Thermophysical Properties of Al-Ti Binary Liquid Alloys

Abstract

The present work reviews thermophysical property data such as density, surface tension, normal spectral emissivity, and molar heat capacity for liquid binary Al-Ti alloys measured by electromagnetic levitation (EML). The data are studied as functions of temperature and composition. In EML, forces generated by an inhomogeneous magnetic AC field stably position the specimen against gravity. Melting is achieved by inductive heating. Density (volume) is determined from the droplet's edge curve in the shadow graph profile. Surface tension is determined from the frequency spectrum of the time-dependent radius. Normal spectral emissivity is determined by a direct radiance method, and the laser modulation calorimetry methods is used for the determination of the molar heat capacity. The results are discussed on the basis of thermodynamic solution models, and the obtained excess properties are compared with each other. A great similarity is hereby found demonstrating the pronounced non-ideality of the Al-Ti system.