Density and Thermal Expansion of Liquid Ag–Cu and Ag–Au Alloys

Surface tension of liquid Ag-Cu binary alloys has been measured contactlessly using the technique of electromagnetic levitation in combination with the oscillating drop technique. The measurements were performed at temperatures above the melting point of alloys. The surface tension values were obtained from an analysis of the frequency spectra of droplet oscillations recorded with a CMOS-camera at 400 fps.The alloy samples covered the entire composition range. The surface tension data can be described by linear functions of temperature with negative slopes. The new experimental data were compared to the corresponding theoretical values calculated combining the Butler equation with the ideal and subregular solution models, respectively. The agreement with the experimentally obtained data is excellent for the isothermal surface tension and quite reasonable for their temperature coefficients.

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“…5) This observation can be associated with a close similarity of the two components, Ag and Cu, which are both in group Ib in the periodic 6)…”

Section: Introductionmentioning

confidence: 78%

“…The details of this procedure are described in. 5) In the present work, values for TL were obtained from the phase diagram reported in, 3) see Table 1. The frequencies of the droplet oscillations serve as a direct measure of the surface tension γ.…”

Section: Methodsmentioning

confidence: 99%

Surface Tension of Liquid Ag–Cu Binary Alloys

et al. 2014

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“…A literature survey shows there is good agreement between density data of different authors [5][6][7][8], but there is scatter in the surface tension data [6,[8][9][10][11][12]. A complex for investigations of high-temperature capillarity phenomena, developed in the Foundry Research Institute [13], has been recently used for accurate surface tension measurements of Sn [14] in the range of 523 K to 1023 K and AlTi-based alloys [15] at ∼2000 K.…”

Section: Introductionmentioning

confidence: 94%

Thermophysical Properties of Ag and Ag–Cu Liquid Alloys at 1098K to 1573K

Fima

Sobczak²

2010

Int J Thermophys

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The surface tension and density of liquid Ag and Ag-Cu alloys were measured with the sessile drop method. The sessile drop tests were carried out at temperatures from 1098 K to 1573 K, on cooling (temperature decreasing stepwise) under a protective atmosphere of high purity Ar (6N). The density of liquid Ag and Ag-Cu alloys decreases linearly with increasing temperature, and an increase in concentration of copper results in a lower density. The surface tension dependence on temperature can be described by linear equations, and the surface tension increases with increasing Cu content. The results of the measurements show good agreement with existing literature data and with thermodynamic calculations made using the Butler equation.

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“…Randomly oriented atoms in the simulation box were initially heated up to 2500 K and thermalized during 100 ps. Pressure, volume and temperature of each sample during quenching were monitored to reproduce experimental densities [37] at each temperature investigated (T = 1073, 1173, 1223, 1345 and 1523 K). Before structural and dynamic properties determination, each sample was thermalized during 20 ps and the final simulations were continued for 500 ps to determine structural and transport properties of liquid Al 1-x Cu x alloys investigated (x = 10, 30, 40 and 50 at% Cu).…”

Section: Molecular Dynamics Simulationsmentioning

confidence: 99%

Structure and chemistry of liquid Al–Cu alloys: molecular dynamics study versus thermodynamics-based modelling

2018

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Classical molecular dynamics simulations, employing a modified embedded atom model (MEAM) parametrization recently developed by Trybula, have been performed and combined with thermodynamics-based modelling for weakly interacting compound-forming molten alloys, to investigate the structure and chemistry of liquid Al-Cu alloys over a broad Cu concentration range. The compound-forming model (CFM) based on experimental thermodynamic data revealed the importance of the Al 2 Cu ''associate'' in the determination of transport properties such as diffusion and viscosity as well as confirmation of the compound formation ability with regard to the available experimental data. Adequately to this fact, molecular dynamics simulation results showed strong evidence of deviation from regular metallic solution resulting from a preponderance of chemical short-range ordering, expressed by Warren-Cowley parameter and increasing abundance of icosahedral motifs with increasing Cu content. In addition, their strong impact on mass transport properties as well as the excess entropy has been detected which exhibits nonlinear compositional behaviour. Thus, we find that the Stokes-Einstein relation is unsuitable for atom transport properties determination at investigated Cu concentration range, while the Green-Kubo formalism can fully account for the experimentally observed physical phenomena. We obtain a compact and compatible view onto the structure and chemical behaviour, including atom kinetics and thermodynamics, of Al-Cu liquid alloys, which allowed us to find another hard-spherelike metallic system in which transport properties and thermodynamics are strongly affected by packing effects. The hybrid approach presented herein gave a broader and deeper look into the liquid state of the Al-Cu alloys being missing in the literature.

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Density and Thermal Expansion of Liquid Ag–Cu and Ag–Au Alloys

Cited by 58 publications

References 7 publications

Surface Tension of Liquid Ag–Cu Binary Alloys

Surface Tension of Liquid Ag–Cu Binary Alloys

Thermophysical Properties of Ag and Ag–Cu Liquid Alloys at 1098K to 1573K

Structure and chemistry of liquid Al–Cu alloys: molecular dynamics study versus thermodynamics-based modelling

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