Prediction of Phase Diagrams in Nano-Sized Binary Alloys

Toshihiro Tanaka

doi:10.4028/www.scientific.net/msf.653.55

Abstract

The authors have evaluated the surface properties as well as phase diagrams of alloys on the basis of thermodynamic databases. Extending these techniques, we developed a new system to estimate phase equilibria of metals and alloys in small particle systems. The present paper describes our trial to evaluate the phase diagrams of binary alloys in nano-sized particle systems through thermodynamic databases.

Highlights

Various thermodynamic databases have been compiled to be mainly applied to the calculation of phase diagrams of alloys, salts and oxides [1]
The aim of the present paper is to investigate some fundamental issues on the application of thermodynamic databases to the evaluation of phase diagrams of nano-sized particles
We focus on binary alloy phase diagrams in nano-sized particle systems to know how liquidus curves change with the size of the particle, and how the thermodynamic interactions among the components, e.g. activity, excess Gibbs energy etc. affect the phase diagrams in nano particle systems of binary alloys

Summary

Introduction

Various thermodynamic databases have been compiled to be mainly applied to the calculation of phase diagrams of alloys, salts and oxides [1]. The authors have applied those thermodynamic databases to the evaluation of the surface tension of liquid alloys, molten ionic mixtures, molten slag and the interfacial tension between liquid steel and molten slag [3,4,5,6,7,8,9,10,11,12,13,14,15,16,17] These works are aimed to understand the thermodynamic properties of a material system including its surface or interface as well as the bulk. V are the molar volumes of pure element X in solid and liquid phases

Solid X

G Surface

SolV Sol