Properties Of Molten Metals Research Articles

Estimation of Smelting Efficacy and Properties of Molten Metal in Cupola Melting

Estimation of Smelting Efficacy and Properties of Molten Metal in Cupola Melting

Foreword for Special Issue on Melting of Cast Iron, Properties of Molten Metal and Biocoke for Cupola Melting

Foreword for Special Issue on Melting of Cast Iron, Properties of Molten Metal and Biocoke for Cupola Melting

In Situ Synchrotron Radiography and Spectrum Analysis of Transient Cavitation Bubbles in Molten Aluminium Alloy

The melt processing of conventional and advanced metallic materials with high-intensity ultrasonic vibrations significantly improves the quality and properties of molten metals during their solidification. These improvements are primarily attributed to ultrasonic cavitation: the creation, growth, pulsation, and collapse of bubbles in the liquid. However, the development of practical applications is limited by the lack of fundamental knowledge on the dynamics of the cavitation bubbles; it is very difficult to directly observe ultrasonic cavitation using conventional techniques in molten metals due their high temperature and opaqueness.In this study, an in situ synchrotron radiography experiment was performed to investigate bubble dynamics in an Al-10wt.% Cu alloy under an external ultrasound field at 30kHz. Radiographs with an exposure time of 78ms were collected continuously during the sonication of molten alloys at temperatures of 660±10°C. To the best of our knowledge, this is the first time that transient cavitation bubbles have been observed in liquid aluminium. Quantification of bubble parameters such as average size and time of collapse were evaluated from radiographs using advanced image analysis. Additionally, broadband noise associated with the acoustic emissions from shock waves of transient cavitation bubbles and estimation of the real-time acoustic pressure at the driving frequency were assessed using an advanced high-temperature cavitometer in separate bulk experiments.

Performance assessment of new perturbed hard-sphere equation of state for molten metals and ionic liquids: Application to pure and binary mixtures

This work addresses modeling the pressure–volume–temperature (PVT) properties of molten metals and ionic liquids (ILs) using a new perturbed hard-sphere equation of state (PHS EOS). Two temperature-dependent parameters appeared in the EOS, are correlated with two scaling constants σ and ε. Knowing these parameters, the proposed EOS is applied to these classes of liquids. The reliability of the proposed model is checked by comparing with 3177 experimental density data points. The average absolute deviations (AAD) of predicted densities of molten metals and ILs from literature data are found to be 1.35% and 0.56%, respectively. The extension of PHS EOS to binary metal alloys and IL+IL is also discussed. Generally, 609 data points for binary mixtures have been examined. The AAD of the predicted results are found to be 1.03%.

Al-Si 二元合金の流動性と溶湯の性状について

Al-Si 二元合金の流動性と溶湯の性状について

Thermophysical property measurements by electromagnetic levitation melting technique under microgravity.

The purpose of this paper is to review the advances in electromagnetic levitation techniques as tools for determination of the thermophysical properties of molten metals under standard gravity and microgravity conditions. We show that a combination of containerless processing and microgravity offers the exclusive possibility to measure critical thermophysical properties of molten metals, both above and below their melting points, over a wide temperature range, and with high accuracy.

V. N. Eremenko and the Development of Research into the Surface Properties of Molten Metals

The contribution of Academician V. N. Eremenko to the development of research into the surface properties of molten metals in the Ukraine is demonstrated. His name is connected with the methodical development of high-temperature methods for determining the surface characteristics of molten metals and alloys, obtaining a reliable mass of data about the surface properties of molten metals (including refractory and chemically active metals), and the study of temperature and concentration dependences of the surface properties of binary molten metals. The results are used in the physicochemical analysis of molten metals and development of ideas about the structure and properties of the surface layer at the melt-gas boundary.

Viscosity Measurements of Industrial Alloys Using the Oscillating Cup Technique

Molten metal processing can be effectively simulated using state-of-the-art computer algorithms, and manufacturers increasingly rely upon these tools to optimize the design of their operations. Reliable thermophysical properties of the solid, solid + liquid, and liquid phases are essential for effective computer simulation. Commercially available instruments can measure many of the required properties of molten metals (e.g., transformation temperatures, thermal conductivity, specific heat, latent heat, and density). However, there are no commercially available instruments to characterize several important thermophysical properties (e.g., emissivity, electrical resistivity, surface tension, and viscosity). Although the literature has numerous examples of measurements of surface tension using the sessile drop and the oscillating drop techniques, literature references are sparse with regard to measurements of emissivity, electrical resistivity, and viscosity. The present paper discusses the development of an oscillating cup viscometer and its application to characterizing the viscosity of fully molten industrial alloys. The theory behind the oscillating cup technique is reviewed, and the design details of the current instrument are discussed. In addition, experimental data of the viscosity of several nickel-based superalloys are presented.

金属融体のイオン間有効相互作用と物性

金属融体のイオン間有効相互作用と物性