Origin of segregation in liquid metallic binary alloys | G. M. Bhuiyan | NCP21

The talk was delivered at the National Conference on Physics - 2021 (6 -7 August 2021) organized by Bangladesh Physical Society.

Title: Origin of segregation in liquid metallic binary alloys
Speaker: G. M. Bhuiyan
Affiliation: Department of Theoretical Physics, University of Dhaka, Bangladesh
Date: 06 August 2021

Abstract: A complete understanding of the basic mechanisms, from the point of inter ionic interaction, about how and why segregation in some metallic alloys occurs at and under certain thermodynamic state specified by temperature and pressure is far from over although several attempts have been made from the point of experiments and empirical theoretical models. In this talk we intend to address this issue from the point of microscopic theory that includes theory of metals, perturbation approach and the statistical mechanics. The theory of metals we have engaged here deals with the electron-ion and ion-ion interaction through a local pseudo potential model. The perturbative approach handles the procedure how thermodynamic quantities can be calculated effectively . The essential ingredient for this study is the knowledge of liquid structure which is derived by using the statistical mechanics involving the interionic interactions. Thermodynamics of mixing namely the energy of mixing, enthalpy of mixing and entropy of mixing are calculated at different temperatures for Al_{1-x}Bi_x binary alloys to dig out the cause of segregation. Finally a finishing touch is paid to the critical behaviours of segregation. Keywords: Segregation, Thermodynamics of mixing, Electronic theory of metals, Critical temperature and critical concentration, Perturbative approach.