Temperature dependence of interaction parameters for Al–Li liquid alloy

Abstract

ABSTRACT In the studies related to thermodynamic and structural functions of liquid alloys at high temperatures using linear temperature-dependent interaction parameters, in some cases, artificial miscibility gaps or artefacts are noticed. These artificial miscibility gaps in these functions at higher temperatures are usually asymmetric with respect to the concentration. The presence of the artificial miscibility gaps in the properties of the alloys at higher temperatures makes them less reliable and such data cannot be accepted at all. In the present work, we have computed thermodynamic and structural properties of liquid Al–Li alloy at temperatures 800, 1300 and 2000 K in the framework of Redlich–Kister (R-K) polynomials assuming interaction parameters to be linear temperature dependent and some artefacts were observed in these functions at around 2000 K. We have then obtained the optimised set of exponential temperature-dependent interaction parameters and computed the properties of the alloy again from the same polynomials where no miscibility gap was noticed at higher temperatures.