Thermodynamic modeling of the solidification path of levitated Fe–Co alloys

Rodriguez, Justin E.; Matson, Douglas M.

doi:10.1016/j.calphad.2015.03.001

Cited by 17 publications

(7 citation statements)

References 25 publications

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“…[15] It is also confirmed from the Fe-Co equilibrium phase diagram that this system has very little solute segregation. [16] The R-squared values for both EML and ESL are 0.993 and 0.998, respectively, whereas data measured by MBP method show 0.978. In order to statistically compare the precision between the EML and ESL methods, the standard deviation of each data point from the fitted linear function was estimated for individual measurement.…”

Section: Resultsmentioning

confidence: 99%

Measurement of Density of Fe-Co Alloys Using Electrostatic Levitation

Lee

Rodriguez

Hyers

et al. 2015

Metall Mater Trans B

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The density of a series of five different iron-cobalt alloys was measured using electrostatic levitator processing. Each sample was processed through multiple thermal cycles and the liquid density was measured, while the superheated sample was cooled down to its undercooled state. The volume of the sample was estimated by analyzing captured high-speed video data of the projected shape of the sample. The mass change during the melt cycle was also tracked using Langmuir's equation of mass evaporation. The density was then calculated as a function of temperature based on these measurements of volume and mass. Density values obtained showed higher precision than existing data from the literature obtained using a variety of different techniques, although the accuracy was consistent.

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Section: Resultsmentioning

confidence: 99%

Measurement of Density of Fe-Co Alloys Using Electrostatic Levitation

Lee

Rodriguez

Hyers

et al. 2015

Metall Mater Trans B

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“…5b the measured delay times plotted versus are well described by the model in a wide range predicting an undercooling dependency according to . The nearly parallel curves are shifted towards shorter delay times with increasing Co concentration, which is mainly due to the larger temperature interval according to the phase diagram 47 and, therefore, to an increased Gibbs free energy difference acting as the thermodynamic driving force for phase transformation. As growth kinetics and pattern formation are generally influenced by fluid flow 48 the model also involves convection effects since the delay time explicitly depends on growth velocity and dendrite tip radius.…”

Section: Recent Achievementsmentioning

confidence: 94%

Electromagnetic levitation containerless processing of metallic materials in microgravity: rapid solidification

et al. 2023

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Space levitation processing allows researchers to conduct benchmark tests in an effort to understand the physical phenomena involved in rapid solidification processing, including alloy thermodynamics, nucleation and growth, heat and mass transfer, solid/liquid interface dynamics, macro- and microstructural evolution, and defect formation. Supported by ground-based investigations, a major thrust is to develop and refine robust computational tools based on theoretical and applied approaches. This work is accomplished in conjunction with experiments designed for precise model validation with application to a broad range of industrial processes.

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“…4 that the obtained values of c 1 and c 2 at temperatures T  650 K show further changes as temperature increases. This behaviour can be caused by the change in crystalline structure of the Co-Fe alloy from hcp to fcc, which occurs at about 700 K [24].…”

Section: The Freezing Temperature T D For Atoms In the Dilute Co-fe Amentioning

confidence: 99%

“…In particular, these alloys are used in the production of turbine engine components, transformers, magnetic bearings and recording heads [1][2][3][4][5]. At the same time, this system is regarded as a model for experimental and theoretical studies of thermodynamic properties [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic properties of dilute Co-Fe solid solutions studied by ⁵⁷Fe Mössbauer spectroscopy

Konieczny

Idczak

2017

Nukleonika

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Abstract. The Co 1-x Fe x alloys where x ranges from 0.01 to 0.06 were measured at room temperature using transmission Mössbauer spectroscopy (TMS). The analysis of the obtained data allowed the determination of the short-range order (SRO), the binding energy E b between two iron atoms in the studied materials using the extended Hrynkiewicz-Królas idea and the enthalpy of solution H Co-Fe of Fe in Co. The results showed that the Fe atoms dissolved in a Co matrix interact repulsively and the estimated value of H Co-Fe = -0.166(33) eV/atom. Finally, values of the enthalpy of solution were used to predict the enthalpy of mixing for the Co-Fe system. These fi ndings were compared with corresponding data given in the literature, which were derived from calorimetric experiments and from the cellular atomic model of alloys described by Miedema.

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Thermodynamic modeling of the solidification path of levitated Fe–Co alloys

Cited by 17 publications

References 25 publications

Measurement of Density of Fe-Co Alloys Using Electrostatic Levitation

Measurement of Density of Fe-Co Alloys Using Electrostatic Levitation

Electromagnetic levitation containerless processing of metallic materials in microgravity: rapid solidification

Thermodynamic properties of dilute Co-Fe solid solutions studied by ⁵⁷Fe Mössbauer spectroscopy

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Thermodynamic modeling of the solidification path of levitated Fe–Co alloys

Cited by 17 publications

References 25 publications

Measurement of Density of Fe-Co Alloys Using Electrostatic Levitation

Measurement of Density of Fe-Co Alloys Using Electrostatic Levitation

Electromagnetic levitation containerless processing of metallic materials in microgravity: rapid solidification

Thermodynamic properties of dilute Co-Fe solid solutions studied by 57Fe Mössbauer spectroscopy

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Thermodynamic properties of dilute Co-Fe solid solutions studied by ⁵⁷Fe Mössbauer spectroscopy