Determining Thermophysical Properties of Normal and Metastable Liquid Zr-Fe Alloys by Electrostatic Levitation Method

Zheng, Chenhui; Wang, H.P.; Zou, Peng; Hu, L.; Wei, B.

doi:10.1007/s11661-020-05820-2

Cited by 19 publications

(3 citation statements)

References 34 publications

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“…The densities of the samples were subsequently obtained by dividing the measured mass by the determined volume. The uncertainty of the density measurement originates from the measurement error of the sample volume, mass and temperature [25,26],…”

Section: Esl Experimentsmentioning

confidence: 99%

Thermophysical properties and atomic structure of liquid Zr–Nb alloys investigated by electrostatic levitation and molecular dynamics simulation

Zuo,

Chang,

Wang

et al. 2023

J. Phys.: Condens. Matter

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The investigation of the thermophysical properties of liquid Zr–Nb alloys holds great significance for theoretical research and technical application in liquid physics. However, the high temperatures involved make their experimental measurement challenging. In this study, the densities of liquid Zr-x wt.% Nb (x= 1.0, 2.5, 6.0) alloys were examined by electrostatic levitation and molecular dynamics calculation. Remarkably, the alloys achieved maximum undercooling of 335 K, 311 K and 326 K, respectively. Correspondingly, the densities are 6.20, 6.22 and 6.26 g·cm−3 at the liquidus temperatures (T L), respectively. The corresponding temperature coefficients are 2.61 × 10−4, 2.75 × 10−4 and 2.84 × 10−4 g·cm−3·K−1, respectively. Notably, the experimental density results align well with the simulated results. Moreover, the molar volume (V m), thermal expansion coefficient (α) and diffusion coefficient (D) were derived based on the experimental data and simulations. The thermal expansion coefficients reduce linearly with decreasing temperature. The analysis of the pair distribution function, coordination number (CN) and the radial distribution function reveals the temperature-dependent evolution of the atomic structure. The CN total and CN Zr–Zr initially increase and then decrease with decreasing temperature, while the change trends for CN Zr–Nb and CN Nb–Nb varied among the three alloys. The radial distribution function of three liquid alloys reveals that the atomic number density increases as the temperature drops. Additionally, the total diffusion coefficients decrease with the reduction of temperature and the rise of Nb content from 1.0 wt.% Nb to 6.0 wt.% Nb.

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Section: Esl Experimentsmentioning

confidence: 99%

Thermophysical properties and atomic structure of liquid Zr–Nb alloys investigated by electrostatic levitation and molecular dynamics simulation

Zuo,

Chang,

Wang

et al. 2023

J. Phys.: Condens. Matter

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“…[9] In most cases, the effect of hydrogen has been involved in the prepa-ration stage of metals, where the melts are quenched in the protective atmosphere composed of a small amount of hydrogen as reductant. [10,11] The effect of hydrogen doping on properties of supercooled glass-forming liquids therefore should be clarified first. In this work, we optimize the potential parameters of Cu/Zr/H system within the framework of modified embedded atomic method (MEAM).…”

Section: Introductionmentioning

confidence: 99%

Hydrogen-induced dynamic slowdown of metallic glass-forming liquids*

Gao¹,

Huang²,

Lü³

2021

Chinese Phys. B

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Dynamics of hydrogen doped Cu50Zr50 glass-forming liquids are investigated by using the newly developed modified embedded atomic method (MEAM) potential based on molecular dynamics simulations. We find that the doping of hydrogen atoms slows down the relaxation dynamics, reduces the fragility of supercooled melts, and promotes the occurrence of glass transitions. The dynamic slowdown is suggested to be closely related to the effect of hydrogen atoms on locally ordered structure of melts. With increasing concentration of hydrogen, the five-fold symmetry associated with Cu- and Zr-centered polyhedrons is lowered, on the other hand, the local order featuring metal hydrides is enhanced. The latter dominates the dynamic behaviors of glass-forming liquids, especially for Zr atoms, and results in the dynamic slowdown.

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“…To satisfy the condition of containerless processing, several levitation methods have been developed, such as aerodynamic levitation, [6,7] electrostatic levitation, [8,9] and electromagnetic levitation. [5,10,11] Levitation in ground-based equipment are facing the challenge that the positioning force must overcome the gravitational force.…”

Section: Introductionmentioning

confidence: 99%

Investigating Thermophysical Properties Under Microgravity: A Review

Mohr

Fecht

2020

Adv Eng Mater

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The advancement of metallic alloys is generally driven by alloy development, but furthermore requires the development of suitable production and processing routines. Almost all metallic products are formed through the solidification processing from the liquid phase. Although the solid-state is not influenced by gravitational effects, the processing of liquids is strongly impacted by earth's gravity-this influences interface phenomena, momentum, heat, and mass transport and, consequently, the solidification events. Experiments on liquid metallic alloys in microgravity avoid these influences and therefore allow benchmark experiments. This allows, for example, to obtain reliable thermophysical properties, improve the understanding of nucleation, phase selection, crystal growth, and other basic features of the liquid phase and the liquid-solid transition. The basic methodology, as well as a number of recent results obtained in the long-duration microgravity environment on board the international space station, are presented and discussed.

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Determining Thermophysical Properties of Normal and Metastable Liquid Zr-Fe Alloys by Electrostatic Levitation Method

Cited by 19 publications

References 34 publications

Thermophysical properties and atomic structure of liquid Zr–Nb alloys investigated by electrostatic levitation and molecular dynamics simulation

Thermophysical properties and atomic structure of liquid Zr–Nb alloys investigated by electrostatic levitation and molecular dynamics simulation

Hydrogen-induced dynamic slowdown of metallic glass-forming liquids*

Investigating Thermophysical Properties Under Microgravity: A Review

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