A unified model for the cohesive enthalpy, critical temperature, surface tension and volume thermal expansion coefficient of liquid metals of bcc, fcc and hcp crystals

Kaptay, George

doi:10.1016/j.msea.2007.10.112

Cited by 111 publications

(46 citation statements)

References 35 publications

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“…In this work, we have predicted the surface properties of the liquid alloys under consideration by correlating the thermodynamic properties with the modified Butler model (Bidai, Benko & Kaptay, 2005;Kaptay, 2008Kaptay, , 2015. According to modified Butler model, the surface tension ( ) of the liquid binary alloy of the type A−B, near the melting temperature can be given as (16a) where (i=A, B) represents the surface tension of the pure components, represents the molar surface area of components i in the pure liquid, represents the molar surface area of component i in the liquid solution.…”

Section: Surface Propertiesmentioning

confidence: 99%

“…However, the molar surface area of component in the pure liquid is equal to the molar surface area of the component in the liquid solution (i.e., ≈ ) (Kaptay, 2008). Under the consideration of the equilibrium between the surface and the bulk of the two components (i=A and j=B), the Equation (16a) can be expressed as (16b) where .…”

Section: Surface Propertiesmentioning

confidence: 99%

“…Surface Properties: 1. Surface Properties at T = 673 K The surface properties of the Tl−Na liquid alloy at 673 K have been analyzed by computing surface concentrations of the free monomers and surface tension of the alloy using modified Butler model (Kaptay, 2008(Kaptay, , 2015. The molar surface area of the constituents of the alloy ( and ) are estimated from Eq.…”

Section: Structural Properties At Different Temperaturesmentioning

confidence: 99%

“…Moreover, the study of the mixing behaviours of the initial melt at different temperatures experimentally have many constraints, such as difficulty in controlling temperatures, tedious, time consuming, high economical costs and developing new devices having high temperature and corrosion resistances. These difficulties have been to some extent resolved by theoretician by developing different modeling equations (Flory, 1942;Jordan, 1970;Bhatia & Hargrove, 1974;Lele & Ramchandrarao, 1981;Ruppersberg & Reiter, 1982;Hoshino, 1983;Young, 1992;Singh & Sommer, 1992;Budai, Benko & Kaptay, 2005;Kaptay, 2008Kaptay, , 2015Adhikari, Singh & Jha, 2010;Adhikari, 2011;Yadav, Jha & Adhikari, 2014) to study the mixing behaviours of the liquid alloys at the melting temperatures and interpolating/extrapolating these results at different elevated temperatures. In the light of such fundamental importance, we have extended regular associated solution model (Jordan, 1970;Lele & Ramchandrarao, 1981;Adhikar, Singh & Jha, 2010;Adhikari, 2011;Yadav, Jha & Adhikari, 2014) and employed it to predict the thermodynamic, structural and surface properties of the liquid Tl−Na alloys at higher temperatures (Yadav et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

“…In this work, we intend to predict the thermodynamic and structural properties of Tl−Na liquid alloys at higher temperatures 673 K, 773 K, 873 K and 973 K by assuming the complex at 673 K (Yadav, Jha & Adhikari, 2015) on the basis of extended regular associated solution model. The thermodynamic properties have been then correlated with the modified Butler model (Kaptay, 2008(Kaptay, , 2015Yadav et al, 2016) to predict the surface properties of the concerned system at different temperatures. The theory containing the different thermodynamic functions is presented in the Section 2, results and discussion is highlighted in the Section 3 and the conclusions are outlined in the Section 4.…”

Section: Introductionmentioning

confidence: 99%

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Theoretical Modeling to Predict the Thermodynamic, Structural, Surface and Transport Properties of the Liquid Tl−Na Alloys at different Temperatures

2017

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Theoretical modeling equations are developed by extending regular associated solution model to predict the thermodynamic and structural properties of the liquid Tl−Na alloys at higher temperatures. The thermodynamic properties have been predicted by computing activities of unassociated monomers ( and ) and free energy of mixing ( ) at temperatures 673 K, 773 K, 873 K and 973 K. The structural properties have been predicted by computing concentration fluctuation in long wavelength limit ( ), short range order parameter ( ) and ratio of mutual to intrinsic diffusion coefficients ( ) at aforementioned temperatures. These properties have been then correlated with the modified Butler's model to predict the surface properties, such as surface concentrations of free monomers ( and ) and surface tension ( ) of the alloy at above mentioned temperatures.

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Section: Surface Propertiesmentioning

confidence: 99%

Section: Surface Propertiesmentioning

confidence: 99%

Section: Structural Properties At Different Temperaturesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Theoretical Modeling to Predict the Thermodynamic, Structural, Surface and Transport Properties of the Liquid Tl−Na Alloys at different Temperatures

2017

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Imperfections of Kissinger Evaluation Method and the Explanation of Crystallization Kinetics of Glasses and Melts

Šesták

Holba

2017

Hot Topics in Thermal Analysis and Calorimetry

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Wettability and microstructural evolution of copper filler in W and EUROFER brazed joints

Izaguirre,

de Prado,

Sánchez

et al. 2024

Int J Adv Manuf Technol

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In terms of wettability, active systems are characterized by a reduction in interfacial energy as the time at specific conditions is increased. This article aims to investigate the evolution of wettability and microstructure, which undergoes a critical transformation at temperatures and dwell times near brazing conditions due to their significant impact on resultant mechanical properties. The objective is to enhance wettability and prevent the formation of different phases that can occur rapidly within the brazing window conditions. Up to 1105 °C, complete fusion of the filler does not occur. However, once it happens, the expansion of the copper filler in EUROFER increases up to 400%, and the contact angle reduces from 100° to 10°, indicating an active wetting behavior. On the other hand, when copper is used with tungsten, an inert behavior is observed, maintaining the contact angle around 70°. Brazed joints carried out under the most promising wetting conditions demonstrated that at 1110 °C-1 min, various phenomena began to occur. This includes solid-state diffusion of copper in the EUROFER, following the austenitic grain boundaries, and partial dissolution of Fe in the copper braze. Increasing the brazing time from 2 to 5 min achieved high interfacial adhesion properties and controlled the diffusion layer and Fe-rich band formed at the W-braze interface, resulting in the best mechanical results (295 MPa).

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A unified model for the cohesive enthalpy, critical temperature, surface tension and volume thermal expansion coefficient of liquid metals of bcc, fcc and hcp crystals

Cited by 111 publications

References 35 publications

Theoretical Modeling to Predict the Thermodynamic, Structural, Surface and Transport Properties of the Liquid Tl−Na Alloys at different Temperatures

Theoretical Modeling to Predict the Thermodynamic, Structural, Surface and Transport Properties of the Liquid Tl−Na Alloys at different Temperatures

Imperfections of Kissinger Evaluation Method and the Explanation of Crystallization Kinetics of Glasses and Melts

Wettability and microstructural evolution of copper filler in W and EUROFER brazed joints

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