Liquid metal

About: Liquid metal is a research topic. Over the lifetime, 6947 publications have been published within this topic receiving 77785 citations. The topic is also known as: liquid alloy & liquid metal alloy.

Simple Mean-Field Approach to Phase Separation in Liquid-Metal Alloys

Abstract: A mean-field theory of phase separation in liquid-metal alloys is described. The method satisfactorily accounts for the variation of critical concentration in alloys of simple metals, and also gives critical temperatures in reasonably good agreement with experiment. It predicts that under pressure the critical temperature should rise proportionally to the ionic number density. The theory leads to typical mean-field divergences in the x-ray scattering intensity, specific heat, and temperature derivative of the resistivity. The relation between the instability that causes such divergences and the "freezing instability" described by Schneider et al. is discussed.

Density Measurements on Levitated Liquid Metal Droplets

Abstract: Electromagnetic levitation is a useful tool for measuring thermophysical properties of high-temperature melts such as liquid metals. Due to its noncontact nature, the undercooled regime is also accessible. Density and thermal expansion of a levitated drop can be derived from volume measurements, if its mass is known. Assuming cylindrical symmetry, the volume of a drop can be determined from its cross section. Using photography, such measurements on liquid metals have been performed in the past. Here we present an improvement of this method, which replaces the photographic camera with a CCD videocamera and subsequent digital image processing. This reduces the time effect required to obtain the results and allows one to average over disturbing surface oscillations. The specific problems of digital image processing, namely resolution and edge detection, are addressed and results on nickel are presented.

Nozzle for strip casting

Abstract: A nozzle which can be used repeatedly for the supply of liquid metal is made up of individual, hollow, refractory sections fitted together side by side in a metal frame. The hollow elements of the nozzle may feature, in addition to at least one longitudinal channel for the supply of liquid metal, channels to accommodate heating elements also running in the longitudinal direction.

Numerical modeling and experimental verification of mold filling and evolved gas pressure in lost foam casting process

Abstract: A simple mathematical model is developed to describe a lost foam casting process. Different aspects of the process, such as liquid metal flow, transient heat transfer, foam degradation and gas elimination were incorporated into this numerical model. Fluid velocity, temperature distribution within molten metal and pressure building-up in the mold cavity are predicted as a function of filling time and filling height. The model was verified by comparison of the predicted velocity profiles, temperature fields and back-pressures with the experimental data conducted in this work. Both coated and uncoated foam patterns were used in experimental part of this study. A good agreement between the predictions and the experimental data was found.