques can easily realize the deep under-cooling of melts. But the heat transmission in the process of levitation lacks accurate control and measurement, and the techniques can measure only the average specific heat of under-cooled melts, which does not accurately show the relation between specific heat and temperature. During repeated melting and solidification, the sample in a suitable flux can be purified and the container wall effects on heterogeneous nucleation can be suppressed. As a result, deep under-cooling can be obtained [18,19]. When combined with the DSC technique, accurate measurement of the specific heat of the deeply under-cooled melts is realized [20][21][22][23].Studies on the measurement of the specific heat of deep under-cooled metal liquids and alloys have been reported recently [24][25][26][27][28], but the accurate experimental data on the specific heat and related thermodynamic properties of the under-cooled melts are still very scarce, for high-melting metals and alloys in the temperature range above 1200 K in particular. The recent literature covers only the measurements of some pure metals and simple binary alloys. In this paper, fluxing treatment is used within a DSC facility to investigate pure silver, a high-melting metal with the melting point temperature of 1233.6 K. The related thermodynamic properties including the enthalpy change, the entropy change, the Gibbs free energy difference, thermal diffusivity and thermal conductivity, are derived on the basis of the experimental results. And their temperature dependence is discussed, respectively. The experimental results are compared with several traditional approximate models based on different...

show abstract

Undercooling and solidification of Al-50 at. pct Si Alloy by electromagnetic levitation

Cited by 37 publications

References 25 publications

Density and Thermal Conductivity Measurements for Silicon Melt by Electromagnetic Levitation under a Static Magnetic Field

Density and Thermal Conductivity Measurements for Silicon Melt by Electromagnetic Levitation under a Static Magnetic Field

Mechanical properties of intermetallic phases in multi-component Al–Si alloys using nanoindentation

Thermodynamic properties of under-cooled silver melts

Contact Info

Product

Resources

About